diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index c020f04d1..73d98faad 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -24,6 +24,10 @@
       PARTIAL_FLAG = 32,
       PARTIAL_RIGHT_FLAG = 64;
 
+  /** Used to detect when a function becomes hot */
+  var HOT_COUNT = 150,
+      HOT_SPAN = 16;
+
   /** Used as the property name for wrapper metadata */
   var EXPANDO = '__lodash_' + VERSION.replace(/[-.]/g, '_') + '__';
 
@@ -122,7 +126,8 @@
     'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Math', 'Number',
     'Object', 'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document',
     'isFinite', 'parseInt', 'setTimeout', 'TypeError', 'Uint8Array',
-    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'window', 'WinRTError'
+    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
+    'window', 'WinRTError'
   ];
 
   /** Used to fix the JScript `[[DontEnum]]` bug */
@@ -208,7 +213,7 @@
   /**
    * Used to convert characters to HTML entities.
    *
-   * Note: Though the ">" character is escaped for symmetry, characters like
+   * **Note:** Though the ">" character is escaped for symmetry, characters like
    * ">" and "/" don't require escaping in HTML and have no special meaning
    * unless they're part of a tag or unquoted attribute value.
    * See [Mathias' article](http://mathiasbynens.be/notes/ambiguous-ampersands)
@@ -351,16 +356,37 @@
    */
   function baseIndexOf(array, value, fromIndex) {
     var index = (fromIndex || 0) - 1,
-        length = array ? array.length : 0;
+        length = array ? array.length : 0,
+        isReflexive = value === value;
 
     while (++index < length) {
-      if (array[index] === value) {
+      var other = array[index];
+      if ((isReflexive ? other === value : other !== other)) {
         return index;
       }
     }
     return -1;
   }
 
+  /**
+   * The base implementation of `_.slice` without support for `start` and `end`
+   * arguments.
+   *
+   * @private
+   * @param {Array} array The array to slice.
+   * @returns {Array} Returns the slice of `array`.
+   */
+  function baseSlice(array) {
+    var index = -1,
+        length = array ? array.length : 0,
+        result = Array(length);
+
+    while (++index < length) {
+      result[index] = array[index];
+    }
+    return result;
+  }
+
   /**
    * An implementation of `_.contains` for cache objects that mimics the return
    * signature of `_.indexOf` by returning `0` if the value is found, else `-1`.
@@ -399,7 +425,7 @@
     var index = -1,
         length = string.length;
 
-    while (++index < length && chars.indexOf(string.charAt(index)) > -1) { }
+    while (++index < length && chars.indexOf(string.charAt(index)) > -1) {}
     return index;
   }
 
@@ -415,7 +441,7 @@
   function charsRightIndex(string, chars) {
     var index = string.length;
 
-    while (index-- && chars.indexOf(string.charAt(index)) > -1) { }
+    while (index-- && chars.indexOf(string.charAt(index)) > -1) {}
     return index;
   }
 
@@ -519,19 +545,6 @@
     return '\\' + stringEscapes[chr];
   }
 
-  /**
-   * Checks if `value` is a DOM node in IE < 9.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a DOM node, else `false`.
-   */
-  function isNode(value) {
-    // IE < 9 presents DOM nodes as `Object` objects except they have `toString`
-    // methods that are `typeof` "string" and still can coerce nodes to strings
-    return typeof value.toString != 'function' && typeof (value + '') == 'string';
-  }
-
   /**
    * Used by `_.trimmedLeftIndex` and `_.trimmedRightIndex` to determine if a
    * character code is whitespace.
@@ -557,7 +570,7 @@
     var index = -1,
         length = string.length;
 
-    while (++index < length && isWhitespace(string.charCodeAt(index))) { }
+    while (++index < length && isWhitespace(string.charCodeAt(index))) {}
     return index;
   }
 
@@ -572,7 +585,7 @@
   function trimmedRightIndex(string) {
     var index = string.length;
 
-    while (index-- && isWhitespace(string.charCodeAt(index))) { }
+    while (index-- && isWhitespace(string.charCodeAt(index))) {}
     return index;
   }
 
@@ -647,6 +660,9 @@
     /** Used to resolve the decompiled source of functions */
     var fnToString = Function.prototype.toString;
 
+    /** Used to check objects for own properties */
+    var hasOwnProperty = objectProto.hasOwnProperty;
+
     /** Used to restore the original `_` reference in `_.noConflict` */
     var oldDash = context._;
 
@@ -666,13 +682,13 @@
         clearTimeout = context.clearTimeout,
         floor = Math.floor,
         getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
-        hasOwnProperty = objectProto.hasOwnProperty,
         push = arrayProto.push,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
         Set = isNative(Set = context.Set) && Set,
         setTimeout = context.setTimeout,
         splice = arrayProto.splice,
-        Uint8Array = isNative(Uint8Array = context.Uint8Array) && Uint8Array;
+        Uint8Array = isNative(Uint8Array = context.Uint8Array) && Uint8Array,
+        WeakMap = isNative(WeakMap = context.WeakMap) && WeakMap;
 
     /** Used to clone array buffers */
     var Float64Array = (function() {
@@ -682,7 +698,7 @@
       try {
         var func = isNative(func = context.Float64Array) && func,
             result = new func(new ArrayBuffer(10), 0, 1) && func;
-      } catch(e) { }
+      } catch(e) {}
       return result;
     }());
 
@@ -693,13 +709,12 @@
         var o = {},
             func = isNative(func = Object.defineProperty) && func,
             result = func(o, o, o) && func;
-      } catch(e) { }
+      } catch(e) {}
       return result;
     }());
 
     /* Native method references for those with the same name as other `lodash` methods */
-    var nativeContains = isNative(nativeContains = stringProto.contains) && nativeContains,
-        nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
+    var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
         nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
         nativeIsFinite = context.isFinite,
         nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
@@ -713,6 +728,9 @@
     /** Used as the size, in bytes, of each Float64Array element */
     var FLOAT64_BYTES_PER_ELEMENT = Float64Array ? Float64Array.BYTES_PER_ELEMENT : 0;
 
+    /** Used to store function metadata */
+    var metaMap = WeakMap && new WeakMap;
+
     /** Used to lookup a built-in constructor by [[Class]] */
     var ctorByClass = {};
     ctorByClass[float32Class] = context.Float32Array;
@@ -772,17 +790,17 @@
      *
      * The non-chainable wrapper functions are:
      * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `contains`,
-     * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`,
-     * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`,
-     * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, isDate`,
+     * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`,
+     * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`,
+     * `has`, `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, isDate`,
      * `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`, `isFunction`,
-     * `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`,
-     * `isString`, `isUndefined`, `join`, `kebabCase`, `last`, `lastIndexOf`,
-     * `max`, `min`, `noConflict`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`,
-     * `pop`, `random`, `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`,
-     * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`,
-     * `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`,
-     * `unescape`, `uniqueId`, and `value`
+     * `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`,
+     * `isRegExp`, `isString`, `isUndefined`, `join`, `kebabCase`, `last`,
+     * `lastIndexOf`, `max`, `min`, `noConflict`, `now`, `pad`, `padLeft`,
+     * `padRight`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, `repeat`,
+     * `result`, `runInContext`, `shift`, `size`, `snakeCase`, `some`, `sortedIndex`,
+     * `sortedLastIndex`, `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`,
+     * `trunc`, `unescape`, `uniqueId`, and `value`
      *
      * The wrapper function `sample` will return a wrapped value when `n` is
      * provided, otherwise it will return an unwrapped value.
@@ -852,8 +870,6 @@
 
       Ctor.prototype = { 'valueOf': 1, 'y': 1 };
       for (var key in new Ctor) { props.push(key); }
-      for (var argsKey in arguments) { }
-      for (var strKey in 'x') { }
 
       /**
        * Detect if the `[[Class]]` of `arguments` objects is resolvable
@@ -912,7 +928,7 @@
        * @memberOf _.support
        * @type boolean
        */
-      support.nonEnumStrings = strKey != '0';
+      support.nonEnumStrings = !propertyIsEnumerable.call('x', 0);
 
       /**
        * Detect if properties shadowing those on `Object.prototype` are
@@ -975,19 +991,25 @@
       }
 
       /**
-       * Detect if the `[[Class]]` of DOM nodes is resolvable (all but IE < 9)
-       * and that the JS engine errors when attempting to coerce an object to a
-       * string without a `toString` function.
+       * Detect if the host objects are detectable (IE < 9).
        *
        * @memberOf _.support
        * @type boolean
        */
       try {
-        support.nodeClass = !(toString.call(document) == objectClass && !({ 'toString': 0 } + ''));
+        support.hostObject = !({ 'toString': 0 } + '');
       } catch(e) {
-        support.nodeClass = true;
+        support.hostObject = false;
       }
 
+      /**
+       * Detect if the `[[Class]]` of DOM nodes is resolvable (all but IE < 9).
+       *
+       * @memberOf _.support
+       * @type boolean
+       */
+      support.nodeClass = !(toString.call(document) == objectClass && support.hostObject);
+
       /**
        * Detect if `arguments` object indexes are non-enumerable.
        *
@@ -1001,7 +1023,7 @@
        * @type boolean
        */
       try {
-        support.nonEnumArgs = !(hasOwnProperty.call(arguments, 1) && propertyIsEnumerable.call(arguments, 1));
+        support.nonEnumArgs = !propertyIsEnumerable.call(arguments, 1);
       } catch(e) {
         support.nonEnumArgs = true;
       }
@@ -1076,15 +1098,15 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns `array`.
      */
-    function arrayEach(array, iterator) {
+    function arrayEach(array, iteratee) {
       var index = -1,
           length = array.length;
 
       while (++index < length) {
-        if (iterator(array[index], index, array) === false) {
+        if (iteratee(array[index], index, array) === false) {
           break;
         }
       }
@@ -1097,14 +1119,14 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns `array`.
      */
-    function arrayEachRight(array, iterator) {
+    function arrayEachRight(array, iteratee) {
       var length = array.length;
 
       while (length--) {
-        if (iterator(array[length], length, array) === false) {
+        if (iteratee(array[length], length, array) === false) {
           break;
         }
       }
@@ -1139,16 +1161,16 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns the new mapped array.
      */
-    function arrayMap(array, iterator) {
+    function arrayMap(array, iteratee) {
       var index = -1,
           length = array.length,
           result = Array(length);
 
       while (++index < length) {
-        result[index] = iterator(array[index], index, array);
+        result[index] = iteratee(array[index], index, array);
       }
       return result;
     }
@@ -1165,12 +1187,13 @@
     function arrayFilter(array, predicate) {
       var index = -1,
           length = array.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         var value = array[index];
         if (predicate(value, index, array)) {
-          result.push(value);
+          result[++resIndex] = value;
         }
       }
       return result;
@@ -1182,13 +1205,13 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {*} [accumulator] The initial value.
      * @param {boolean} [initFromArray=false] Specify using the first element of
      *  `array` as the initial value.
      * @returns {*} Returns the accumulated value.
      */
-    function arrayReduce(array, iterator, accumulator, initFromArray) {
+    function arrayReduce(array, iteratee, accumulator, initFromArray) {
       var index = -1,
           length = array.length;
 
@@ -1196,7 +1219,7 @@
         accumulator = array[++index];
       }
       while (++index < length) {
-        accumulator = iterator(accumulator, array[index], index, array);
+        accumulator = iteratee(accumulator, array[index], index, array);
       }
       return accumulator;
     }
@@ -1207,20 +1230,20 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {*} [accumulator] The initial value.
      * @param {boolean} [initFromArray=false] Specify using the last element of
      *  `array` as the initial value.
      * @returns {*} Returns the accumulated value.
      */
-    function arrayReduceRight(array, iterator, accumulator, initFromArray) {
+    function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
       var length = array.length;
 
       if (initFromArray && length) {
         accumulator = array[--length];
       }
       while (length--) {
-        accumulator = iterator(accumulator, array[length], length, array);
+        accumulator = iteratee(accumulator, array[length], length, array);
       }
       return accumulator;
     }
@@ -1264,7 +1287,7 @@
     /**
      * Used by `_.template` to customize its `_.assign` use.
      *
-     * Note: This method is like `assignDefaults` except that it ignores
+     * **Note:** This method is like `assignDefaults` except that it ignores
      * inherited property values when checking if a property is `undefined`.
      *
      * @private
@@ -1319,7 +1342,7 @@
 
       while (++index < length) {
         var key = methodNames[index];
-        object[key] = createWrapper([object[key], BIND_FLAG, null, object]);
+        object[key] = createWrapper(object[key], BIND_FLAG, null, object);
       }
       return object;
     }
@@ -1341,7 +1364,7 @@
         if (typeof thisArg == 'undefined') {
           return func;
         }
-        var data = func[EXPANDO];
+        var data = getData(func);
         if (typeof data == 'undefined') {
           if (support.funcNames) {
             data = !func.name;
@@ -1355,7 +1378,7 @@
             if (!data) {
               // checks if `func` references the `this` keyword and stores the result
               data = reThis.test(source) || isNative(func);
-              setData(func, data);
+              baseSetData(func, data);
             }
           }
         }
@@ -1405,79 +1428,15 @@
       if (typeof result != 'undefined') {
         return result;
       }
-      var isArr = isArray(value),
-          isShallow = !isDeep;
-
+      var isArr = isArray(value);
+      result = value;
       if (isArr) {
-        result = isShallow ? slice(value) : value.constructor(value.length);
-
-        // add array properties assigned by `RegExp#exec`
-        if (typeof value[0] == 'string' && hasOwnProperty.call(value, 'index')) {
-          result.index = value.index;
-          result.input = value.input;
-        }
-        if (isShallow) {
-          return result;
-        }
+        result = initArrayClone(value, isDeep);
+      } else if (isObject(value)) {
+        result = initObjectClone(value, isDeep);
+        value = (isDeep && toString.call(result) == objectClass) ? value : result;
       }
-      else {
-        if (!isObject(value)) {
-          return value;
-        }
-        var className = toString.call(value);
-        if (!cloneableClasses[className] || (!support.nodeClass && isNode(value))) {
-          return value;
-        }
-        var isArgs = className == argsClass || (!support.argsClass && isArguments(value)),
-            isObj = !isArgs && className == objectClass;
-
-        if (isShallow && (isArgs || isObj)) {
-          result = baseAssign({}, value);
-          if (isObj) {
-            return result;
-          }
-        }
-        var Ctor = value.constructor;
-        if (className == objectClass && !(isFunction(Ctor) && (Ctor instanceof Ctor))) {
-          Ctor = Object;
-        }
-        if (isDeep && (isArgs || isObj)) {
-          result = new Ctor;
-        }
-        else {
-          switch (className) {
-            case arrayBufferClass:
-              return cloneBuffer(value);
-
-            case boolClass:
-            case dateClass:
-              return new Ctor(+value);
-
-            case float32Class: case float64Class:
-            case int8Class: case int16Class: case int32Class:
-            case uint8Class: case uint8ClampedClass: case uint16Class: case uint32Class:
-              // Safari 5 mobile incorrectly has `Object` as the constructor
-              if (Ctor instanceof Ctor) {
-                Ctor = ctorByClass[className];
-              }
-              var buffer = value.buffer;
-              return new Ctor(isDeep ? cloneBuffer(buffer) : buffer, value.byteOffset, value.length);
-
-            case numberClass:
-            case stringClass:
-              return new Ctor(value);
-
-            case regexpClass:
-              result = Ctor(value.source, reFlags.exec(value));
-              result.lastIndex = value.lastIndex;
-              return result;
-          }
-        }
-      }
-      if (isArgs) {
-        result.length = value.length;
-      }
-      if (isShallow) {
+      if (!isDeep || result === value) {
         return result;
       }
       // check for circular references and return corresponding clone
@@ -1532,85 +1491,6 @@
       }());
     }
 
-    /**
-     * The base implementation of `createWrapper` which creates the wrapper and
-     * sets its metadata.
-     *
-     * @private
-     * @param {Array} data The metadata array. See `createWrapper` for more details.
-     * @returns {Function} Returns the new function.
-     */
-    function baseCreateWrapper(data) {
-      var bitmask = data[1];
-      if (bitmask == BIND_FLAG) {
-        return setData(createBindWrapper(data), data);
-      }
-      var partialHolders = data[5];
-      if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !partialHolders.length) {
-        return setData(createPartialWrapper(data), data);
-      }
-      var func = data[0],
-          arity = data[2],
-          thisArg = data[3],
-          partialArgs = data[4],
-          partialRightArgs = data[6],
-          partialRightHolders = data[7];
-
-      var isBind = bitmask & BIND_FLAG,
-          isBindKey = bitmask & BIND_KEY_FLAG,
-          isCurry = bitmask & CURRY_FLAG,
-          isCurryRight = bitmask & CURRY_RIGHT_FLAG,
-          isCurryBound = bitmask & CURRY_BOUND_FLAG;
-
-      var Ctor = !isBindKey && createCtorWrapper(func),
-          key = func;
-
-      var wrapper = function() {
-        var length = arguments.length,
-            index = length,
-            args = Array(length);
-
-        while (index--) {
-          args[index] = arguments[index];
-        }
-        if (partialArgs) {
-          args = composeArgs(partialArgs, partialHolders, args);
-        }
-        if (partialRightArgs) {
-          args = composeArgsRight(partialRightArgs, partialRightHolders, args);
-        }
-        if (isCurry || isCurryRight) {
-          var placeholder = wrapper.placeholder,
-              newPartialHolders = replaceHolders(args, placeholder);
-
-          length -= newPartialHolders.length;
-
-          if (length < arity) {
-            bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG);
-            bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG);
-
-            if (!isCurryBound) {
-              bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
-            }
-            var newData = [func, bitmask, nativeMax(arity - length, 0), thisArg, null, null];
-            newData[isCurry ? 4 : 6] = args;
-            newData[isCurry ? 5 : 7] = newPartialHolders;
-
-            var result = baseCreateWrapper(newData);
-            result.placeholder = placeholder;
-            return result;
-          }
-        }
-        var thisBinding = isBind ? thisArg : this;
-        if (isBindKey) {
-          func = thisBinding[key];
-        }
-        return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
-      };
-
-      return setData(wrapper, data);
-    }
-
     /**
      * The base implementation of `_.curry` and `_.curryRight` which handles
      * resolving the default arity of `func`.
@@ -1623,9 +1503,9 @@
      */
     function baseCurry(func, bitmask, arity) {
       if (typeof arity != 'number') {
-        arity = +arity || (func ? func.length : 0);
+        arity = arity == null ? (func ? func.length : 0) : nativeMax(+arity || 0, 0);
       }
-      return createWrapper([func, bitmask, arity]);
+      return createWrapper(func, bitmask, arity);
     }
 
     /**
@@ -1658,7 +1538,7 @@
       while (++index < length) {
         var value = array[index];
 
-        if (isCommon) {
+        if (isCommon && value === value) {
           var valuesIndex = valuesLength;
           while (valuesIndex--) {
             if (values[valuesIndex] === value) {
@@ -1680,19 +1560,19 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array|Object|string} Returns `collection`.
      */
-    function baseEach(collection, iterator) {
+    function baseEach(collection, iteratee) {
       var length = collection ? collection.length : 0;
       if (!(typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER)) {
-        return baseForOwn(collection, iterator);
+        return baseForOwn(collection, iteratee);
       }
       var index = -1,
           iterable = toIterable(collection);
 
       while (++index < length) {
-        if (iterator(iterable[index], index, iterable) === false) {
+        if (iteratee(iterable[index], index, iterable) === false) {
           break;
         }
       }
@@ -1705,17 +1585,17 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array|Object|string} Returns `collection`.
      */
-    function baseEachRight(collection, iterator) {
+    function baseEachRight(collection, iteratee) {
       var length = collection ? collection.length : 0;
       if (!(typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER)) {
-        return baseForOwnRight(collection, iterator);
+        return baseForOwnRight(collection, iteratee);
       }
       var iterable = toIterable(collection);
       while (length--) {
-        if (iterator(iterable[length], length, iterable) === false) {
+        if (iteratee(iterable[length], length, iterable) === false) {
           break;
         }
       }
@@ -1829,24 +1709,24 @@
 
     /**
      * The base implementation of `baseForIn` and `baseForOwn` which iterates
-     * over `object` properties returned by `keysFunc` executing `iterator` for
+     * over `object` properties returned by `keysFunc` executing `iteratee` for
      * each property. Iterator functions may exit iteration early by explicitly
      * returning `false`.
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {Function} keysFunc The function to get the keys of `object`.
      * @returns {Object} Returns `object`.
      */
-    function baseFor(object, iterator, keysFunc) {
+    function baseFor(object, iteratee, keysFunc) {
       var index = -1,
           props = keysFunc(object),
           length = props.length;
 
       while (++index < length) {
         var key = props[index];
-        if (iterator(object[key], key, object) === false) {
+        if (iteratee(object[key], key, object) === false) {
           break;
         }
       }
@@ -1859,17 +1739,17 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {Function} keysFunc The function to get the keys of `object`.
      * @returns {Object} Returns `object`.
      */
-    function baseForRight(object, iterator, keysFunc) {
+    function baseForRight(object, iteratee, keysFunc) {
       var props = keysFunc(object),
           length = props.length;
 
       while (length--) {
         var key = props[length];
-        if (iterator(object[key], key, object) === false) {
+        if (iteratee(object[key], key, object) === false) {
           break;
         }
       }
@@ -1882,11 +1762,11 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Object} Returns `object`.
      */
-    function baseForIn(object, iterator) {
-      return baseFor(object, iterator, keysIn);
+    function baseForIn(object, iteratee) {
+      return baseFor(object, iteratee, keysIn);
     }
 
     /**
@@ -1895,11 +1775,11 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Object} Returns `object`.
      */
-    function baseForOwn(object, iterator) {
-      return baseFor(object, iterator, keys);
+    function baseForOwn(object, iteratee) {
+      return baseFor(object, iteratee, keys);
     }
 
     /**
@@ -1908,32 +1788,32 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Object} Returns `object`.
      */
-    function baseForOwnRight(object, iterator) {
-      return baseForRight(object, iterator, keys);
+    function baseForOwnRight(object, iteratee) {
+      return baseForRight(object, iteratee, keys);
     }
 
     /**
-     * The base implementation of `_.functions` which creates an array of function
-     * property names from those returned by `keysFunc`.
+     * The base implementation of `_.functions` which creates an array of
+     * `object` function property names filtered from those provided.
      *
      * @private
      * @param {Object} object The object to inspect.
-     * @param {Function} keysFunc The function to get the keys of `object`.
-     * @returns {Array} Returns the new sorted array of property names.
+     * @param {Array} props The property names to filter.
+     * @returns {Array} Returns the new array of filtered property names.
      */
-    function baseFunctions(object, keysFunc) {
+    function baseFunctions(object, props) {
       var index = -1,
-          props = keysFunc(object),
           length = props.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         var key = props[index];
         if (isFunction(object[key])) {
-          result.push(key);
+          result[++resIndex] = key;
         }
       }
       return result;
@@ -1995,7 +1875,7 @@
           return false;
         }
       }
-      else if (isErr || (valClass == objectClass && (support.nodeClass || !(isNode(value) || isNode(other))))) {
+      else if (isErr || (valClass == objectClass && (support.nodeClass || !(isHostObject(value) || isHostObject(other))))) {
         // unwrap any `lodash` wrapped values
         var valWrapped = hasOwnProperty.call(value, '__wrapped__'),
             othWrapped = hasOwnProperty.call(other, '__wrapped__');
@@ -2061,7 +1941,7 @@
             return (value != +value)
               ? other != +other
               // but treat `-0` vs. `+0` as not equal
-              : (value == 0 ? (1 / value == 1 / other) : value == +other);
+              : (value == 0 ? ((1 / value) == (1 / other)) : value == +other);
 
           case regexpClass:
           case stringClass:
@@ -2164,14 +2044,14 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns the new mapped array.
      */
-    function baseMap(collection, iterator) {
+    function baseMap(collection, iteratee) {
       var result = [];
 
       baseEach(collection, function(value, key, collection) {
-        result.push(iterator(value, key, collection));
+        result.push(iteratee(value, key, collection));
       });
       return result;
     }
@@ -2254,51 +2134,14 @@
      */
     function basePartial(func, bitmask, args, holders, thisArg) {
       if (func) {
-        var data = func[EXPANDO],
+        var data = getData(func),
             arity = data ? data[2] : func.length;
 
         arity -= args.length;
       }
-      var isPartial = bitmask & PARTIAL_FLAG,
-          newData = [func, bitmask, arity, thisArg, null, null];
-
-      newData[isPartial ? 4 : 6] = args;
-      newData[isPartial ? 5 : 7] = holders;
-      return createWrapper(newData);
-    }
-
-    /**
-     * The base implementation of `_.pick` without support for `this` binding
-     * and individual property name arguments.
-     *
-     * @private
-     * @param {Object} object The source object.
-     * @param {Function|string[]} predicate The function called per iteration or
-     *  property names to pick.
-     * @returns {Object} Returns the new object.
-     */
-    function basePick(object, predicate) {
-      var result = {};
-
-      if (typeof predicate == 'function') {
-        baseForIn(object, function(value, key, object) {
-          if (predicate(value, key, object)) {
-            result[key] = value;
-          }
-        });
-        return result;
-      }
-      var index = -1,
-          props = predicate,
-          length = props.length;
-
-      while (++index < length) {
-        var key = props[index];
-        if (key in object) {
-          result[key] = object[key];
-        }
-      }
-      return result;
+      return (bitmask & PARTIAL_FLAG)
+        ? createWrapper(func, bitmask, arity, thisArg, args, holders)
+        : createWrapper(func, bitmask, arity, thisArg, null, null, args, holders);
     }
 
     /**
@@ -2345,22 +2188,44 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {*} accumulator The initial value.
      * @param {boolean} initFromCollection Specify using the first or last element
      *  of `collection` as the initial value.
      * @param {Function} eachFunc The function to iterate over `collection`.
      * @returns {*} Returns the accumulated value.
      */
-    function baseReduce(collection, iterator, accumulator, initFromCollection, eachFunc) {
+    function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
       eachFunc(collection, function(value, index, collection) {
         accumulator = initFromCollection
           ? (initFromCollection = false, value)
-          : iterator(accumulator, value, index, collection)
+          : iteratee(accumulator, value, index, collection)
       });
       return accumulator;
     }
 
+    /**
+     * The base implementation of `setData` without support for hot loop detection.
+     *
+     * @private
+     * @param {Function} func The function to associate metadata with.
+     * @param {*} data The metadata.
+     * @returns {Function} Returns `func`.
+     */
+    function baseSetData(func, data) {
+      metaMap.set(func, data);
+      return func;
+    }
+    // fallback for environments without `WeakMap`
+    if (!WeakMap) {
+      baseSetData = !defineProperty ? identity : function(func, value) {
+        descriptor.value = value;
+        defineProperty(func, EXPANDO, descriptor);
+        descriptor.value = null;
+        return func;
+      };
+    }
+
     /**
      * The base implementation of `_.some` without support for callback shorthands
      * or `this` binding.
@@ -2388,24 +2253,24 @@
      * @private
      * @param {Array} array The array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {boolean} [retHighest=false] Specify returning the highest, instead
      *  of the lowest, index at which a value should be inserted into `array`.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      */
-    function baseSortedIndex(array, value, iterator, retHighest) {
+    function baseSortedIndex(array, value, iteratee, retHighest) {
       var low = 0,
           high = array ? array.length : low;
 
-      value = iterator(value);
+      value = iteratee(value);
       var hintNum = typeof value == 'number' ||
         (value != null && isFunction(value.valueOf) && typeof value.valueOf() == 'number');
 
       while (low < high) {
         var mid = (low + high) >>> 1,
-            computed = iterator(array[mid]),
-            setLow = retHighest ? computed <= value : computed < value;
+            computed = iteratee(array[mid]),
+            setLow = retHighest ? (computed <= value) : (computed < value);
 
         if (hintNum && typeof computed != 'undefined') {
           computed = +computed;
@@ -2426,10 +2291,10 @@
      *
      * @private
      * @param {Array} array The array to inspect.
-     * @param {Function} [iterator] The function called per iteration.
+     * @param {Function} [iteratee] The function called per iteration.
      * @returns {Array} Returns the new duplicate-value-free array.
      */
-    function baseUniq(array, iterator) {
+    function baseUniq(array, iteratee) {
       var index = -1,
           indexOf = getIndexOf(),
           length = array.length,
@@ -2442,27 +2307,27 @@
         var seen = createCache();
         indexOf = cacheIndexOf;
       } else {
-        seen = iterator ? [] : result;
+        seen = iteratee ? [] : result;
       }
       outer:
       while (++index < length) {
         var value = array[index],
-            computed = iterator ? iterator(value, index, array) : value;
+            computed = iteratee ? iteratee(value, index, array) : value;
 
-        if (isCommon) {
+        if (isCommon && value === value) {
           var seenIndex = seen.length;
           while (seenIndex--) {
             if (seen[seenIndex] === computed) {
               continue outer;
             }
           }
-          if (iterator) {
+          if (iteratee) {
             seen.push(computed);
           }
           result.push(value);
         }
         else if (indexOf(seen, computed) < 0) {
-          if (iterator || isLarge) {
+          if (iteratee || isLarge) {
             seen.push(computed);
           }
           result.push(value);
@@ -2493,6 +2358,36 @@
       return result;
     }
 
+    /**
+     * Creates a clone of the given array buffer.
+     *
+     * @private
+     * @param {ArrayBuffer} buffer The array buffer to clone.
+     * @returns {ArrayBuffer} Returns the cloned array buffer.
+     */
+    function bufferClone(buffer) {
+      return bufferSlice.call(buffer, 0);
+    }
+    if (!bufferSlice) {
+      // PhantomJS has `ArrayBuffer` and `Uint8Array` but not `Float64Array`
+      bufferClone = !(ArrayBuffer && Uint8Array) ? identity : function(buffer) {
+        var byteLength = buffer.byteLength,
+            floatLength = Float64Array ? floor(byteLength / FLOAT64_BYTES_PER_ELEMENT) : 0,
+            offset = floatLength * FLOAT64_BYTES_PER_ELEMENT,
+            result = new ArrayBuffer(byteLength);
+
+        if (floatLength) {
+          var view = new Float64Array(result, 0, floatLength);
+          view.set(new Float64Array(buffer, 0, floatLength));
+        }
+        if (byteLength != offset) {
+          view = new Uint8Array(result, offset);
+          view.set(new Uint8Array(buffer, offset));
+        }
+        return result;
+      };
+    }
+
     /**
      * Creates an array that is the composition of partially applied arguments,
      * placeholders, and provided arguments into a single array of arguments.
@@ -2558,7 +2453,7 @@
     /**
      * Creates a function that aggregates a collection, creating an accumulator
      * object composed from the results of running each element in the collection
-     * through `iterator`. The given setter function sets the keys and values of
+     * through `iteratee`. The given setter function sets the keys and values of
      * the accumulator object. If `initializer` is provided it is used to initialize
      * the accumulator object.
      *
@@ -2568,9 +2463,9 @@
      * @returns {Function} Returns the new aggregator function.
      */
     function createAggregator(setter, initializer) {
-      return function(collection, iterator, thisArg) {
+      return function(collection, iteratee, thisArg) {
         var result = initializer ? initializer() : {};
-        iterator = getCallback(iterator, thisArg, 3);
+        iteratee = getCallback(iteratee, thisArg, 3);
 
         if (isArray(collection)) {
           var index = -1,
@@ -2578,11 +2473,11 @@
 
           while (++index < length) {
             var value = collection[index];
-            setter(result, value, iterator(value, index, collection), collection);
+            setter(result, value, iteratee(value, index, collection), collection);
           }
         } else {
           baseEach(collection, function(value, key, collection) {
-            setter(result, value, iterator(value, key, collection), collection);
+            setter(result, value, iteratee(value, key, collection), collection);
           });
         }
         return result;
@@ -2598,44 +2493,43 @@
      * @returns {Function} Returns the new assigner function.
      */
     function createAssigner(assigner) {
-      return function(object) {
-        var args = arguments,
-            length = args.length;
+      return function() {
+        var length = arguments.length,
+            object = arguments[0];
 
         if (object == null || length < 2) {
           return object;
         }
         // enables use as a callback for functions like `_.reduce`
-        var type = typeof args[2];
-        if ((type == 'number' || type == 'string') && args[3] && args[3][args[2]] === args[1]) {
+        var type = typeof arguments[2];
+        if ((type == 'number' || type == 'string') && arguments[3] && arguments[3][arguments[2]] === arguments[1]) {
           length = 2;
         }
         // juggle arguments
-        if (length > 3 && typeof args[length - 2] == 'function') {
-          var customizer = baseCallback(args[--length - 1], args[length--], 5);
-        } else if (length > 2 && typeof args[length - 1] == 'function') {
-          customizer = args[--length];
+        if (length > 3 && typeof arguments[length - 2] == 'function') {
+          var customizer = baseCallback(arguments[--length - 1], arguments[length--], 5);
+        } else if (length > 2 && typeof arguments[length - 1] == 'function') {
+          customizer = arguments[--length];
         }
         var index = 0;
         while (++index < length) {
-          assigner(object, args[index], customizer);
+          assigner(object, arguments[index], customizer);
         }
         return object;
       };
     }
 
     /**
-     * Creates a function that invokes the function specified in the metadata
-     * with its associated `this` binding.
+     * Creates a function that wraps `func` and invokes it with the `this`
+     * binding of `thisArg`.
      *
      * @private
-     * @param {Array} data The metadata array. See `createWrapper` for more details.
-     * @returns {Function} Returns the new bound function.
+     * @param {Function} func The function to bind.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @returns {Function} Returns the new wrapped function.
      */
-    function createBindWrapper(data) {
-      var func = data[0],
-          thisArg = data[3],
-          Ctor = createCtorWrapper(func);
+    function createBindWrapper(func, thisArg) {
+      var Ctor = createCtorWrapper(func);
 
       function wrapper() {
         return (this instanceof wrapper ? Ctor : func).apply(thisArg, arguments);
@@ -2680,6 +2574,77 @@
       };
     }
 
+    /**
+     * Creates a function that wraps `func` and invokes it with optional `this`
+     * binding of, partial application, and currying.
+     *
+     * @private
+     * @param {Function|string} func The function or method name to reference.
+     * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+     * @param {number} arity The arity of `func`.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partialArgs] An array of arguments to prepend to those provided to the new function.
+     * @param {Array} [partialHolders] An array of `partialArgs` placeholder indexes.
+     * @param {Array} [partialRightArgs] An array of arguments to append to those provided to the new function.
+     * @param {Array} [partialRightHolders] An array of `partialRightArgs` placeholder indexes.
+     * @returns {Function} Returns the new function.
+     */
+    function createHybridWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders) {
+      var isBind = bitmask & BIND_FLAG,
+          isBindKey = bitmask & BIND_KEY_FLAG,
+          isCurry = bitmask & CURRY_FLAG,
+          isCurryRight = bitmask & CURRY_RIGHT_FLAG,
+          isCurryBound = bitmask & CURRY_BOUND_FLAG;
+
+      var Ctor = !isBindKey && createCtorWrapper(func),
+          key = func;
+
+      function wrapper() {
+        var length = arguments.length,
+            index = length,
+            args = Array(length);
+
+        while (index--) {
+          args[index] = arguments[index];
+        }
+        if (partialArgs) {
+          args = composeArgs(partialArgs, partialHolders, args);
+        }
+        if (partialRightArgs) {
+          args = composeArgsRight(partialRightArgs, partialRightHolders, args);
+        }
+        if (isCurry || isCurryRight) {
+          var placeholder = wrapper.placeholder,
+              holders = replaceHolders(args, placeholder);
+
+          length -= holders.length;
+          if (length < arity) {
+            var newArity = nativeMax(arity - length, 0),
+                newPartialArgs = isCurry ? args : null,
+                newPartialHolders = isCurry ? holders : null,
+                newPartialRightArgs = isCurry ? null : args,
+                newPartialRightHolders = isCurry ? null : holders;
+
+            bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG);
+            bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG);
+
+            if (!isCurryBound) {
+              bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
+            }
+            var result = createHybridWrapper(func, bitmask, newArity, thisArg, newPartialArgs, newPartialHolders, newPartialRightArgs, newPartialRightHolders);
+            result.placeholder = placeholder;
+            return setData(result, [func, bitmask, newArity, thisArg, newPartialArgs, newPartialHolders, newPartialRightArgs, newPartialRightHolders]);
+          }
+        }
+        var thisBinding = isBind ? thisArg : this;
+        if (isBindKey) {
+          func = thisBinding[key];
+        }
+        return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
+      }
+      return wrapper;
+    }
+
     /**
      * Creates the pad required for `string` based on the given padding length.
      * The `chars` string may be truncated if the number of padding characters
@@ -2704,25 +2669,25 @@
     }
 
     /**
-     * Creates a function that invokes the function specified in the metadata
-     * with its associated partially applied arguments and optional `this` binding.
+     * Creates a function that wraps `func` and invokes it with the optional `this`
+     * binding of `thisArg` and the `partialArgs` prepended to those provided to
+     * the wrapper.
      *
      * @private
-     * @param {Array} data The metadata array. See `createWrapper` for more details.
+     * @param {Function} func The function to partially apply arguments to.
+     * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+     * @param {Array} partialArgs An array of arguments to prepend to those provided to the new function.
+     * @param {*} [thisArg] The `this` binding of `func`.
      * @returns {Function} Returns the new bound function.
      */
-    function createPartialWrapper(data) {
-      var func = data[0],
-          thisArg = data[3],
-          partialArgs = data[4];
-
-      var isBind = data[1] & BIND_FLAG,
+    function createPartialWrapper(func, bitmask, partialArgs, thisArg) {
+      var isBind = bitmask & BIND_FLAG,
           Ctor = createCtorWrapper(func);
 
       function wrapper() {
         // avoid `arguments` object use disqualifying optimizations by
         // converting it to an array before passing it to `composeArgs`
-        var argsIndex = 0,
+        var argsIndex = -1,
             argsLength = arguments.length,
             leftIndex = -1,
             leftLength = partialArgs.length,
@@ -2732,7 +2697,7 @@
           args[leftIndex] = partialArgs[leftIndex];
         }
         while (argsLength--) {
-          args[leftIndex++] = arguments[argsIndex++];
+          args[leftIndex++] = arguments[++argsIndex];
         }
         return (this instanceof wrapper ? Ctor : func).apply(isBind ? thisArg : this, args);
       }
@@ -2744,9 +2709,8 @@
      * `this` binding and partially applied arguments.
      *
      * @private
-     * @param {Array} data The metadata array.
-     * @param {Function|string} data[0] The function or method name to reference.
-     * @param {number} data[1] The bitmask of flags to compose.
+     * @param {Function|string} func The function or method name to reference.
+     * @param {number} bitmask The bitmask of flags.
      *  The bitmask may be composed of the following flags:
      *   1  - `_.bind`
      *   2  - `_.bindKey`
@@ -2755,97 +2719,80 @@
      *   16 - `_.curry` or `_.curryRight` of a bound function
      *   32 - `_.partial`
      *   64 - `_.partialRight`
-     * @param {number} data[2] The arity of `data[0]`.
-     * @param {*} [data[3]] The `this` binding of `data[0]`.
-     * @param {Array} [data[4]] An array of arguments to prepend to those
-     *  provided to the new function.
-     * @param {Array} [data[5]] An array of `data[4]` placeholder indexes.
-     * @param {Array} [data[6]] An array of arguments to append to those
-     *  provided to the new function.
-     * @param {Array} [data[7]] An array of `data[6]` placeholder indexes.
+     * @param {number} arity The arity of `func`.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partialArgs] An array of arguments to prepend to those provided to the new function.
+     * @param {Array} [partialHolders] An array of `partialArgs` placeholder indexes.
+     * @param {Array} [partialRightArgs] An array of arguments to append to those provided to the new function.
+     * @param {Array} [partialRightHolders] An array of `partialRightArgs` placeholder indexes.
      * @returns {Function} Returns the new function.
      */
-    function createWrapper(data) {
-      var func = data[0],
-          bitmask = data[1];
-
-      var isBind = bitmask & BIND_FLAG,
-          isBindKey = bitmask & BIND_KEY_FLAG,
-          isPartial = bitmask & PARTIAL_FLAG,
-          isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
-
+    function createWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders) {
+      var isBindKey = bitmask & BIND_KEY_FLAG;
       if (!isBindKey && !isFunction(func)) {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
-      var arity = data[2],
-          partialArgs = data[4],
-          partialRightArgs = data[6];
-
+      var isPartial = bitmask & PARTIAL_FLAG;
       if (isPartial && !partialArgs.length) {
+        bitmask &= ~PARTIAL_FLAG;
         isPartial = false;
-        data[1] = (bitmask &= ~PARTIAL_FLAG);
-        data[4] = data[5] = partialArgs = null;
+        partialArgs = partialHolders = null;
       }
+      var isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
       if (isPartialRight && !partialRightArgs.length) {
+        bitmask &= ~PARTIAL_RIGHT_FLAG;
         isPartialRight = false;
-        data[1] = (bitmask &= ~PARTIAL_RIGHT_FLAG);
-        data[6] = data[7] = partialRightArgs = null;
+        partialRightArgs = partialRightHolders = null;
       }
-      var funcData = !isBindKey && func[EXPANDO];
-      if (funcData && funcData !== true) {
-        // shallow clone `funcData`
-        funcData = slice(funcData);
+      var data = (data = !isBindKey && getData(func)) && data !== true && data;
+      if (data) {
+        var funcBitmask = data[1],
+            funcIsBind = funcBitmask & BIND_FLAG,
+            isBind = bitmask & BIND_FLAG;
 
-        // clone partial left arguments
-        if (funcData[4]) {
-          funcData[4] = slice(funcData[4]);
-          funcData[5] = slice(funcData[5]);
+        // use metadata `func` and merge bitmasks
+        func = data[0];
+        bitmask |= funcBitmask;
+
+        // use metadata `arity` if not provided
+        if (arity == null) {
+          arity = data[2];
         }
-        // clone partial right arguments
-        if (funcData[6]) {
-          funcData[6] = slice(funcData[6]);
-          funcData[7] = slice(funcData[7]);
-        }
-        // set arity if provided
-        if (typeof arity == 'number') {
-          funcData[2] = arity;
-        }
-        // set `thisArg` if not previously bound
-        var bound = funcData[1] & BIND_FLAG;
-        if (isBind && !bound) {
-          funcData[3] = data[3];
+        // use metadata `thisArg` if available
+        if (funcIsBind) {
+          thisArg = data[3];
         }
         // set if currying a bound function
-        if (!isBind && bound) {
+        if (!isBind && funcIsBind) {
           bitmask |= CURRY_BOUND_FLAG;
         }
         // append partial left arguments
-        if (isPartial) {
-          var funcPartialArgs = funcData[4];
-          if (funcPartialArgs) {
-            funcPartialArgs = composeArgs(funcPartialArgs, funcData[5], partialArgs);
-          }
-          funcData[4] = funcPartialArgs || partialArgs;
-          funcData[5] = funcPartialArgs ? replaceHolders(funcPartialArgs, PLACEHOLDER) : data[5];
+        var funcArgs = data[4];
+        if (funcArgs) {
+          var funcHolders = data[5];
+          partialArgs = isPartial ? composeArgs(funcArgs, funcHolders, partialArgs) : baseSlice(funcArgs);
+          partialHolders = isPartial ? replaceHolders(partialArgs, PLACEHOLDER) : baseSlice(funcHolders);
         }
         // prepend partial right arguments
-        if (isPartialRight) {
-          var funcPartialRightArgs = funcData[6];
-          if (funcPartialRightArgs) {
-            funcPartialRightArgs = composeArgsRight(funcPartialRightArgs, funcData[7], partialRightArgs);
-          }
-          funcData[6] = funcPartialRightArgs || partialRightArgs;
-          funcData[7] = funcPartialRightArgs ? replaceHolders(funcPartialRightArgs, PLACEHOLDER) : data[7];
+        funcArgs = data[6];
+        if (funcArgs) {
+          funcHolders = data[7];
+          partialRightArgs = isPartialRight ? composeArgsRight(funcArgs, funcHolders, partialRightArgs) : baseSlice(funcArgs);
+          partialRightHolders = isPartialRight ? replaceHolders(partialRightArgs, PLACEHOLDER) : baseSlice(funcHolders);
         }
-        // merge flags
-        funcData[1] |= bitmask;
-        return createWrapper(funcData);
       }
       if (arity == null) {
         arity = isBindKey ? 0 : func.length;
       }
-      data[2] = nativeMax(arity, 0);
-      return baseCreateWrapper(data);
+      if (bitmask == BIND_FLAG) {
+        var result = createBindWrapper(func, thisArg);
+      } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !partialHolders.length) {
+        result = createPartialWrapper(func, bitmask, partialArgs, thisArg);
+      } else {
+        result = createHybridWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders);
+      }
+      var setter = data ? baseSetData : setData;
+      return setter(result, [func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders]);
     }
 
     /**
@@ -2860,7 +2807,24 @@
     function getCallback(func, thisArg, argCount) {
       var result = lodash.callback || callback;
       result = result === callback ? baseCallback : result;
-      return arguments.length ? result(func, thisArg, argCount) : result;
+      return argCount ? result(func, thisArg, argCount) : result;
+    }
+
+    /**
+     * Gets metadata for `func`.
+     *
+     * @private
+     * @param {Function} func The function to query.
+     * @returns {*} Returns the metadata for `func`.
+     */
+    function getData(func) {
+      return metaMap.get(func);
+    }
+    // fallback for environments without `WeakMap`
+    if (!WeakMap) {
+      getData = !defineProperty ? noop : function(func) {
+        return func[EXPANDO];
+      };
     }
 
     /**
@@ -2878,6 +2842,88 @@
       return collection ? result(collection, target, fromIndex) : result;
     }
 
+    /**
+     * Initializes an array clone.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep=false] Specify a deep clone.
+     * @returns {*} Returns the initialized clone value.
+     */
+    function initArrayClone(array, isDeep) {
+      var index = -1,
+          length = array.length,
+          result = array.constructor(length);
+
+      if (!isDeep) {
+        while (++index < length) {
+          result[index] = array[index];
+        }
+      }
+      // add array properties assigned by `RegExp#exec`
+      if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+        result.index = array.index;
+        result.input = array.input;
+      }
+      return result;
+    }
+
+    /**
+     * Initializes an object clone.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep=false] Specify a deep clone.
+     * @returns {*} Returns the initialized clone value.
+     */
+    function initObjectClone(object, isDeep) {
+      var className = toString.call(object);
+      if (!cloneableClasses[className] || (!support.nodeClass && isHostObject(object))) {
+        return object;
+      }
+      var Ctor = object.constructor,
+          isArgs = className == argsClass || (!support.argsClass && isArguments(object)),
+          isObj = className == objectClass;
+
+      if (isObj && !(isFunction(Ctor) && (Ctor instanceof Ctor))) {
+        Ctor = Object;
+      }
+      if (isArgs || isObj) {
+        var result = isDeep ? new Ctor : baseAssign(new Ctor, object);
+        if (isArgs) {
+          result.length = object.length;
+        }
+        return result;
+      }
+      switch (className) {
+        case arrayBufferClass:
+          return bufferClone(object);
+
+        case boolClass:
+        case dateClass:
+          return new Ctor(+object);
+
+        case float32Class: case float64Class:
+        case int8Class: case int16Class: case int32Class:
+        case uint8Class: case uint8ClampedClass: case uint16Class: case uint32Class:
+          // Safari 5 mobile incorrectly has `Object` as the constructor
+          if (Ctor instanceof Ctor) {
+            Ctor = ctorByClass[className];
+          }
+          var buffer = object.buffer;
+          return new Ctor(isDeep ? bufferClone(buffer) : buffer, object.byteOffset, object.length);
+
+        case numberClass:
+        case stringClass:
+          return new Ctor(object);
+
+        case regexpClass:
+          result = Ctor(object.source, reFlags.exec(object));
+          result.lastIndex = object.lastIndex;
+      }
+      return result;
+    }
+
     /**
      * Checks if `value` is an array-like object.
      *
@@ -2891,18 +2937,17 @@
     }
 
     /**
-     * Checks if `value` is a native function.
+     * Checks if `value` is a host object in IE < 9.
      *
      * @private
      * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+     * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
      */
-    function isNative(value) {
-      var type = typeof value;
-      return type == 'function'
-        ? reNative.test(fnToString.call(value))
-        : (value && type == 'object' && reHostCtor.test(toString.call(value))) || false;
-    }
+    var isHostObject = support.hostObject ? constant(false) : function(value) {
+      // IE < 9 presents many host objects as `Object` objects that can coerce to
+      // strings despite having improperly defined `toString` methods
+      return typeof value.toString != 'function' && typeof (value + '') == 'string';
+    };
 
     /**
      * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
@@ -2913,37 +2958,50 @@
      *  equality comparisons, else `false`.
      */
     function isStrictComparable(value) {
-      return value === value && (value === 0 ? (1 / value > 0) : !isObject(value));
+      return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
     }
 
     /**
-     * Creates a clone of the given array buffer.
+     * A specialized version of `_.pick` that picks `object` properties
+     * specified by the `props` array.
      *
      * @private
-     * @param {ArrayBuffer} buffer The array buffer to clone.
-     * @returns {ArrayBuffer} Returns the cloned array buffer.
+     * @param {Object} object The source object.
+     * @param {string[]} props The property names to pick.
+     * @returns {Object} Returns the new object.
      */
-    function cloneBuffer(buffer) {
-      return bufferSlice.call(buffer, 0);
-    }
-    if (!bufferSlice) {
-      // PhantomJS has `ArrayBuffer` and `Uint8Array` but not `Float64Array`
-      cloneBuffer = !(ArrayBuffer && Uint8Array) ? identity : function(buffer) {
-        var byteLength = buffer.byteLength,
-            floatLength = Float64Array ? floor(byteLength / FLOAT64_BYTES_PER_ELEMENT) : 0,
-            offset = floatLength * FLOAT64_BYTES_PER_ELEMENT,
-            result = new ArrayBuffer(byteLength);
+    function pickByArray(object, props) {
+      var index = -1,
+          length = props.length,
+          result = {};
 
-        if (floatLength) {
-          var view = new Float64Array(result, 0, floatLength);
-          view.set(new Float64Array(buffer, 0, floatLength));
+      while (++index < length) {
+        var key = props[index];
+        if (key in object) {
+          result[key] = object[key];
         }
-        if (byteLength != offset) {
-          view = new Uint8Array(result, offset);
-          view.set(new Uint8Array(buffer, offset));
+      }
+      return result;
+    }
+
+    /**
+     * A specialized version of `_.pick` that picks `object` properties
+     * the predicate returns truthy for.
+     *
+     * @private
+     * @param {Object} object The source object.
+     * @param {Function} predicate The function called per iteration.
+     * @returns {Object} Returns the new object.
+     */
+    function pickByCallback(object, predicate) {
+      var result = {};
+
+      baseForIn(object, function(value, key, object) {
+        if (predicate(value, key, object)) {
+          result[key] = value;
         }
-        return result;
-      };
+      });
+      return result;
     }
 
     /**
@@ -2958,31 +3016,49 @@
     function replaceHolders(array, placeholder) {
       var index = -1,
           length = array.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         if (array[index] === placeholder) {
           array[index] = PLACEHOLDER;
-          result.push(index);
+          result[++resIndex] = index;
         }
       }
       return result;
     }
 
     /**
-     * Sets wrapper metadata on a given function.
+     * Sets metadata for `func`.
+     *
+     * **Note**: If this function becomes hot, i.e. is called a lot in a short
+     * period of time, it will trip its breaker and transition to an identity
+     * function to avoid garbage collection pauses.
      *
      * @private
-     * @param {Function} func The function to set data on.
-     * @param {Array} value The data array to set.
+     * @param {Function} func The function to associate metadata with.
+     * @param {*} data The metadata.
      * @returns {Function} Returns `func`.
      */
-    var setData = !defineProperty ? identity : function(func, value) {
-      descriptor.value = value;
-      defineProperty(func, EXPANDO, descriptor);
-      descriptor.value = null;
-      return func;
-    };
+    var setData = (function() {
+      var count = 0,
+          lastCalled = 0;
+
+      return function(key, value) {
+        var stamp = now ? now() : 0,
+            remaining = HOT_SPAN - (stamp - lastCalled);
+
+        lastCalled = stamp;
+        if (remaining > 0) {
+          if (++count > HOT_COUNT) {
+            return key;
+          }
+        } else {
+          count = 0;
+        }
+        return baseSetData(key, value);
+      };
+    }());
 
     /**
      * A fallback implementation of `_.isPlainObject` which checks if `value`
@@ -3002,7 +3078,7 @@
           (!hasOwnProperty.call(value, 'constructor') &&
             (Ctor = value.constructor, isFunction(Ctor) && !(Ctor instanceof Ctor))) ||
           (!support.argsClass && isArguments(value)) ||
-          (!support.nodeClass && isNode(value))) {
+          (!support.nodeClass && isHostObject(value))) {
         return false;
       }
       // IE < 9 iterates inherited properties before own properties. If the first
@@ -3061,22 +3137,23 @@
      *
      * @private
      * @param {Array} array The array to inspect.
-     * @param {Function} [iterator] The function called per iteration.
+     * @param {Function} [iteratee] The function called per iteration.
      * @returns {Array} Returns the new duplicate-value-free array.
      */
-    function sortedUniq(array, iterator) {
+    function sortedUniq(array, iteratee) {
       var seen,
           index = -1,
           length = array.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         var value = array[index],
-            computed = iterator ? iterator(value, index, array) : value;
+            computed = iteratee ? iteratee(value, index, array) : value;
 
         if (!index || seen !== computed) {
           seen = computed;
-          result.push(value);
+          result[++resIndex] = value;
         }
       }
       return result;
@@ -3121,7 +3198,7 @@
     /*--------------------------------------------------------------------------*/
 
     /**
-     * Creates an array of elements split into groups the length of `chunkSize`.
+     * Creates an array of elements split into groups the length of `size`.
      * If `collection` can't be split evenly, the final chunk will be the remaining
      * elements.
      *
@@ -3129,7 +3206,7 @@
      * @memberOf _
      * @category Array
      * @param {Array} array The array to process.
-     * @param {numer} [chunkSize=1] The size of each chunk.
+     * @param {numer} [size=1] The length of each chunk.
      * @returns {Array} Returns the new array containing chunks.
      * @example
      *
@@ -3139,14 +3216,15 @@
      * _.chunk(['a', 'b', 'c', 'd'], 3);
      * // => [['a', 'b', 'c'], ['d']]
      */
-    function chunk(array, chunkSize) {
+    function chunk(array, size) {
       var index = 0,
           length = array ? array.length : 0,
+          resIndex = -1,
           result = [];
 
-      chunkSize = nativeMax(+chunkSize || 1, 1);
+      size = typeof size == 'undefined' ? 1 : nativeMax(+size || 1, 1);
       while (index < length) {
-        result.push(slice(array, index, (index += chunkSize)));
+        result[++resIndex] = slice(array, index, (index += size));
       }
       return result;
     }
@@ -3181,8 +3259,12 @@
     }
 
     /**
-     * Creates an array excluding all values of the provided arrays using strict
-     * equality for comparisons, i.e. `===`.
+     * Creates an array excluding all values of the provided arrays using
+     * `SameValueZero` for equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3315,7 +3397,7 @@
           index = length;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (index-- && predicate(array[index], index, array)) { }
+      while (index-- && predicate(array[index], index, array)) {}
       return slice(array, 0, index + 1);
     }
 
@@ -3364,7 +3446,7 @@
           length = array ? array.length : 0;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (++index < length && predicate(array[index], index, array)) { }
+      while (++index < length && predicate(array[index], index, array)) {}
       return slice(array, index);
     }
 
@@ -3549,10 +3631,14 @@
 
     /**
      * Gets the index at which the first occurrence of `value` is found in `array`
-     * using strict equality for comparisons, i.e. `===`. If `fromIndex` is negative,
+     * using `SameValueZero` for equality comparisons. If `fromIndex` is negative,
      * it is used as the offset from the end of the collection. If `array` is
      * sorted providing `true` for `fromIndex` performs a faster binary search.
      *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
+     *
      * @static
      * @memberOf _
      * @category Array
@@ -3606,7 +3692,11 @@
 
     /**
      * Creates an array of unique values present in all provided arrays using
-     * strict equality for comparisons, i.e. `===`.
+     * `SameValueZero` for equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3714,8 +3804,10 @@
         index = sortedLastIndex(array, value) - 1;
         return (length && array[index] === value) ? index : -1;
       }
+      var isReflexive = value === value;
       while (index--) {
-        if (array[index] === value) {
+        var other = array[index];
+        if ((isReflexive ? other === value : other !== other)) {
           return index;
         }
       }
@@ -3723,10 +3815,14 @@
     }
 
     /**
-     * Removes all provided values from `array` using strict equality for
-     * comparisons, i.e. `===`.
+     * Removes all provided values from `array` using `SameValueZero` for equality
+     * comparisons.
      *
-     * Note: Unlike `_.without`, this method mutates `array`.
+     * **Note:** Unlike `_.without`, this method mutates `array`.
+     *
+     * `SameValueZero` is like strict equality, e.g. `===`, except that `NaN` matches
+     * `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3741,20 +3837,18 @@
      * console.log(array);
      * // => [1, 1]
      */
-    function pull(array) {
-      var argsIndex = 0,
-          argsLength = arguments.length,
-          length = array ? array.length : 0;
+    function pull() {
+      var array = arguments[0],
+          index = 0,
+          indexOf = getIndexOf(),
+          length = arguments.length;
 
-      while (++argsIndex < argsLength) {
-        var index = -1,
-            value = arguments[argsIndex];
+      while (++index < length) {
+        var fromIndex = 0,
+            value = arguments[index];
 
-        while (++index < length) {
-          if (array[index] === value) {
-            splice.call(array, index--, 1);
-            length--;
-          }
+        while ((fromIndex = indexOf(array, value, fromIndex)) > -1) {
+          splice.call(array, fromIndex, 1);
         }
       }
       return array;
@@ -3765,7 +3859,7 @@
      * returns an array of the removed elements. Indexes may be specified as an
      * array of indexes or as individual arguments.
      *
-     * Note: Unlike `_.at`, this method mutates `array`.
+     * **Note:** Unlike `_.at`, this method mutates `array`.
      *
      * @static
      * @memberOf _
@@ -3801,7 +3895,7 @@
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
-     * Note: Unlike `_.filter`, this method mutates `array`.
+     * **Note:** Unlike `_.filter`, this method mutates `array`.
      *
      * @static
      * @memberOf _
@@ -3861,7 +3955,7 @@
     /**
      * Slices `array` from the `start` index up to, but not including, the `end` index.
      *
-     * Note: This function is used instead of `Array#slice` to support node lists
+     * **Note:** This function is used instead of `Array#slice` to support node lists
      * in IE < 9 and to ensure dense arrays are returned.
      *
      * @static
@@ -3884,6 +3978,9 @@
       if (end < 0) {
         end += length;
       }
+      if (end && end == length && !start) {
+        return baseSlice(array);
+      }
       length = start > end ? 0 : (end - start);
 
       var result = Array(length);
@@ -3896,14 +3993,14 @@
     /**
      * Uses a binary search to determine the lowest index at which a value should
      * be inserted into a given sorted array in order to maintain the sort order
-     * of the array. If an iterator function is provided it is executed for `value`
-     * and each element of `array` to compute their sort ranking. The iterator
+     * of the array. If an iteratee function is provided it is executed for `value`
+     * and each element of `array` to compute their sort ranking. The iteratee
      * function is bound to `thisArg` and invoked with one argument; (value).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -3912,10 +4009,10 @@
      * @category Array
      * @param {Array} array The array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      * @example
@@ -3928,7 +4025,7 @@
      *
      * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };
      *
-     * // using an iterator function
+     * // using an iteratee function
      * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) {
      *   return this.data[word];
      * }, dict);
@@ -3938,9 +4035,9 @@
      * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
      * // => 1
      */
-    function sortedIndex(array, value, iterator, thisArg) {
-      iterator = iterator == null ? identity : getCallback(iterator, thisArg, 1);
-      return baseSortedIndex(array, value, iterator);
+    function sortedIndex(array, value, iteratee, thisArg) {
+      iteratee = iteratee == null ? identity : getCallback(iteratee, thisArg, 1);
+      return baseSortedIndex(array, value, iteratee);
     }
 
     /**
@@ -3953,10 +4050,10 @@
      * @category Array
      * @param {Array} array The array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      * @example
@@ -3964,9 +4061,9 @@
      * _.sortedLastIndex([4, 4, 5, 5, 6, 6], 5);
      * // => 4
      */
-    function sortedLastIndex(array, value, iterator, thisArg) {
-      iterator = iterator == null ? identity : getCallback(iterator, thisArg, 1);
-      return baseSortedIndex(array, value, iterator, true);
+    function sortedLastIndex(array, value, iteratee, thisArg) {
+      iteratee = iteratee == null ? identity : getCallback(iteratee, thisArg, 1);
+      return baseSortedIndex(array, value, iteratee, true);
     }
 
     /**
@@ -4076,7 +4173,7 @@
           index = length;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (index-- && predicate(array[index], index, array)) { }
+      while (index-- && predicate(array[index], index, array)) {}
       return slice(array, index + 1);
     }
 
@@ -4125,13 +4222,17 @@
           length = array ? array.length : 0;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (++index < length && predicate(array[index], index, array)) { }
+      while (++index < length && predicate(array[index], index, array)) {}
       return slice(array, 0, index);
     }
 
     /**
      * Creates an array of unique values, in order, of the provided arrays using
-     * strict equality for comparisons, i.e. `===`.
+     * `SameValueZero` for equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -4148,30 +4249,34 @@
     }
 
     /**
-     * Creates a duplicate-value-free version of an array using strict equality
-     * for comparisons, i.e. `===`. Providing `true` for `isSorted` performs a
-     * faster search algorithm for sorted arrays. If an iterator function is
-     * provided it is executed for each value in the array to generate the criterion
-     * by which uniqueness is computed. The `iterator` is bound to `thisArg` and
-     * invoked with three arguments; (value, index, array).
+     * Creates a duplicate-value-free version of an array using `SameValueZero`
+     * for equality comparisons. Providing `true` for `isSorted` performs a faster
+     * search algorithm for sorted arrays. If an iteratee function is provided it
+     * is executed for each value in the array to generate the criterion by which
+     * uniqueness is computed. The `iteratee` is bound to `thisArg` and invoked
+     * with three arguments; (value, index, array).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
+     *
      * @static
      * @memberOf _
      * @alias unique
      * @category Array
      * @param {Array} array The array to inspect.
      * @param {boolean} [isSorted=false] Specify the array is sorted.
-     * @param {Function|Object|string} [iterator] The function called per iteration.
+     * @param {Function|Object|string} [iteratee] The function called per iteration.
      *  If a property name or object is provided it is used to create a "_.pluck"
      *  or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the new duplicate-value-free array.
      * @example
      *
@@ -4182,7 +4287,7 @@
      * _.uniq([1, 1, 2], true);
      * // => [1, 2]
      *
-     * // using an iterator function
+     * // using an iteratee function
      * _.uniq([1, 2.5, 1.5, 2], function(n) { return this.floor(n); }, Math);
      * // => [1, 2.5]
      *
@@ -4190,7 +4295,7 @@
      * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
-    function uniq(array, isSorted, iterator, thisArg) {
+    function uniq(array, isSorted, iteratee, thisArg) {
       var length = array ? array.length : 0;
       if (!length) {
         return [];
@@ -4198,21 +4303,21 @@
       // juggle arguments
       var type = typeof isSorted;
       if (type != 'boolean' && isSorted != null) {
-        thisArg = iterator;
-        iterator = isSorted;
+        thisArg = iteratee;
+        iteratee = isSorted;
         isSorted = false;
 
         // enables use as a callback for functions like `_.map`
-        if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === array) {
-          iterator = null;
+        if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === array) {
+          iteratee = null;
         }
       }
-      if (iterator != null) {
-        iterator = getCallback(iterator, thisArg, 3);
+      if (iteratee != null) {
+        iteratee = getCallback(iteratee, thisArg, 3);
       }
       return (isSorted && getIndexOf() == baseIndexOf)
-        ? sortedUniq(array, iterator)
-        : baseUniq(array, iterator);
+        ? sortedUniq(array, iteratee)
+        : baseUniq(array, iteratee);
     }
 
     /**
@@ -4245,8 +4350,12 @@
     }
 
     /**
-     * Creates an array excluding all provided values using strict equality for
-     * comparisons, i.e. `===`.
+     * Creates an array excluding all provided values using `SameValueZero` for
+     * equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -4259,8 +4368,8 @@
      * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
      * // => [2, 3, 4]
      */
-    function without() {
-      return baseDifference(arguments[0], slice(arguments, 1));
+    function without(array) {
+      return baseDifference(array, slice(arguments, 1));
     }
 
     /**
@@ -4312,7 +4421,13 @@
      * // => [['fred', 30, true], ['barney', 40, false]]
      */
     function zip() {
-      return unzip(arguments);
+      var length = arguments.length,
+          array = Array(length);
+
+      while (length--) {
+        array[length] = arguments[length];
+      }
+      return unzip(array);
     }
 
     /**
@@ -4504,9 +4619,13 @@
     }
 
     /**
-     * Checks if `value` is present in `collection` using strict equality for
-     * comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the
-     * offset from the end of the collection.
+     * Checks if `value` is present in `collection` using  `SameValueZero` for
+     * equality comparisons. If `fromIndex` is negative, it is used as the offset
+     * from the end of the collection.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -4542,28 +4661,22 @@
       } else {
         fromIndex = 0;
       }
-      if (typeof collection == 'string' || !isArray(collection) && isString(collection)) {
-        if (fromIndex >= length) {
-          return false;
-        }
-        return nativeContains
-          ? nativeContains.call(collection, target, fromIndex)
-          : collection.indexOf(target, fromIndex) > -1;
-      }
-      return getIndexOf(collection, target, fromIndex) > -1;
+      return (typeof collection == 'string' || !isArray(collection) && isString(collection))
+        ? (fromIndex < length && collection.indexOf(target, fromIndex) > -1)
+        : (getIndexOf(collection, target, fromIndex) > -1);
     }
 
     /**
      * Creates an object composed of keys generated from the results of running
-     * each element of `collection` through `iterator`. The corresponding value
-     * of each key is the number of times the key was returned by `iterator`.
-     * The `iterator` is bound to `thisArg` and invoked with three arguments;
+     * each element of `collection` through `iteratee`. The corresponding value
+     * of each key is the number of times the key was returned by `iteratee`.
+     * The `iteratee` is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4571,10 +4684,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the composed aggregate object.
      * @example
      *
@@ -4633,10 +4746,10 @@
      * // => false
      */
     function every(collection, predicate, thisArg) {
+      var func = isArray(collection) ? arrayEvery : baseEvery;
       if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
         predicate = getCallback(predicate, thisArg, 3);
       }
-      var func = isArray(collection) ? arrayEvery : baseEvery;
       return func(collection, predicate);
     }
 
@@ -4681,9 +4794,9 @@
      * // => [{ 'name': 'barney', 'age': 36 }]
      */
     function filter(collection, predicate, thisArg) {
-      predicate = getCallback(predicate, thisArg, 3);
-
       var func = isArray(collection) ? arrayFilter : baseFilter;
+
+      predicate = getCallback(predicate, thisArg, 3);
       return func(collection, predicate);
     }
 
@@ -4791,12 +4904,12 @@
     }
 
     /**
-     * Iterates over elements of `collection` executing `iterator` for each
-     * element. The `iterator` is bound to `thisArg` and invoked with three arguments;
+     * Iterates over elements of `collection` executing `iteratee` for each
+     * element. The `iteratee` is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection). Iterator functions may exit iteration early
      * by explicitly returning `false`.
      *
-     * Note: As with other "Collections" methods, objects with a `length` property
+     * **Note:** As with other "Collections" methods, objects with a `length` property
      * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
      * may be used for object iteration.
      *
@@ -4805,8 +4918,8 @@
      * @alias each
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array|Object|string} Returns `collection`.
      * @example
      *
@@ -4814,12 +4927,12 @@
      * // => logs each value and returns the array
      *
      * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); });
-     * // => logs each value-key pair and returns the object (property order is not guaranteed across environments)
+     * // => logs each value-key pair and returns the object (property order is not guaranteed)
      */
-    function forEach(collection, iterator, thisArg) {
-      return (typeof iterator == 'function' && typeof thisArg == 'undefined' && isArray(collection))
-        ? arrayEach(collection, iterator)
-        : baseEach(collection, baseCallback(iterator, thisArg, 3));
+    function forEach(collection, iteratee, thisArg) {
+      return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+        ? arrayEach(collection, iteratee)
+        : baseEach(collection, baseCallback(iteratee, thisArg, 3));
     }
 
     /**
@@ -4831,31 +4944,31 @@
      * @alias eachRight
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array|Object|string} Returns `collection`.
      * @example
      *
      * _([1, 2, 3]).forEachRight(function(n) { console.log(n); }).join(',');
      * // => logs each value from right to left and returns the array
      */
-    function forEachRight(collection, iterator, thisArg) {
-      return (typeof iterator == 'function' && typeof thisArg == 'undefined' && isArray(collection))
-        ? arrayEachRight(collection, iterator)
-        : baseEachRight(collection, baseCallback(iterator, thisArg, 3));
+    function forEachRight(collection, iteratee, thisArg) {
+      return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+        ? arrayEachRight(collection, iteratee)
+        : baseEachRight(collection, baseCallback(iteratee, thisArg, 3));
     }
 
     /**
      * Creates an object composed of keys generated from the results of running
-     * each element of `collection` through `iterator`. The corresponding
+     * each element of `collection` through `iteratee`. The corresponding
      * value of each key is an array of the elements responsible for generating
-     * the key. The `iterator` is bound to `thisArg` and invoked with three
+     * the key. The `iteratee` is bound to `thisArg` and invoked with three
      * arguments; (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4863,10 +4976,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the composed aggregate object.
      * @example
      *
@@ -4890,15 +5003,15 @@
 
     /**
      * Creates an object composed of keys generated from the results of running
-     * each element of the collection through `iterator`. The corresponding value
+     * each element of the collection through `iteratee`. The corresponding value
      * of each key is the last element responsible for generating the key. The
-     * iterator function is bound to `thisArg` and invoked with three arguments;
+     * iteratee function is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4906,10 +5019,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the composed aggregate object.
      * @example
      *
@@ -4959,13 +5072,13 @@
 
     /**
      * Creates an array of values by running each element in the collection through
-     * `iterator`. The `iterator` is bound to `thisArg` and invoked with three
+     * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
      * arguments; (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4974,10 +5087,10 @@
      * @alias collect
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the new mapped array.
      * @example
      *
@@ -4985,7 +5098,7 @@
      * // => [3, 6, 9]
      *
      * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; });
-     * // => [3, 6, 9] (property order is not guaranteed across environments)
+     * // => [3, 6, 9] (property order is not guaranteed)
      *
      * var characters = [
      *   { 'name': 'barney', 'age': 36 },
@@ -4996,24 +5109,24 @@
      * _.map(characters, 'name');
      * // => ['barney', 'fred']
      */
-    function map(collection, iterator, thisArg) {
-      iterator = getCallback(iterator, thisArg, 3);
+    function map(collection, iteratee, thisArg) {
+      iteratee = getCallback(iteratee, thisArg, 3);
 
       var func = isArray(collection) ? arrayMap : baseMap;
-      return func(collection, iterator);
+      return func(collection, iteratee);
     }
 
     /**
      * Retrieves the maximum value of `collection`. If the collection is empty
-     * or falsey `-Infinity` is returned. If an iterator function is provided it
+     * or falsey `-Infinity` is returned. If an iteratee function is provided it
      * is executed for each value in the collection to generate the criterion by
-     * which the value is ranked. The `iterator` is bound to `thisArg` and invoked
+     * which the value is ranked. The `iteratee` is bound to `thisArg` and invoked
      * with three arguments; (value, index, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -5021,10 +5134,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator] The function called per iteration.
+     * @param {Function|Object|string} [iteratee] The function called per iteration.
      *  If a property name or object is provided it is used to create a "_.pluck"
      *  or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the maximum value.
      * @example
      *
@@ -5046,20 +5159,20 @@
      * _.max(characters, 'age');
      * // => { 'name': 'fred', 'age': 40 };
      */
-    function max(collection, iterator, thisArg) {
+    function max(collection, iteratee, thisArg) {
       var computed = -Infinity,
           result = computed,
-          type = typeof iterator;
+          type = typeof iteratee;
 
       // enables use as a callback for functions like `_.map`
-      if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === collection) {
-        iterator = null;
+      if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === collection) {
+        iteratee = null;
       }
-      var noIterator = iterator == null,
-          isArr = noIterator && isArray(collection),
+      var noIteratee = iteratee == null,
+          isArr = noIteratee && isArray(collection),
           isStr = !isArr && isString(collection);
 
-      if (noIterator && !isStr) {
+      if (noIteratee && !isStr) {
         var index = -1,
             iterable = toIterable(collection),
             length = iterable.length;
@@ -5071,12 +5184,12 @@
           }
         }
       } else {
-        iterator = (noIterator && isStr)
+        iteratee = (noIteratee && isStr)
           ? charAtCallback
-          : getCallback(iterator, thisArg, 3);
+          : getCallback(iteratee, thisArg, 3);
 
         baseEach(collection, function(value, index, collection) {
-          var current = iterator(value, index, collection);
+          var current = iteratee(value, index, collection);
           if (current > computed || (current === -Infinity && current === result)) {
             computed = current;
             result = value;
@@ -5088,15 +5201,15 @@
 
     /**
      * Retrieves the minimum value of `collection`. If the collection is empty
-     * or falsey `Infinity` is returned. If an iterator function is provided it
+     * or falsey `Infinity` is returned. If an iteratee function is provided it
      * is executed for each value in the collection to generate the criterion by
-     * which the value is ranked. The `iterator` is bound to `thisArg` and invoked
+     * which the value is ranked. The `iteratee` is bound to `thisArg` and invoked
      * with three arguments; (value, index, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -5104,10 +5217,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator] The function called per iteration.
+     * @param {Function|Object|string} [iteratee] The function called per iteration.
      *  If a property name or object is provided it is used to create a "_.pluck"
      *  or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the minimum value.
      * @example
      *
@@ -5129,20 +5242,20 @@
      * _.min(characters, 'age');
      * // => { 'name': 'barney', 'age': 36 };
      */
-    function min(collection, iterator, thisArg) {
+    function min(collection, iteratee, thisArg) {
       var computed = Infinity,
           result = computed,
-          type = typeof iterator;
+          type = typeof iteratee;
 
       // enables use as a callback for functions like `_.map`
-      if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === collection) {
-        iterator = null;
+      if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === collection) {
+        iteratee = null;
       }
-      var noIterator = iterator == null,
-          isArr = noIterator && isArray(collection),
+      var noIteratee = iteratee == null,
+          isArr = noIteratee && isArray(collection),
           isStr = !isArr && isString(collection);
 
-      if (noIterator && !isStr) {
+      if (noIteratee && !isStr) {
         var index = -1,
             iterable = toIterable(collection),
             length = iterable.length;
@@ -5154,12 +5267,12 @@
           }
         }
       } else {
-        iterator = (noIterator && isStr)
+        iteratee = (noIteratee && isStr)
           ? charAtCallback
-          : getCallback(iterator, thisArg, 3);
+          : getCallback(iteratee, thisArg, 3);
 
         baseEach(collection, function(value, index, collection) {
-          var current = iterator(value, index, collection);
+          var current = iteratee(value, index, collection);
           if (current < computed || (current === Infinity && current === result)) {
             computed = current;
             result = value;
@@ -5242,10 +5355,10 @@
 
     /**
      * Reduces a collection to a value which is the accumulated result of running
-     * each element in the collection through `iterator`, where each successive
+     * each element in the collection through `iteratee`, where each successive
      * execution consumes the return value of the previous execution. If `accumulator`
      * is not provided the first element of the collection is used as the initial
-     * value. The `iterator` is bound to `thisArg`and invoked with four arguments;
+     * value. The `iteratee` is bound to `thisArg`and invoked with four arguments;
      * (accumulator, value, index|key, collection).
      *
      * @static
@@ -5253,9 +5366,9 @@
      * @alias foldl, inject
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
+     * @param {Function} [iteratee=identity] The function called per iteration.
      * @param {*} [accumulator] The initial value.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the accumulated value.
      * @example
      *
@@ -5266,11 +5379,11 @@
      *   result[key] = n * 3;
      *   return result;
      * }, {});
-     * // => { 'a': 3, 'b': 6, 'c': 9 }
+     * // => { 'a': 3, 'b': 6, 'c': 9 } (property order is not guaranteed)
      */
-    function reduce(collection, iterator, accumulator, thisArg) {
+    function reduce(collection, iteratee, accumulator, thisArg) {
       var func = isArray(collection) ? arrayReduce : baseReduce;
-      return func(collection, getCallback(iterator, thisArg, 4), accumulator, arguments.length < 3, baseEach);
+      return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEach);
     }
 
     /**
@@ -5282,9 +5395,9 @@
      * @alias foldr
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
+     * @param {Function} [iteratee=identity] The function called per iteration.
      * @param {*} [accumulator] The initial value.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the accumulated value.
      * @example
      *
@@ -5292,9 +5405,9 @@
      * _.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []);
      * // => [4, 5, 2, 3, 0, 1]
      */
-    function reduceRight(collection, iterator, accumulator, thisArg) {
+    function reduceRight(collection, iteratee, accumulator, thisArg) {
       var func = isArray(collection) ? arrayReduceRight : baseReduce;
-      return func(collection, getCallback(iterator, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
+      return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
     }
 
     /**
@@ -5336,8 +5449,12 @@
      * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }]
      */
     function reject(collection, predicate, thisArg) {
+      var func = isArray(collection) ? arrayFilter : baseFilter;
+
       predicate = getCallback(predicate, thisArg, 3);
-      return filter(collection, negate(predicate));
+      return func(collection, function(value, index, collection) {
+        return !predicate(value, index, collection);
+      });
     }
 
     /**
@@ -5471,27 +5588,27 @@
      * // => false
      */
     function some(collection, predicate, thisArg) {
+      var func = isArray(collection) ? arraySome : baseSome;
       if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
         predicate = getCallback(predicate, thisArg, 3);
       }
-      var func = isArray(collection) ? arraySome : baseSome;
       return func(collection, predicate);
     }
 
     /**
      * Creates an array of elements, sorted in ascending order by the results of
-     * running each element in a collection through `iterator`. This method performs
+     * running each element in a collection through `iteratee`. This method performs
      * a stable sort, that is, it preserves the original sort order of equal elements.
-     * The `iterator` is bound to `thisArg` and invoked with three arguments;
+     * The `iteratee` is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an array of property names is provided for `iterator` the collection
+     * If an array of property names is provided for `iteratee` the collection
      * is sorted by each property value.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -5499,10 +5616,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Array|Function|Object|string} [iterator=identity] The function
+     * @param {Array|Function|Object|string} [iteratee=identity] The function
      *  called per iteration. If property name(s) or an object is provided it
      *  is used to create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the new sorted array.
      * @example
      *
@@ -5527,28 +5644,28 @@
      * _.map(_.sortBy(characters, ['name', 'age']), _.values);
      * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
      */
-    function sortBy(collection, iterator, thisArg) {
+    function sortBy(collection, iteratee, thisArg) {
       var index = -1,
           length = collection ? collection.length : 0,
-          multi = iterator && isArray(iterator),
+          multi = iteratee && isArray(iteratee),
           result = [];
 
       if (typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER) {
         result.length = length;
       }
       if (!multi) {
-        iterator = getCallback(iterator, thisArg, 3);
+        iteratee = getCallback(iteratee, thisArg, 3);
       }
       baseEach(collection, function(value, key, collection) {
         if (multi) {
-          var length = iterator.length,
+          var length = iteratee.length,
               criteria = Array(length);
 
           while (length--) {
-            criteria[length] = value[iterator[length]];
+            criteria[length] = value == null ? undefined : value[iteratee[length]];
           }
         } else {
-          criteria = iterator(value, key, collection);
+          criteria = iteratee(value, key, collection);
         }
         result[++index] = { 'criteria': criteria, 'index': index, 'value': value };
       });
@@ -5579,7 +5696,7 @@
       if (typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER) {
         return (support.unindexedChars && isString(collection))
           ? collection.split('')
-          : slice(collection);
+          : baseSlice(collection);
       }
       return values(collection);
     }
@@ -5687,7 +5804,7 @@
      * and prepends any additional `bind` arguments to those provided to the bound
      * function.
      *
-     * Note: Unlike native `Function#bind` this method does not set the `length`
+     * **Note:** Unlike native `Function#bind` this method does not set the `length`
      * property of bound functions.
      *
      * @static
@@ -5709,12 +5826,12 @@
      */
     function bind(func, thisArg) {
       if (arguments.length < 3) {
-        return createWrapper([func, BIND_FLAG, null, thisArg]);
+        return createWrapper(func, BIND_FLAG, null, thisArg);
       }
       var args = slice(arguments, 2),
-          partialHolders = replaceHolders(args, bind.placeholder);
+          holders = replaceHolders(args, bind.placeholder);
 
-      return basePartial(func, BIND_FLAG | PARTIAL_FLAG, args, partialHolders, thisArg);
+      return basePartial(func, BIND_FLAG | PARTIAL_FLAG, args, holders, thisArg);
     }
 
     /**
@@ -5723,7 +5840,7 @@
      * of method names. If no method names are provided all enumerable function
      * properties, own and inherited, of `object` are bound.
      *
-     * Note: This method does not set the `length` property of bound functions.
+     * **Note:** This method does not set the `length` property of bound functions.
      *
      * @static
      * @memberOf _
@@ -5787,12 +5904,14 @@
      * // => 'hiya fred!'
      */
     function bindKey(object, key) {
-      var data = [key, BIND_FLAG | BIND_KEY_FLAG, null, object];
+      var bitmask = BIND_FLAG | BIND_KEY_FLAG;
       if (arguments.length > 2) {
-        var args = slice(arguments, 2);
-        data.push(args, replaceHolders(args, bindKey.placeholder));
+        var args = slice(arguments, 2),
+            holders = replaceHolders(args, bindKey.placeholder);
       }
-      return createWrapper(data);
+      return args
+        ? createWrapper(key, bitmask, null, object, args, holders)
+        : createWrapper(key, bitmask, null, object);
     }
 
     /**
@@ -5856,7 +5975,7 @@
      * remaining `func` arguments, and so on. The arity of `func` can be specified
      * if `func.length` is not sufficient.
      *
-     * Note: This method does not set the `length` property of curried functions.
+     * **Note:** This method does not set the `length` property of curried functions.
      *
      * @static
      * @memberOf _
@@ -5889,7 +6008,7 @@
      * This method is like `_.curry` except that arguments are applied to `func`
      * in the manner of `_.partialRight` instead of `_.partial`.
      *
-     * Note: This method does not set the `length` property of curried functions.
+     * **Note:** This method does not set the `length` property of curried functions.
      *
      * @static
      * @memberOf _
@@ -5926,7 +6045,7 @@
      * and/or trailing edge of the `wait` timeout. Subsequent calls to the
      * debounced function return the result of the last `func` call.
      *
-     * Note: If `leading` and `trailing` options are `true`, `func` is called on
+     * **Note:** If `leading` and `trailing` options are `true`, `func` is called on
      * the trailing edge of the timeout only if the the debounced function is
      * invoked more than once during the `wait` timeout.
      *
@@ -6247,7 +6366,7 @@
      * prepended to those provided to the new function. This method is similar to
      * `_.bind` except it does **not** alter the `this` binding.
      *
-     * Note: This method does not set the `length` property of partially applied
+     * **Note:** This method does not set the `length` property of partially applied
      * functions.
      *
      * @static
@@ -6265,16 +6384,16 @@
      */
     function partial(func) {
       var args = slice(arguments, 1),
-          partialHolders = replaceHolders(args, partial.placeholder);
+          holders = replaceHolders(args, partial.placeholder);
 
-      return basePartial(func, PARTIAL_FLAG, args, partialHolders);
+      return basePartial(func, PARTIAL_FLAG, args, holders);
     }
 
     /**
      * This method is like `_.partial` except that partially applied arguments
      * are appended to those provided to the new function.
      *
-     * Note: This method does not set the `length` property of partially applied
+     * **Note:** This method does not set the `length` property of partially applied
      * functions.
      *
      * @static
@@ -6303,9 +6422,9 @@
      */
     function partialRight(func) {
       var args = slice(arguments, 1),
-          partialHolders = replaceHolders(args, partialRight.placeholder);
+          holders = replaceHolders(args, partialRight.placeholder);
 
-      return basePartial(func, PARTIAL_RIGHT_FLAG, args, partialHolders);
+      return basePartial(func, PARTIAL_RIGHT_FLAG, args, holders);
     }
 
     /**
@@ -6316,7 +6435,7 @@
      * Subsequent calls to the throttled function return the result of the last
      * `func` call.
      *
-     * Note: If `leading` and `trailing` options are `true`, `func` is called on
+     * **Note:** If `leading` and `trailing` options are `true`, `func` is called on
      * the trailing edge of the timeout only if the the throttled function is
      * invoked more than once during the `wait` timeout.
      *
@@ -6429,7 +6548,7 @@
      * cloning is handled by the method instead. The `customizer` is bound to
      * `thisArg` and invoked with two argument; (value, index|key).
      *
-     * Note: This method is loosely based on the structured clone algorithm. Functions
+     * **Note:** This method is loosely based on the structured clone algorithm. Functions
      * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
      * objects created by constructors other than `Object` are cloned to plain `Object` objects.
      * See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm)
@@ -6492,7 +6611,7 @@
      * is handled by the method instead. The `customizer` is bound to `thisArg`
      * and invoked with two argument; (value, index|key).
      *
-     * Note: This method is loosely based on the structured clone algorithm. Functions
+     * **Note:** This method is loosely based on the structured clone algorithm. Functions
      * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
      * objects created by constructors other than `Object` are cloned to plain `Object` objects.
      * See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm)
@@ -6574,7 +6693,7 @@
      * object for all destination properties that resolve to `undefined`. Once a
      * property is set, additional defaults of the same property are ignored.
      *
-     * Note: See the [documentation example of `_.partialRight`](http://lodash.com/docs#partialRight)
+     * **Note:** See the [documentation example of `_.partialRight`](http://lodash.com/docs#partialRight)
      * for a deep version of this method.
      *
      * @static
@@ -6592,7 +6711,7 @@
       if (object == null) {
         return object;
       }
-      var args = slice(arguments);
+      var args = baseSlice(arguments);
       args.push(assignDefaults);
       return assign.apply(undefined, args);
     }
@@ -6628,7 +6747,7 @@
      * _.findKey(characters, function(chr) {
      *   return chr.age < 40;
      * });
-     * // => 'barney' (property order is not guaranteed across environments)
+     * // => 'barney' (property order is not guaranteed)
      *
      * // using "_.where" callback shorthand
      * _.findKey(characters, { 'age': 1 });
@@ -6691,7 +6810,7 @@
 
     /**
      * Iterates over own and inherited enumerable properties of an object executing
-     * `iterator` for each property. The `iterator` is bound to `thisArg` and invoked
+     * `iteratee` for each property. The `iteratee` is bound to `thisArg` and invoked
      * with three arguments; (value, key, object). Iterator functions may exit
      * iteration early by explicitly returning `false`.
      *
@@ -6699,8 +6818,8 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -6714,13 +6833,13 @@
      * _.forIn(new Shape, function(value, key) {
      *   console.log(key);
      * });
-     * // => logs 'x', 'y', and 'z' (property order is not guaranteed across environments)
+     * // => logs 'x', 'y', and 'z' (property order is not guaranteed)
      */
-    function forIn(object, iterator, thisArg) {
-      if (typeof iterator != 'function' || typeof thisArg != 'undefined') {
-        iterator = baseCallback(iterator, thisArg, 3);
+    function forIn(object, iteratee, thisArg) {
+      if (typeof iteratee != 'function' || typeof thisArg != 'undefined') {
+        iteratee = baseCallback(iteratee, thisArg, 3);
       }
-      return baseFor(object, iterator, keysIn);
+      return baseFor(object, iteratee, keysIn);
     }
 
     /**
@@ -6731,8 +6850,8 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -6748,14 +6867,14 @@
      * });
      * // => logs 'z', 'y', and 'x' assuming `_.forIn ` logs 'x', 'y', and 'z'
      */
-    function forInRight(object, iterator, thisArg) {
-      iterator = baseCallback(iterator, thisArg, 3);
-      return baseForRight(object, iterator, keysIn);
+    function forInRight(object, iteratee, thisArg) {
+      iteratee = baseCallback(iteratee, thisArg, 3);
+      return baseForRight(object, iteratee, keysIn);
     }
 
     /**
-     * Iterates over own enumerable properties of an object executing `iterator`
-     * for each property. The `iterator` is bound to `thisArg` and invoked with
+     * Iterates over own enumerable properties of an object executing `iteratee`
+     * for each property. The `iteratee` is bound to `thisArg` and invoked with
      * three arguments; (value, key, object). Iterator functions may exit iteration
      * early by explicitly returning `false`.
      *
@@ -6763,21 +6882,21 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
      * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(n, key) {
      *   console.log(key);
      * });
-     * // => logs '0', '1', and 'length' (property order is not guaranteed across environments)
+     * // => logs '0', '1', and 'length' (property order is not guaranteed)
      */
-    function forOwn(object, iterator, thisArg) {
-      if (typeof iterator != 'function' || typeof thisArg != 'undefined') {
-        iterator = baseCallback(iterator, thisArg, 3);
+    function forOwn(object, iteratee, thisArg) {
+      if (typeof iteratee != 'function' || typeof thisArg != 'undefined') {
+        iteratee = baseCallback(iteratee, thisArg, 3);
       }
-      return baseForOwn(object, iterator);
+      return baseForOwn(object, iteratee);
     }
 
     /**
@@ -6788,8 +6907,8 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -6798,9 +6917,9 @@
      * });
      * // => logs 'length', '1', and '0' assuming `_.forOwn` logs '0', '1', and 'length'
      */
-    function forOwnRight(object, iterator, thisArg) {
-      iterator = baseCallback(iterator, thisArg, 3);
-      return baseForRight(object, iterator, keys);
+    function forOwnRight(object, iteratee, thisArg) {
+      iteratee = baseCallback(iteratee, thisArg, 3);
+      return baseForRight(object, iteratee, keys);
     }
 
     /**
@@ -6812,14 +6931,14 @@
      * @alias methods
      * @category Object
      * @param {Object} object The object to inspect.
-     * @returns {Array} Returns the new sorted array of property names.
+     * @returns {Array} Returns the new array of property names.
      * @example
      *
      * _.functions(_);
      * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
      */
     function functions(object) {
-      return baseFunctions(object, keysIn);
+      return baseFunctions(object, keysIn(object));
     }
 
     /**
@@ -6999,7 +7118,7 @@
      */
     function isElement(value) {
       return (value && typeof value == 'object' && value.nodeType === 1 &&
-        (support.nodeClass ? toString.call(value).indexOf('Element') > -1 : isNode(value))) || false;
+        (support.nodeClass ? toString.call(value).indexOf('Element') > -1 : isHostObject(value))) || false;
     }
     // fallback for environments without DOM support
     if (!support.dom) {
@@ -7056,7 +7175,7 @@
      * instead. The `customizer` is bound to `thisArg` and invoked with three
      * arguments; (value, other, key).
      *
-     * Note: This method supports comparing arrays, booleans, `Date` objects,
+     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
      * numbers, `Object` objects, regexes, and strings. Functions and DOM nodes
      * are **not** supported. Provide a customizer function to extend support
      * for comparing other values.
@@ -7119,7 +7238,7 @@
     /**
      * Checks if `value` is a finite primitive number.
      *
-     * Note: This method is based on ES6 `Number.isFinite`. See the
+     * **Note:** This method is based on ES6 `Number.isFinite`. See the
      * [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.isfinite)
      * for more details.
      *
@@ -7181,7 +7300,7 @@
      * Checks if `value` is the language type of `Object`.
      * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
      *
-     * Note: See the [ES5 spec](http://es5.github.io/#x8) for more details.
+     * **Note:** See the [ES5 spec](http://es5.github.io/#x8) for more details.
      *
      * @static
      * @memberOf _
@@ -7209,7 +7328,7 @@
     /**
      * Checks if `value` is `NaN`.
      *
-     * Note: This method is not the same as native `isNaN` which returns `true`
+     * **Note:** This method is not the same as native `isNaN` which returns `true`
      * for `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
      * for more details.
      *
@@ -7238,6 +7357,27 @@
       return isNumber(value) && value != +value;
     }
 
+    /**
+     * Checks if `value` is a native function.
+     *
+     * @static
+     * @memberOf _
+     * @category Object
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+     */
+    function isNative(value) {
+      if (isFunction(value)) {
+        return reNative.test(fnToString.call(value));
+      }
+      if (value && typeof value == 'object') {
+        return !('constructor' in value) && isHostObject(value)
+          ? reNative.test(value)
+          : reHostCtor.test(toString.call(value));
+      }
+      return false;
+    }
+
     /**
      * Checks if `value` is `null`.
      *
@@ -7261,7 +7401,7 @@
     /**
      * Checks if `value` is classified as a `Number` primitive or object.
      *
-     * Note: To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
+     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
      * as numbers, use the `_.isFinite` method.
      *
      * @static
@@ -7290,7 +7430,7 @@
      * Checks if `value` is an object created by the `Object` constructor or has
      * a `[[Prototype]]` of `null`.
      *
-     * Note: This method assumes objects created by the `Object` constructor
+     * **Note:** This method assumes objects created by the `Object` constructor
      * have no inherited enumerable properties.
      *
      * @static
@@ -7408,7 +7548,7 @@
      * Shape.prototype.z = 0;
      *
      * _.keys(new Shape);
-     * // => ['x', 'y'] (property order is not guaranteed across environments)
+     * // => ['x', 'y'] (property order is not guaranteed)
      */
     var keys = !nativeKeys ? shimKeys : function(object) {
       object = toObject(object);
@@ -7442,7 +7582,7 @@
      * Shape.prototype.z = 0;
      *
      * _.keysIn(new Shape);
-     * // => ['x', 'y', 'z'] (property order is not guaranteed across environments)
+     * // => ['x', 'y', 'z'] (property order is not guaranteed)
      */
     function keysIn(object) {
       if (object == null) {
@@ -7500,14 +7640,14 @@
 
     /**
      * Creates an object with the same keys as `object` and values generated by
-     * running each own enumerable property of `object` through `iterator`. The
-     * iterator function is bound to `thisArg` and invoked with three arguments;
+     * running each own enumerable property of `object` through `iteratee`. The
+     * iteratee function is bound to `thisArg` and invoked with three arguments;
      * (value, key, object).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -7515,10 +7655,10 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the new mapped object.
      * @example
      *
@@ -7534,12 +7674,12 @@
      * _.mapValues(characters, 'age');
      * // => { 'fred': 40, 'pebbles': 1 }
      */
-    function mapValues(object, iterator, thisArg) {
+    function mapValues(object, iteratee, thisArg) {
       var result = {};
-      iterator = getCallback(iterator, thisArg, 3);
+      iteratee = getCallback(iteratee, thisArg, 3);
 
       baseForOwn(object, function(value, key, object) {
-        result[key] = iterator(value, key, object);
+        result[key] = iteratee(value, key, object);
       });
       return result;
     }
@@ -7628,11 +7768,15 @@
       if (object == null) {
         return {};
       }
-      if (typeof predicate == 'function') {
-        return basePick(object, negate(getCallback(predicate, thisArg, 3)));
+      var iterable = toObject(object);
+      if (typeof predicate != 'function') {
+        var props = arrayMap(baseFlatten(arguments, false, false, 1), String);
+        return pickByArray(iterable, baseDifference(keysIn(iterable), props));
       }
-      var omitProps = baseFlatten(arguments, false, false, 1);
-      return basePick(toObject(object), baseDifference(keysIn(object), arrayMap(omitProps, String)));
+      predicate = getCallback(predicate, thisArg, 3);
+      return pickByCallback(iterable, function(value, key, object) {
+        return !predicate(value, key, object);
+      });
     }
 
     /**
@@ -7647,7 +7791,7 @@
      * @example
      *
      * _.pairs({ 'barney': 36, 'fred': 40 });
-     * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments)
+     * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed)
      */
     function pairs(object) {
       var index = -1,
@@ -7693,18 +7837,17 @@
       if (object == null) {
         return {};
       }
-      return basePick(toObject(object),
-        typeof predicate == 'function'
-          ? getCallback(predicate, thisArg, 3)
-          : baseFlatten(arguments, false, false, 1)
-      );
+      var iterable = toObject(object);
+      return typeof predicate == 'function'
+        ? pickByCallback(iterable, getCallback(predicate, thisArg, 3))
+        : pickByArray(iterable, baseFlatten(arguments, false, false, 1));
     }
 
     /**
      * An alternative to `_.reduce`; this method transforms `object` to a new
      * `accumulator` object which is the result of running each of its own
-     * enumerable properties through `iterator`, with each execution potentially
-     * mutating the `accumulator` object. The `iterator` is bound to `thisArg`
+     * enumerable properties through `iteratee`, with each execution potentially
+     * mutating the `accumulator` object. The `iteratee` is bound to `thisArg`
      * and invoked with four arguments; (accumulator, value, key, object). Iterator
      * functions may exit iteration early by explicitly returning `false`.
      *
@@ -7712,9 +7855,9 @@
      * @memberOf _
      * @category Object
      * @param {Array|Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
+     * @param {Function} [iteratee=identity] The function called per iteration.
      * @param {*} [accumulator] The custom accumulator value.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the accumulated value.
      * @example
      *
@@ -7731,7 +7874,7 @@
      * });
      * // => { 'a': 3, 'b': 6, 'c': 9 }
      */
-    function transform(object, iterator, accumulator, thisArg) {
+    function transform(object, iteratee, accumulator, thisArg) {
       var isArr = isArrayLike(object);
 
       if (accumulator == null) {
@@ -7745,10 +7888,10 @@
           accumulator = baseCreate(proto);
         }
       }
-      if (iterator) {
-        iterator = getCallback(iterator, thisArg, 4);
+      if (iteratee) {
+        iteratee = getCallback(iteratee, thisArg, 4);
         (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
-          return iterator(accumulator, value, index, object);
+          return iteratee(accumulator, value, index, object);
         });
       }
       return accumulator;
@@ -7772,7 +7915,7 @@
      * Shape.prototype.z = 0;
      *
      * _.values(new Shape(2, 1));
-     * // => [2, 1] (property order is not guaranteed across environments)
+     * // => [2, 1] (property order is not guaranteed)
      */
     function values(object) {
       return baseValues(object, keys);
@@ -7797,7 +7940,7 @@
      * Shape.prototype.z = 0;
      *
      * _.valuesIn(new Shape(2, 1));
-     * // => [2, 1, 0] (property order is not guaranteed across environments)
+     * // => [2, 1, 0] (property order is not guaranteed)
      */
     function valuesIn(object) {
       return baseValues(object, keysIn);
@@ -7888,7 +8031,7 @@
      * Converts the characters "&", "<", ">", '"', and "'" in `string` to
      * their corresponding HTML entities.
      *
-     * Note: No other characters are escaped. To escape additional characters
+     * **Note:** No other characters are escaped. To escape additional characters
      * use a third-party library like [_he_](http://mths.be/he).
      *
      * When working with HTML you should always quote attribute values to reduce
@@ -8155,7 +8298,7 @@
      * properties may be accessed as free variables in the template. If a setting
      * object is provided it overrides `_.templateSettings` for the template.
      *
-     * Note: In the development build `_.template` utilizes sourceURLs for easier debugging.
+     * **Note:** In the development build `_.template` utilizes sourceURLs for easier debugging.
      * See the [HTML5 Rocks article on sourcemaps](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
      * for more details.
      *
@@ -8517,7 +8660,7 @@
      * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to their
      * corresponding characters.
      *
-     * Note: No other HTML entities are unescaped. To unescape additional HTML
+     * **Note:** No other HTML entities are unescaped. To unescape additional HTML
      * entities use a third-party library like [_he_](http://mths.be/he).
      *
      * @static
@@ -8575,6 +8718,7 @@
      *
      * @static
      * @memberOf _
+     * @alias iteratee
      * @category Utility
      * @param {*} [func=identity] The value to convert to a callback.
      * @param {*} [thisArg] The `this` binding of the created callback.
@@ -8691,7 +8835,7 @@
         var isStrict = isStrictComparable(value);
 
         flags[index] = isStrict;
-        vals[index] = isStrict ? value : baseClone(value, false);
+        vals[index] = isStrict ? value : baseClone(value);
       }
       return function(object) {
         index = length;
@@ -8748,16 +8892,20 @@
      */
     function mixin(object, source, options) {
       var chain = true,
-          methodNames = source && baseFunctions(source, keys);
+          isObj = isObject(source),
+          noOpts = options == null,
+          props = noOpts && isObj && keys(source),
+          methodNames = props && baseFunctions(source, props);
 
-      if (!source || (!options && !methodNames.length)) {
-        if (options == null) {
+      if ((props && props.length && !methodNames.length) || (noOpts && !isObj)) {
+        if (noOpts) {
           options = source;
         }
+        methodNames = false;
         source = object;
         object = this;
-        methodNames = baseFunctions(source, keys);
       }
+      methodNames || (methodNames = baseFunctions(source, keys(source)));
       if (options === false) {
         chain = false;
       } else if (isObject(options) && 'chain' in options) {
@@ -8765,7 +8913,7 @@
       }
       var index = -1,
           isFunc = isFunction(object),
-          length = methodNames ? methodNames.length : 0;
+          length = methodNames.length;
 
       while (++index < length) {
         var methodName = methodNames[index],
@@ -8849,7 +8997,7 @@
      * `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal,
      * in which case a `radix` of `16` is used.
      *
-     * Note: This method avoids differences in native ES3 and ES5 `parseInt`
+     * **Note:** This method avoids differences in native ES3 and ES5 `parseInt`
      * implementations. See the [ES5 spec](http://es5.github.io/#E)
      * for more details.
      *
@@ -9077,16 +9225,16 @@
     }
 
     /**
-     * Executes the iterator function `n` times, returning an array of the results
-     * of each execution. The `iterator` is bound to `thisArg` and invoked with
+     * Executes the iteratee function `n` times, returning an array of the results
+     * of each execution. The `iteratee` is bound to `thisArg` and invoked with
      * one argument; (index).
      *
      * @static
      * @memberOf _
      * @category Utility
-     * @param {number} n The number of times to execute `iterator`.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {number} n The number of times to execute `iteratee`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the array of results.
      * @example
      *
@@ -9099,18 +9247,18 @@
      * _.times(3, function(n) { this.cast(n); }, mage);
      * // => also calls `mage.castSpell(n)` three times
      */
-    function times(n, iterator, thisArg) {
+    function times(n, iteratee, thisArg) {
       n = nativeIsFinite(n = +n) && n > -1 ? n : 0;
-      iterator = baseCallback(iterator, thisArg, 1);
+      iteratee = baseCallback(iteratee, thisArg, 1);
 
       var index = -1,
           result = Array(nativeMin(n, MAX_ARRAY_LENGTH));
 
       while (++index < n) {
         if (index < MAX_ARRAY_LENGTH) {
-          result[index] = iterator(index);
+          result[index] = iteratee(index);
         } else {
-          iterator(index);
+          iteratee(index);
         }
       }
       return result;
@@ -9241,6 +9389,7 @@
     lodash.each = forEach;
     lodash.eachRight = forEachRight;
     lodash.extend = assign;
+    lodash.iteratee = callback;
     lodash.methods = functions;
     lodash.object = zipObject;
     lodash.select = filter;
@@ -9285,6 +9434,7 @@
     lodash.isFinite = isFinite;
     lodash.isFunction = isFunction;
     lodash.isNaN = isNaN;
+    lodash.isNative = isNative;
     lodash.isNull = isNull;
     lodash.isNumber = isNumber;
     lodash.isObject = isObject;
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index 359d9fb81..1f6ea7fcd 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -3,73 +3,74 @@
  * Lo-Dash 3.0.0-pre (Custom Build) lodash.com/license | Underscore.js 1.6.0 underscorejs.org/LICENSE
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
-;(function(){function n(n,t){for(var r=-1,e=t.length,u=Array(e);++r<e;)u[r]=n[t[r]];return u}function t(n,t){if(n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return 0}function r(n,t,r){r=(r||0)-1;for(var e=n?n.length:0;++r<e;)if(n[r]===t)return r;return-1}function e(n,t){return n.has(t)?0:-1}function u(n){return n.charCodeAt(0)}function o(n,t){for(var r=-1,e=n.length;++r<e&&-1<t.indexOf(n.charAt(r)););return r}function i(n,t){for(var r=n.length;r--&&-1<t.indexOf(n.charAt(r)););return r
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+}),t.source=l,we(t))throw t;return t},g.trim=Fe,g.trimLeft=function(n,t){return(n=null==n?"":Xe(n))?null==t?n.slice(v(n)):(t=Xe(t),n.slice(i(n,t))):n},g.trimRight=function(n,t){return(n=null==n?"":Xe(n))?null==t?n.slice(0,y(n)+1):(t=Xe(t),n.slice(0,a(n,t)+1)):n},g.trunc=function(n,t){var r=30,e="...";if(Ae(t))var u="separator"in t?t.separator:u,r="length"in t?+t.length||0:r,e="omission"in t?Xe(t.omission):e;else null!=t&&(r=+t||0);if(n=null==n?"":Xe(n),r>=n.length)return n;var o=r-e.length;if(1>o)return e;
+if(r=n.slice(0,o),null==u)return r+e;if(Ee(u)){if(n.slice(o).search(u)){var i,a,f=n.slice(0,o);for(u.global||(u=Je(u.source,(K.exec(u)||"")+"g")),u.lastIndex=0;i=u.exec(f);)a=i.index;r=r.slice(0,null==a?o:a)}}else n.indexOf(u,o)!=o&&(u=r.lastIndexOf(u),-1<u&&(r=r.slice(0,u)));return r+e},g.unescape=function(n){return n=null==n?"":Xe(n),B.lastIndex=0,B.test(n)?n.replace(B,d):n},g.uniqueId=function(n){var t=++L;return Xe(null==n?"":n)+t},g.all=Hr,g.any=le,g.detect=ne,g.foldl=ie,g.foldr=ae,g.head=Dr,g.include=Gr,g.inject=ie,Pe(g,function(){var n={};
+return nr(g,function(t,r){g.prototype[r]||(n[r]=t)}),n}(),false),g.sample=function(n,t,r){return null==t||r?(n=Pr(n),t=n.length,0<t?n[fr(0,t-1)]:_):(n=fe(n),n.length=Cu(0>t?0:+t||0,n.length),n)},nr(g,function(n,t){var r="sample"!=t;g.prototype[t]||(g.prototype[t]=function(t,e){var u=this.__chain__,o=n(this.__wrapped__,t,e);return u||null!=t&&(!e||r&&typeof t=="function")?new X(o,u):o})}),g.VERSION=b,g.prototype.chain=function(){return this.__chain__=true,this},g.prototype.toJSON=Xr,g.prototype.toString=function(){return Xe(this.__wrapped__)
+},g.prototype.value=Xr,g.prototype.valueOf=Xr,tt(["join","pop","shift"],function(n){var t=He[n];g.prototype[n]=function(){var n=this.__chain__,r=t.apply(this.__wrapped__,arguments);return n?new X(r,n):r}}),tt(["push","reverse","sort","unshift"],function(n){var t=He[n];g.prototype[n]=function(){return t.apply(this.__wrapped__,arguments),this}}),tt(["concat","splice"],function(n){var t=He[n];g.prototype[n]=function(){return new X(t.apply(this.__wrapped__,arguments),this.__chain__)}}),Nu.spliceObjects||tt(["pop","shift","splice"],function(n){var t=He[n],r="splice"==n;
+g.prototype[n]=function(){var n=this.__chain__,e=this.__wrapped__,u=t.apply(e,arguments);return 0===e.length&&delete e[0],n||r?new X(u,n):u}}),g}var _,b="3.0.0-pre",w=1,j=2,A=4,x=8,O=16,E=32,I=64,C=150,S=16,k="__lodash_"+b.replace(/[-.]/g,"_")+"__",R="Expected a function",F=Math.pow(2,32)-1,U=Math.pow(2,53)-1,T="__lodash_placeholder__",L=0,W=/^[A-Z]+$/,N=/\b__p\+='';/g,P=/\b(__p\+=)''\+/g,$=/(__e\(.*?\)|\b__t\))\+'';/g,B=/&(?:amp|lt|gt|quot|#39|#96);/g,D=/[&<>"'`]/g,M=/<%-([\s\S]+?)%>/g,z=/<%([\s\S]+?)%>/g,q=/<%=([\s\S]+?)%>/g,Z=/\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g,K=/\w*$/,V=/^\s*function[ \n\r\t]+\w/,Y=/^0[xX]/,J=/^\[object .+?Constructor\]$/,X=/[\xC0-\xFF]/g,G=/($^)/,H=/[.*+?^${}()|[\]\/\\]/g,Q=/\bthis\b/,nt=/['\n\r\u2028\u2029\\]/g,tt=/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g,rt=" \t\x0B\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000",et="Array ArrayBuffer Date Error Float32Array Float64Array Function Int8Array Int16Array Int32Array Math Number Object RegExp Set String _ clearTimeout document isFinite parseInt setTimeout TypeError Uint8Array Uint8ClampedArray Uint16Array Uint32Array WeakMap window WinRTError".split(" "),ut="constructor hasOwnProperty isPrototypeOf propertyIsEnumerable toLocaleString toString valueOf".split(" "),ot="[object Arguments]",it="[object Array]",at="[object Boolean]",ft="[object Date]",lt="[object Error]",ct="[object Function]",st="[object Number]",pt="[object Object]",ht="[object RegExp]",gt="[object String]",vt="[object ArrayBuffer]",yt="[object Float32Array]",dt="[object Float64Array]",mt="[object Int8Array]",_t="[object Int16Array]",bt="[object Int32Array]",wt="[object Uint8Array]",jt="[object Uint8ClampedArray]",At="[object Uint16Array]",xt="[object Uint32Array]",Ot={};
+Ot[ot]=Ot[it]=Ot[yt]=Ot[dt]=Ot[mt]=Ot[_t]=Ot[bt]=Ot[wt]=Ot[jt]=Ot[At]=Ot[xt]=true,Ot[vt]=Ot[at]=Ot[ft]=Ot[lt]=Ot[ct]=Ot["[object Map]"]=Ot[st]=Ot[pt]=Ot[ht]=Ot["[object Set]"]=Ot[gt]=Ot["[object WeakMap]"]=false;var Et={};Et[ot]=Et[it]=Et[vt]=Et[at]=Et[ft]=Et[yt]=Et[dt]=Et[mt]=Et[_t]=Et[bt]=Et[st]=Et[pt]=Et[ht]=Et[gt]=Et[wt]=Et[jt]=Et[At]=Et[xt]=true,Et[lt]=Et[ct]=Et["[object Map]"]=Et["[object Set]"]=Et["[object WeakMap]"]=false;var It={leading:false,maxWait:0,trailing:false},Ct={configurable:false,enumerable:false,value:null,writable:false},St={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;","`":"&#96;"},kt={"&amp;":"&","&lt;":"<","&gt;":">","&quot;":'"',"&#39;":"'","&#96;":"`"},Rt={"\xc0":"A","\xc1":"A","\xc2":"A","\xc3":"A","\xc4":"A","\xc5":"A","\xe0":"a","\xe1":"a","\xe2":"a","\xe3":"a","\xe4":"a","\xe5":"a","\xc7":"C","\xe7":"c","\xd0":"D","\xf0":"d","\xc8":"E","\xc9":"E","\xca":"E","\xcb":"E","\xe8":"e","\xe9":"e","\xea":"e","\xeb":"e","\xcc":"I","\xcd":"I","\xce":"I","\xcf":"I","\xec":"i","\xed":"i","\xee":"i","\xef":"i","\xd1":"N","\xf1":"n","\xd2":"O","\xd3":"O","\xd4":"O","\xd5":"O","\xd6":"O","\xd8":"O","\xf2":"o","\xf3":"o","\xf4":"o","\xf5":"o","\xf6":"o","\xf8":"o","\xd9":"U","\xda":"U","\xdb":"U","\xdc":"U","\xf9":"u","\xfa":"u","\xfb":"u","\xfc":"u","\xdd":"Y","\xfd":"y","\xff":"y","\xc6":"AE","\xe6":"ae","\xde":"Th","\xfe":"th","\xdf":"ss","\xd7":" ","\xf7":" "},Ft={"function":true,object:true},Ut={"\\":"\\","'":"'","\n":"n","\r":"r","\u2028":"u2028","\u2029":"u2029"},Tt=Ft[typeof window]&&window||this,Lt=Ft[typeof exports]&&exports&&!exports.nodeType&&exports,Ft=Ft[typeof module]&&module&&!module.nodeType&&module,Wt=Lt&&Ft&&typeof global=="object"&&global;
+!Wt||Wt.global!==Wt&&Wt.window!==Wt&&Wt.self!==Wt||(Tt=Wt);var Wt=Ft&&Ft.exports===Lt&&Lt,Nt=m();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(Tt._=Nt, define(function(){return Nt})):Lt&&Ft?Wt?(Ft.exports=Nt)._=Nt:Lt._=Nt:Tt._=Nt}).call(this);
\ No newline at end of file
diff --git a/dist/lodash.js b/dist/lodash.js
index c4f291d03..97228c370 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -24,6 +24,10 @@
       PARTIAL_FLAG = 32,
       PARTIAL_RIGHT_FLAG = 64;
 
+  /** Used to detect when a function becomes hot */
+  var HOT_COUNT = 150,
+      HOT_SPAN = 16;
+
   /** Used as the property name for wrapper metadata */
   var EXPANDO = '__lodash_' + VERSION.replace(/[-.]/g, '_') + '__';
 
@@ -122,7 +126,8 @@
     'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Math', 'Number',
     'Object', 'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document',
     'isFinite', 'parseInt', 'setTimeout', 'TypeError', 'Uint8Array',
-    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'window', 'WinRTError'
+    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
+    'window', 'WinRTError'
   ];
 
   /** Used to make template sourceURLs easier to identify */
@@ -202,7 +207,7 @@
   /**
    * Used to convert characters to HTML entities.
    *
-   * Note: Though the ">" character is escaped for symmetry, characters like
+   * **Note:** Though the ">" character is escaped for symmetry, characters like
    * ">" and "/" don't require escaping in HTML and have no special meaning
    * unless they're part of a tag or unquoted attribute value.
    * See [Mathias' article](http://mathiasbynens.be/notes/ambiguous-ampersands)
@@ -345,16 +350,37 @@
    */
   function baseIndexOf(array, value, fromIndex) {
     var index = (fromIndex || 0) - 1,
-        length = array ? array.length : 0;
+        length = array ? array.length : 0,
+        isReflexive = value === value;
 
     while (++index < length) {
-      if (array[index] === value) {
+      var other = array[index];
+      if ((isReflexive ? other === value : other !== other)) {
         return index;
       }
     }
     return -1;
   }
 
+  /**
+   * The base implementation of `_.slice` without support for `start` and `end`
+   * arguments.
+   *
+   * @private
+   * @param {Array} array The array to slice.
+   * @returns {Array} Returns the slice of `array`.
+   */
+  function baseSlice(array) {
+    var index = -1,
+        length = array ? array.length : 0,
+        result = Array(length);
+
+    while (++index < length) {
+      result[index] = array[index];
+    }
+    return result;
+  }
+
   /**
    * An implementation of `_.contains` for cache objects that mimics the return
    * signature of `_.indexOf` by returning `0` if the value is found, else `-1`.
@@ -393,7 +419,7 @@
     var index = -1,
         length = string.length;
 
-    while (++index < length && chars.indexOf(string.charAt(index)) > -1) { }
+    while (++index < length && chars.indexOf(string.charAt(index)) > -1) {}
     return index;
   }
 
@@ -409,7 +435,7 @@
   function charsRightIndex(string, chars) {
     var index = string.length;
 
-    while (index-- && chars.indexOf(string.charAt(index)) > -1) { }
+    while (index-- && chars.indexOf(string.charAt(index)) > -1) {}
     return index;
   }
 
@@ -538,7 +564,7 @@
     var index = -1,
         length = string.length;
 
-    while (++index < length && isWhitespace(string.charCodeAt(index))) { }
+    while (++index < length && isWhitespace(string.charCodeAt(index))) {}
     return index;
   }
 
@@ -553,7 +579,7 @@
   function trimmedRightIndex(string) {
     var index = string.length;
 
-    while (index-- && isWhitespace(string.charCodeAt(index))) { }
+    while (index-- && isWhitespace(string.charCodeAt(index))) {}
     return index;
   }
 
@@ -618,8 +644,7 @@
 
     /** Used for native method references */
     var arrayProto = Array.prototype,
-        objectProto = Object.prototype,
-        stringProto = String.prototype;
+        objectProto = Object.prototype;
 
     /** Used to detect DOM support */
     var document = (document = context.window) && document.document;
@@ -627,6 +652,9 @@
     /** Used to resolve the decompiled source of functions */
     var fnToString = Function.prototype.toString;
 
+    /** Used to check objects for own properties */
+    var hasOwnProperty = objectProto.hasOwnProperty;
+
     /** Used to restore the original `_` reference in `_.noConflict` */
     var oldDash = context._;
 
@@ -646,13 +674,13 @@
         clearTimeout = context.clearTimeout,
         floor = Math.floor,
         getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
-        hasOwnProperty = objectProto.hasOwnProperty,
         push = arrayProto.push,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
         Set = isNative(Set = context.Set) && Set,
         setTimeout = context.setTimeout,
         splice = arrayProto.splice,
-        Uint8Array = isNative(Uint8Array = context.Uint8Array) && Uint8Array;
+        Uint8Array = isNative(Uint8Array = context.Uint8Array) && Uint8Array,
+        WeakMap = isNative(WeakMap = context.WeakMap) && WeakMap;
 
     /** Used to clone array buffers */
     var Float64Array = (function() {
@@ -662,7 +690,7 @@
       try {
         var func = isNative(func = context.Float64Array) && func,
             result = new func(new ArrayBuffer(10), 0, 1) && func;
-      } catch(e) { }
+      } catch(e) {}
       return result;
     }());
 
@@ -673,13 +701,12 @@
         var o = {},
             func = isNative(func = Object.defineProperty) && func,
             result = func(o, o, o) && func;
-      } catch(e) { }
+      } catch(e) {}
       return result;
     }());
 
     /* Native method references for those with the same name as other `lodash` methods */
-    var nativeContains = isNative(nativeContains = stringProto.contains) && nativeContains,
-        nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
+    var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
         nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray,
         nativeIsFinite = context.isFinite,
         nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys,
@@ -693,6 +720,9 @@
     /** Used as the size, in bytes, of each Float64Array element */
     var FLOAT64_BYTES_PER_ELEMENT = Float64Array ? Float64Array.BYTES_PER_ELEMENT : 0;
 
+    /** Used to store function metadata */
+    var metaMap = WeakMap && new WeakMap;
+
     /*--------------------------------------------------------------------------*/
 
     /**
@@ -724,17 +754,17 @@
      *
      * The non-chainable wrapper functions are:
      * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `contains`,
-     * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`,
-     * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`,
-     * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, isDate`,
+     * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`,
+     * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`,
+     * `has`, `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, isDate`,
      * `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`, `isFunction`,
-     * `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`,
-     * `isString`, `isUndefined`, `join`, `kebabCase`, `last`, `lastIndexOf`,
-     * `max`, `min`, `noConflict`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`,
-     * `pop`, `random`, `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`,
-     * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`,
-     * `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`,
-     * `unescape`, `uniqueId`, and `value`
+     * `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`,
+     * `isRegExp`, `isString`, `isUndefined`, `join`, `kebabCase`, `last`,
+     * `lastIndexOf`, `max`, `min`, `noConflict`, `now`, `pad`, `padLeft`,
+     * `padRight`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, `repeat`,
+     * `result`, `runInContext`, `shift`, `size`, `snakeCase`, `some`, `sortedIndex`,
+     * `sortedLastIndex`, `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`,
+     * `trunc`, `unescape`, `uniqueId`, and `value`
      *
      * The wrapper function `sample` will return a wrapped value when `n` is
      * provided, otherwise it will return an unwrapped value.
@@ -799,8 +829,6 @@
 
     (function(x) {
 
-      for (var argsKey in arguments) { }
-
       /**
        * Detect if functions can be decompiled by `Function#toString`
        * (all but Firefox OS certified apps, older Opera mobile browsers, and
@@ -831,6 +859,18 @@
         support.dom = false;
       }
 
+      /**
+       * Detect if the host objects are detectable (IE < 9).
+       *
+       * @memberOf _.support
+       * @type boolean
+       */
+      try {
+        support.hostObject = !({ 'toString': 0 } + '');
+      } catch(e) {
+        support.hostObject = false;
+      }
+
       /**
        * Detect if `arguments` object indexes are non-enumerable.
        *
@@ -844,7 +884,7 @@
        * @type boolean
        */
       try {
-        support.nonEnumArgs = !(hasOwnProperty.call(arguments, 1) && propertyIsEnumerable.call(arguments, 1));
+        support.nonEnumArgs = !propertyIsEnumerable.call(arguments, 1);
       } catch(e) {
         support.nonEnumArgs = true;
       }
@@ -919,15 +959,15 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns `array`.
      */
-    function arrayEach(array, iterator) {
+    function arrayEach(array, iteratee) {
       var index = -1,
           length = array.length;
 
       while (++index < length) {
-        if (iterator(array[index], index, array) === false) {
+        if (iteratee(array[index], index, array) === false) {
           break;
         }
       }
@@ -940,14 +980,14 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns `array`.
      */
-    function arrayEachRight(array, iterator) {
+    function arrayEachRight(array, iteratee) {
       var length = array.length;
 
       while (length--) {
-        if (iterator(array[length], length, array) === false) {
+        if (iteratee(array[length], length, array) === false) {
           break;
         }
       }
@@ -982,16 +1022,16 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns the new mapped array.
      */
-    function arrayMap(array, iterator) {
+    function arrayMap(array, iteratee) {
       var index = -1,
           length = array.length,
           result = Array(length);
 
       while (++index < length) {
-        result[index] = iterator(array[index], index, array);
+        result[index] = iteratee(array[index], index, array);
       }
       return result;
     }
@@ -1008,12 +1048,13 @@
     function arrayFilter(array, predicate) {
       var index = -1,
           length = array.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         var value = array[index];
         if (predicate(value, index, array)) {
-          result.push(value);
+          result[++resIndex] = value;
         }
       }
       return result;
@@ -1025,13 +1066,13 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {*} [accumulator] The initial value.
      * @param {boolean} [initFromArray=false] Specify using the first element of
      *  `array` as the initial value.
      * @returns {*} Returns the accumulated value.
      */
-    function arrayReduce(array, iterator, accumulator, initFromArray) {
+    function arrayReduce(array, iteratee, accumulator, initFromArray) {
       var index = -1,
           length = array.length;
 
@@ -1039,7 +1080,7 @@
         accumulator = array[++index];
       }
       while (++index < length) {
-        accumulator = iterator(accumulator, array[index], index, array);
+        accumulator = iteratee(accumulator, array[index], index, array);
       }
       return accumulator;
     }
@@ -1050,20 +1091,20 @@
      *
      * @private
      * @param {Array} array The array to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {*} [accumulator] The initial value.
      * @param {boolean} [initFromArray=false] Specify using the last element of
      *  `array` as the initial value.
      * @returns {*} Returns the accumulated value.
      */
-    function arrayReduceRight(array, iterator, accumulator, initFromArray) {
+    function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
       var length = array.length;
 
       if (initFromArray && length) {
         accumulator = array[--length];
       }
       while (length--) {
-        accumulator = iterator(accumulator, array[length], length, array);
+        accumulator = iteratee(accumulator, array[length], length, array);
       }
       return accumulator;
     }
@@ -1107,7 +1148,7 @@
     /**
      * Used by `_.template` to customize its `_.assign` use.
      *
-     * Note: This method is like `assignDefaults` except that it ignores
+     * **Note:** This method is like `assignDefaults` except that it ignores
      * inherited property values when checking if a property is `undefined`.
      *
      * @private
@@ -1162,7 +1203,7 @@
 
       while (++index < length) {
         var key = methodNames[index];
-        object[key] = createWrapper([object[key], BIND_FLAG, null, object]);
+        object[key] = createWrapper(object[key], BIND_FLAG, null, object);
       }
       return object;
     }
@@ -1184,7 +1225,7 @@
         if (typeof thisArg == 'undefined') {
           return func;
         }
-        var data = func[EXPANDO];
+        var data = getData(func);
         if (typeof data == 'undefined') {
           if (support.funcNames) {
             data = !func.name;
@@ -1198,7 +1239,7 @@
             if (!data) {
               // checks if `func` references the `this` keyword and stores the result
               data = reThis.test(source) || isNative(func);
-              setData(func, data);
+              baseSetData(func, data);
             }
           }
         }
@@ -1248,75 +1289,15 @@
       if (typeof result != 'undefined') {
         return result;
       }
-      var isArr = isArray(value),
-          isShallow = !isDeep;
-
+      var isArr = isArray(value);
+      result = value;
       if (isArr) {
-        result = isShallow ? slice(value) : value.constructor(value.length);
-
-        // add array properties assigned by `RegExp#exec`
-        if (typeof value[0] == 'string' && hasOwnProperty.call(value, 'index')) {
-          result.index = value.index;
-          result.input = value.input;
-        }
-        if (isShallow) {
-          return result;
-        }
+        result = initArrayClone(value, isDeep);
+      } else if (isObject(value)) {
+        result = initObjectClone(value, isDeep);
+        value = (isDeep && toString.call(result) == objectClass) ? value : result;
       }
-      else {
-        if (!isObject(value)) {
-          return value;
-        }
-        var className = toString.call(value);
-        if (!cloneableClasses[className]) {
-          return value;
-        }
-        var isArgs = className == argsClass,
-            isObj = !isArgs && className == objectClass;
-
-        if (isShallow && (isArgs || isObj)) {
-          result = baseAssign({}, value);
-          if (isObj) {
-            return result;
-          }
-        }
-        var Ctor = value.constructor;
-        if (className == objectClass && !(isFunction(Ctor) && (Ctor instanceof Ctor))) {
-          Ctor = Object;
-        }
-        if (isDeep && (isArgs || isObj)) {
-          result = new Ctor;
-        }
-        else {
-          switch (className) {
-            case arrayBufferClass:
-              return cloneBuffer(value);
-
-            case boolClass:
-            case dateClass:
-              return new Ctor(+value);
-
-            case float32Class: case float64Class:
-            case int8Class: case int16Class: case int32Class:
-            case uint8Class: case uint8ClampedClass: case uint16Class: case uint32Class:
-              var buffer = value.buffer;
-              return new Ctor(isDeep ? cloneBuffer(buffer) : buffer, value.byteOffset, value.length);
-
-            case numberClass:
-            case stringClass:
-              return new Ctor(value);
-
-            case regexpClass:
-              result = Ctor(value.source, reFlags.exec(value));
-              result.lastIndex = value.lastIndex;
-              return result;
-          }
-        }
-      }
-      if (isArgs) {
-        result.length = value.length;
-      }
-      if (isShallow) {
+      if (!isDeep || result === value) {
         return result;
       }
       // check for circular references and return corresponding clone
@@ -1371,85 +1352,6 @@
       }());
     }
 
-    /**
-     * The base implementation of `createWrapper` which creates the wrapper and
-     * sets its metadata.
-     *
-     * @private
-     * @param {Array} data The metadata array. See `createWrapper` for more details.
-     * @returns {Function} Returns the new function.
-     */
-    function baseCreateWrapper(data) {
-      var bitmask = data[1];
-      if (bitmask == BIND_FLAG) {
-        return setData(createBindWrapper(data), data);
-      }
-      var partialHolders = data[5];
-      if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !partialHolders.length) {
-        return setData(createPartialWrapper(data), data);
-      }
-      var func = data[0],
-          arity = data[2],
-          thisArg = data[3],
-          partialArgs = data[4],
-          partialRightArgs = data[6],
-          partialRightHolders = data[7];
-
-      var isBind = bitmask & BIND_FLAG,
-          isBindKey = bitmask & BIND_KEY_FLAG,
-          isCurry = bitmask & CURRY_FLAG,
-          isCurryRight = bitmask & CURRY_RIGHT_FLAG,
-          isCurryBound = bitmask & CURRY_BOUND_FLAG;
-
-      var Ctor = !isBindKey && createCtorWrapper(func),
-          key = func;
-
-      var wrapper = function() {
-        var length = arguments.length,
-            index = length,
-            args = Array(length);
-
-        while (index--) {
-          args[index] = arguments[index];
-        }
-        if (partialArgs) {
-          args = composeArgs(partialArgs, partialHolders, args);
-        }
-        if (partialRightArgs) {
-          args = composeArgsRight(partialRightArgs, partialRightHolders, args);
-        }
-        if (isCurry || isCurryRight) {
-          var placeholder = wrapper.placeholder,
-              newPartialHolders = replaceHolders(args, placeholder);
-
-          length -= newPartialHolders.length;
-
-          if (length < arity) {
-            bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG);
-            bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG);
-
-            if (!isCurryBound) {
-              bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
-            }
-            var newData = [func, bitmask, nativeMax(arity - length, 0), thisArg, null, null];
-            newData[isCurry ? 4 : 6] = args;
-            newData[isCurry ? 5 : 7] = newPartialHolders;
-
-            var result = baseCreateWrapper(newData);
-            result.placeholder = placeholder;
-            return result;
-          }
-        }
-        var thisBinding = isBind ? thisArg : this;
-        if (isBindKey) {
-          func = thisBinding[key];
-        }
-        return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
-      };
-
-      return setData(wrapper, data);
-    }
-
     /**
      * The base implementation of `_.curry` and `_.curryRight` which handles
      * resolving the default arity of `func`.
@@ -1462,9 +1364,9 @@
      */
     function baseCurry(func, bitmask, arity) {
       if (typeof arity != 'number') {
-        arity = +arity || (func ? func.length : 0);
+        arity = arity == null ? (func ? func.length : 0) : nativeMax(+arity || 0, 0);
       }
-      return createWrapper([func, bitmask, arity]);
+      return createWrapper(func, bitmask, arity);
     }
 
     /**
@@ -1497,7 +1399,7 @@
       while (++index < length) {
         var value = array[index];
 
-        if (isCommon) {
+        if (isCommon && value === value) {
           var valuesIndex = valuesLength;
           while (valuesIndex--) {
             if (values[valuesIndex] === value) {
@@ -1519,19 +1421,19 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array|Object|string} Returns `collection`.
      */
-    function baseEach(collection, iterator) {
+    function baseEach(collection, iteratee) {
       var length = collection ? collection.length : 0;
       if (!(typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER)) {
-        return baseForOwn(collection, iterator);
+        return baseForOwn(collection, iteratee);
       }
       var index = -1,
           iterable = toIterable(collection);
 
       while (++index < length) {
-        if (iterator(iterable[index], index, iterable) === false) {
+        if (iteratee(iterable[index], index, iterable) === false) {
           break;
         }
       }
@@ -1544,17 +1446,17 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array|Object|string} Returns `collection`.
      */
-    function baseEachRight(collection, iterator) {
+    function baseEachRight(collection, iteratee) {
       var length = collection ? collection.length : 0;
       if (!(typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER)) {
-        return baseForOwnRight(collection, iterator);
+        return baseForOwnRight(collection, iteratee);
       }
       var iterable = toIterable(collection);
       while (length--) {
-        if (iterator(iterable[length], length, iterable) === false) {
+        if (iteratee(iterable[length], length, iterable) === false) {
           break;
         }
       }
@@ -1668,24 +1570,24 @@
 
     /**
      * The base implementation of `baseForIn` and `baseForOwn` which iterates
-     * over `object` properties returned by `keysFunc` executing `iterator` for
+     * over `object` properties returned by `keysFunc` executing `iteratee` for
      * each property. Iterator functions may exit iteration early by explicitly
      * returning `false`.
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {Function} keysFunc The function to get the keys of `object`.
      * @returns {Object} Returns `object`.
      */
-    function baseFor(object, iterator, keysFunc) {
+    function baseFor(object, iteratee, keysFunc) {
       var index = -1,
           props = keysFunc(object),
           length = props.length;
 
       while (++index < length) {
         var key = props[index];
-        if (iterator(object[key], key, object) === false) {
+        if (iteratee(object[key], key, object) === false) {
           break;
         }
       }
@@ -1698,17 +1600,17 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {Function} keysFunc The function to get the keys of `object`.
      * @returns {Object} Returns `object`.
      */
-    function baseForRight(object, iterator, keysFunc) {
+    function baseForRight(object, iteratee, keysFunc) {
       var props = keysFunc(object),
           length = props.length;
 
       while (length--) {
         var key = props[length];
-        if (iterator(object[key], key, object) === false) {
+        if (iteratee(object[key], key, object) === false) {
           break;
         }
       }
@@ -1721,11 +1623,11 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Object} Returns `object`.
      */
-    function baseForIn(object, iterator) {
-      return baseFor(object, iterator, keysIn);
+    function baseForIn(object, iteratee) {
+      return baseFor(object, iteratee, keysIn);
     }
 
     /**
@@ -1734,11 +1636,11 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Object} Returns `object`.
      */
-    function baseForOwn(object, iterator) {
-      return baseFor(object, iterator, keys);
+    function baseForOwn(object, iteratee) {
+      return baseFor(object, iteratee, keys);
     }
 
     /**
@@ -1747,32 +1649,32 @@
      *
      * @private
      * @param {Object} object The object to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Object} Returns `object`.
      */
-    function baseForOwnRight(object, iterator) {
-      return baseForRight(object, iterator, keys);
+    function baseForOwnRight(object, iteratee) {
+      return baseForRight(object, iteratee, keys);
     }
 
     /**
-     * The base implementation of `_.functions` which creates an array of function
-     * property names from those returned by `keysFunc`.
+     * The base implementation of `_.functions` which creates an array of
+     * `object` function property names filtered from those provided.
      *
      * @private
      * @param {Object} object The object to inspect.
-     * @param {Function} keysFunc The function to get the keys of `object`.
-     * @returns {Array} Returns the new sorted array of property names.
+     * @param {Array} props The property names to filter.
+     * @returns {Array} Returns the new array of filtered property names.
      */
-    function baseFunctions(object, keysFunc) {
+    function baseFunctions(object, props) {
       var index = -1,
-          props = keysFunc(object),
           length = props.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         var key = props[index];
         if (isFunction(object[key])) {
-          result.push(key);
+          result[++resIndex] = key;
         }
       }
       return result;
@@ -1896,7 +1798,7 @@
             return (value != +value)
               ? other != +other
               // but treat `-0` vs. `+0` as not equal
-              : (value == 0 ? (1 / value == 1 / other) : value == +other);
+              : (value == 0 ? ((1 / value) == (1 / other)) : value == +other);
 
           case regexpClass:
           case stringClass:
@@ -1999,14 +1901,14 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @returns {Array} Returns the new mapped array.
      */
-    function baseMap(collection, iterator) {
+    function baseMap(collection, iteratee) {
       var result = [];
 
       baseEach(collection, function(value, key, collection) {
-        result.push(iterator(value, key, collection));
+        result.push(iteratee(value, key, collection));
       });
       return result;
     }
@@ -2089,51 +1991,14 @@
      */
     function basePartial(func, bitmask, args, holders, thisArg) {
       if (func) {
-        var data = func[EXPANDO],
+        var data = getData(func),
             arity = data ? data[2] : func.length;
 
         arity -= args.length;
       }
-      var isPartial = bitmask & PARTIAL_FLAG,
-          newData = [func, bitmask, arity, thisArg, null, null];
-
-      newData[isPartial ? 4 : 6] = args;
-      newData[isPartial ? 5 : 7] = holders;
-      return createWrapper(newData);
-    }
-
-    /**
-     * The base implementation of `_.pick` without support for `this` binding
-     * and individual property name arguments.
-     *
-     * @private
-     * @param {Object} object The source object.
-     * @param {Function|string[]} predicate The function called per iteration or
-     *  property names to pick.
-     * @returns {Object} Returns the new object.
-     */
-    function basePick(object, predicate) {
-      var result = {};
-
-      if (typeof predicate == 'function') {
-        baseForIn(object, function(value, key, object) {
-          if (predicate(value, key, object)) {
-            result[key] = value;
-          }
-        });
-        return result;
-      }
-      var index = -1,
-          props = predicate,
-          length = props.length;
-
-      while (++index < length) {
-        var key = props[index];
-        if (key in object) {
-          result[key] = object[key];
-        }
-      }
-      return result;
+      return (bitmask & PARTIAL_FLAG)
+        ? createWrapper(func, bitmask, arity, thisArg, args, holders)
+        : createWrapper(func, bitmask, arity, thisArg, null, null, args, holders);
     }
 
     /**
@@ -2180,22 +2045,44 @@
      *
      * @private
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {*} accumulator The initial value.
      * @param {boolean} initFromCollection Specify using the first or last element
      *  of `collection` as the initial value.
      * @param {Function} eachFunc The function to iterate over `collection`.
      * @returns {*} Returns the accumulated value.
      */
-    function baseReduce(collection, iterator, accumulator, initFromCollection, eachFunc) {
+    function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
       eachFunc(collection, function(value, index, collection) {
         accumulator = initFromCollection
           ? (initFromCollection = false, value)
-          : iterator(accumulator, value, index, collection)
+          : iteratee(accumulator, value, index, collection)
       });
       return accumulator;
     }
 
+    /**
+     * The base implementation of `setData` without support for hot loop detection.
+     *
+     * @private
+     * @param {Function} func The function to associate metadata with.
+     * @param {*} data The metadata.
+     * @returns {Function} Returns `func`.
+     */
+    function baseSetData(func, data) {
+      metaMap.set(func, data);
+      return func;
+    }
+    // fallback for environments without `WeakMap`
+    if (!WeakMap) {
+      baseSetData = !defineProperty ? identity : function(func, value) {
+        descriptor.value = value;
+        defineProperty(func, EXPANDO, descriptor);
+        descriptor.value = null;
+        return func;
+      };
+    }
+
     /**
      * The base implementation of `_.some` without support for callback shorthands
      * or `this` binding.
@@ -2223,24 +2110,24 @@
      * @private
      * @param {Array} array The array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {Function} iterator The function called per iteration.
+     * @param {Function} iteratee The function called per iteration.
      * @param {boolean} [retHighest=false] Specify returning the highest, instead
      *  of the lowest, index at which a value should be inserted into `array`.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      */
-    function baseSortedIndex(array, value, iterator, retHighest) {
+    function baseSortedIndex(array, value, iteratee, retHighest) {
       var low = 0,
           high = array ? array.length : low;
 
-      value = iterator(value);
+      value = iteratee(value);
       var hintNum = typeof value == 'number' ||
         (value != null && isFunction(value.valueOf) && typeof value.valueOf() == 'number');
 
       while (low < high) {
         var mid = (low + high) >>> 1,
-            computed = iterator(array[mid]),
-            setLow = retHighest ? computed <= value : computed < value;
+            computed = iteratee(array[mid]),
+            setLow = retHighest ? (computed <= value) : (computed < value);
 
         if (hintNum && typeof computed != 'undefined') {
           computed = +computed;
@@ -2261,10 +2148,10 @@
      *
      * @private
      * @param {Array} array The array to inspect.
-     * @param {Function} [iterator] The function called per iteration.
+     * @param {Function} [iteratee] The function called per iteration.
      * @returns {Array} Returns the new duplicate-value-free array.
      */
-    function baseUniq(array, iterator) {
+    function baseUniq(array, iteratee) {
       var index = -1,
           indexOf = getIndexOf(),
           length = array.length,
@@ -2277,27 +2164,27 @@
         var seen = createCache();
         indexOf = cacheIndexOf;
       } else {
-        seen = iterator ? [] : result;
+        seen = iteratee ? [] : result;
       }
       outer:
       while (++index < length) {
         var value = array[index],
-            computed = iterator ? iterator(value, index, array) : value;
+            computed = iteratee ? iteratee(value, index, array) : value;
 
-        if (isCommon) {
+        if (isCommon && value === value) {
           var seenIndex = seen.length;
           while (seenIndex--) {
             if (seen[seenIndex] === computed) {
               continue outer;
             }
           }
-          if (iterator) {
+          if (iteratee) {
             seen.push(computed);
           }
           result.push(value);
         }
         else if (indexOf(seen, computed) < 0) {
-          if (iterator || isLarge) {
+          if (iteratee || isLarge) {
             seen.push(computed);
           }
           result.push(value);
@@ -2328,6 +2215,36 @@
       return result;
     }
 
+    /**
+     * Creates a clone of the given array buffer.
+     *
+     * @private
+     * @param {ArrayBuffer} buffer The array buffer to clone.
+     * @returns {ArrayBuffer} Returns the cloned array buffer.
+     */
+    function bufferClone(buffer) {
+      return bufferSlice.call(buffer, 0);
+    }
+    if (!bufferSlice) {
+      // PhantomJS has `ArrayBuffer` and `Uint8Array` but not `Float64Array`
+      bufferClone = !(ArrayBuffer && Uint8Array) ? identity : function(buffer) {
+        var byteLength = buffer.byteLength,
+            floatLength = Float64Array ? floor(byteLength / FLOAT64_BYTES_PER_ELEMENT) : 0,
+            offset = floatLength * FLOAT64_BYTES_PER_ELEMENT,
+            result = new ArrayBuffer(byteLength);
+
+        if (floatLength) {
+          var view = new Float64Array(result, 0, floatLength);
+          view.set(new Float64Array(buffer, 0, floatLength));
+        }
+        if (byteLength != offset) {
+          view = new Uint8Array(result, offset);
+          view.set(new Uint8Array(buffer, offset));
+        }
+        return result;
+      };
+    }
+
     /**
      * Creates an array that is the composition of partially applied arguments,
      * placeholders, and provided arguments into a single array of arguments.
@@ -2393,7 +2310,7 @@
     /**
      * Creates a function that aggregates a collection, creating an accumulator
      * object composed from the results of running each element in the collection
-     * through `iterator`. The given setter function sets the keys and values of
+     * through `iteratee`. The given setter function sets the keys and values of
      * the accumulator object. If `initializer` is provided it is used to initialize
      * the accumulator object.
      *
@@ -2403,9 +2320,9 @@
      * @returns {Function} Returns the new aggregator function.
      */
     function createAggregator(setter, initializer) {
-      return function(collection, iterator, thisArg) {
+      return function(collection, iteratee, thisArg) {
         var result = initializer ? initializer() : {};
-        iterator = getCallback(iterator, thisArg, 3);
+        iteratee = getCallback(iteratee, thisArg, 3);
 
         if (isArray(collection)) {
           var index = -1,
@@ -2413,11 +2330,11 @@
 
           while (++index < length) {
             var value = collection[index];
-            setter(result, value, iterator(value, index, collection), collection);
+            setter(result, value, iteratee(value, index, collection), collection);
           }
         } else {
           baseEach(collection, function(value, key, collection) {
-            setter(result, value, iterator(value, key, collection), collection);
+            setter(result, value, iteratee(value, key, collection), collection);
           });
         }
         return result;
@@ -2433,44 +2350,43 @@
      * @returns {Function} Returns the new assigner function.
      */
     function createAssigner(assigner) {
-      return function(object) {
-        var args = arguments,
-            length = args.length;
+      return function() {
+        var length = arguments.length,
+            object = arguments[0];
 
         if (object == null || length < 2) {
           return object;
         }
         // enables use as a callback for functions like `_.reduce`
-        var type = typeof args[2];
-        if ((type == 'number' || type == 'string') && args[3] && args[3][args[2]] === args[1]) {
+        var type = typeof arguments[2];
+        if ((type == 'number' || type == 'string') && arguments[3] && arguments[3][arguments[2]] === arguments[1]) {
           length = 2;
         }
         // juggle arguments
-        if (length > 3 && typeof args[length - 2] == 'function') {
-          var customizer = baseCallback(args[--length - 1], args[length--], 5);
-        } else if (length > 2 && typeof args[length - 1] == 'function') {
-          customizer = args[--length];
+        if (length > 3 && typeof arguments[length - 2] == 'function') {
+          var customizer = baseCallback(arguments[--length - 1], arguments[length--], 5);
+        } else if (length > 2 && typeof arguments[length - 1] == 'function') {
+          customizer = arguments[--length];
         }
         var index = 0;
         while (++index < length) {
-          assigner(object, args[index], customizer);
+          assigner(object, arguments[index], customizer);
         }
         return object;
       };
     }
 
     /**
-     * Creates a function that invokes the function specified in the metadata
-     * with its associated `this` binding.
+     * Creates a function that wraps `func` and invokes it with the `this`
+     * binding of `thisArg`.
      *
      * @private
-     * @param {Array} data The metadata array. See `createWrapper` for more details.
-     * @returns {Function} Returns the new bound function.
+     * @param {Function} func The function to bind.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @returns {Function} Returns the new wrapped function.
      */
-    function createBindWrapper(data) {
-      var func = data[0],
-          thisArg = data[3],
-          Ctor = createCtorWrapper(func);
+    function createBindWrapper(func, thisArg) {
+      var Ctor = createCtorWrapper(func);
 
       function wrapper() {
         return (this instanceof wrapper ? Ctor : func).apply(thisArg, arguments);
@@ -2515,6 +2431,77 @@
       };
     }
 
+    /**
+     * Creates a function that wraps `func` and invokes it with optional `this`
+     * binding of, partial application, and currying.
+     *
+     * @private
+     * @param {Function|string} func The function or method name to reference.
+     * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+     * @param {number} arity The arity of `func`.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partialArgs] An array of arguments to prepend to those provided to the new function.
+     * @param {Array} [partialHolders] An array of `partialArgs` placeholder indexes.
+     * @param {Array} [partialRightArgs] An array of arguments to append to those provided to the new function.
+     * @param {Array} [partialRightHolders] An array of `partialRightArgs` placeholder indexes.
+     * @returns {Function} Returns the new function.
+     */
+    function createHybridWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders) {
+      var isBind = bitmask & BIND_FLAG,
+          isBindKey = bitmask & BIND_KEY_FLAG,
+          isCurry = bitmask & CURRY_FLAG,
+          isCurryRight = bitmask & CURRY_RIGHT_FLAG,
+          isCurryBound = bitmask & CURRY_BOUND_FLAG;
+
+      var Ctor = !isBindKey && createCtorWrapper(func),
+          key = func;
+
+      function wrapper() {
+        var length = arguments.length,
+            index = length,
+            args = Array(length);
+
+        while (index--) {
+          args[index] = arguments[index];
+        }
+        if (partialArgs) {
+          args = composeArgs(partialArgs, partialHolders, args);
+        }
+        if (partialRightArgs) {
+          args = composeArgsRight(partialRightArgs, partialRightHolders, args);
+        }
+        if (isCurry || isCurryRight) {
+          var placeholder = wrapper.placeholder,
+              holders = replaceHolders(args, placeholder);
+
+          length -= holders.length;
+          if (length < arity) {
+            var newArity = nativeMax(arity - length, 0),
+                newPartialArgs = isCurry ? args : null,
+                newPartialHolders = isCurry ? holders : null,
+                newPartialRightArgs = isCurry ? null : args,
+                newPartialRightHolders = isCurry ? null : holders;
+
+            bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG);
+            bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG);
+
+            if (!isCurryBound) {
+              bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
+            }
+            var result = createHybridWrapper(func, bitmask, newArity, thisArg, newPartialArgs, newPartialHolders, newPartialRightArgs, newPartialRightHolders);
+            result.placeholder = placeholder;
+            return setData(result, [func, bitmask, newArity, thisArg, newPartialArgs, newPartialHolders, newPartialRightArgs, newPartialRightHolders]);
+          }
+        }
+        var thisBinding = isBind ? thisArg : this;
+        if (isBindKey) {
+          func = thisBinding[key];
+        }
+        return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
+      }
+      return wrapper;
+    }
+
     /**
      * Creates the pad required for `string` based on the given padding length.
      * The `chars` string may be truncated if the number of padding characters
@@ -2539,25 +2526,25 @@
     }
 
     /**
-     * Creates a function that invokes the function specified in the metadata
-     * with its associated partially applied arguments and optional `this` binding.
+     * Creates a function that wraps `func` and invokes it with the optional `this`
+     * binding of `thisArg` and the `partialArgs` prepended to those provided to
+     * the wrapper.
      *
      * @private
-     * @param {Array} data The metadata array. See `createWrapper` for more details.
+     * @param {Function} func The function to partially apply arguments to.
+     * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+     * @param {Array} partialArgs An array of arguments to prepend to those provided to the new function.
+     * @param {*} [thisArg] The `this` binding of `func`.
      * @returns {Function} Returns the new bound function.
      */
-    function createPartialWrapper(data) {
-      var func = data[0],
-          thisArg = data[3],
-          partialArgs = data[4];
-
-      var isBind = data[1] & BIND_FLAG,
+    function createPartialWrapper(func, bitmask, partialArgs, thisArg) {
+      var isBind = bitmask & BIND_FLAG,
           Ctor = createCtorWrapper(func);
 
       function wrapper() {
         // avoid `arguments` object use disqualifying optimizations by
         // converting it to an array before passing it to `composeArgs`
-        var argsIndex = 0,
+        var argsIndex = -1,
             argsLength = arguments.length,
             leftIndex = -1,
             leftLength = partialArgs.length,
@@ -2567,7 +2554,7 @@
           args[leftIndex] = partialArgs[leftIndex];
         }
         while (argsLength--) {
-          args[leftIndex++] = arguments[argsIndex++];
+          args[leftIndex++] = arguments[++argsIndex];
         }
         return (this instanceof wrapper ? Ctor : func).apply(isBind ? thisArg : this, args);
       }
@@ -2579,9 +2566,8 @@
      * `this` binding and partially applied arguments.
      *
      * @private
-     * @param {Array} data The metadata array.
-     * @param {Function|string} data[0] The function or method name to reference.
-     * @param {number} data[1] The bitmask of flags to compose.
+     * @param {Function|string} func The function or method name to reference.
+     * @param {number} bitmask The bitmask of flags.
      *  The bitmask may be composed of the following flags:
      *   1  - `_.bind`
      *   2  - `_.bindKey`
@@ -2590,97 +2576,80 @@
      *   16 - `_.curry` or `_.curryRight` of a bound function
      *   32 - `_.partial`
      *   64 - `_.partialRight`
-     * @param {number} data[2] The arity of `data[0]`.
-     * @param {*} [data[3]] The `this` binding of `data[0]`.
-     * @param {Array} [data[4]] An array of arguments to prepend to those
-     *  provided to the new function.
-     * @param {Array} [data[5]] An array of `data[4]` placeholder indexes.
-     * @param {Array} [data[6]] An array of arguments to append to those
-     *  provided to the new function.
-     * @param {Array} [data[7]] An array of `data[6]` placeholder indexes.
+     * @param {number} arity The arity of `func`.
+     * @param {*} [thisArg] The `this` binding of `func`.
+     * @param {Array} [partialArgs] An array of arguments to prepend to those provided to the new function.
+     * @param {Array} [partialHolders] An array of `partialArgs` placeholder indexes.
+     * @param {Array} [partialRightArgs] An array of arguments to append to those provided to the new function.
+     * @param {Array} [partialRightHolders] An array of `partialRightArgs` placeholder indexes.
      * @returns {Function} Returns the new function.
      */
-    function createWrapper(data) {
-      var func = data[0],
-          bitmask = data[1];
-
-      var isBind = bitmask & BIND_FLAG,
-          isBindKey = bitmask & BIND_KEY_FLAG,
-          isPartial = bitmask & PARTIAL_FLAG,
-          isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
-
+    function createWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders) {
+      var isBindKey = bitmask & BIND_KEY_FLAG;
       if (!isBindKey && !isFunction(func)) {
         throw new TypeError(FUNC_ERROR_TEXT);
       }
-      var arity = data[2],
-          partialArgs = data[4],
-          partialRightArgs = data[6];
-
+      var isPartial = bitmask & PARTIAL_FLAG;
       if (isPartial && !partialArgs.length) {
+        bitmask &= ~PARTIAL_FLAG;
         isPartial = false;
-        data[1] = (bitmask &= ~PARTIAL_FLAG);
-        data[4] = data[5] = partialArgs = null;
+        partialArgs = partialHolders = null;
       }
+      var isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
       if (isPartialRight && !partialRightArgs.length) {
+        bitmask &= ~PARTIAL_RIGHT_FLAG;
         isPartialRight = false;
-        data[1] = (bitmask &= ~PARTIAL_RIGHT_FLAG);
-        data[6] = data[7] = partialRightArgs = null;
+        partialRightArgs = partialRightHolders = null;
       }
-      var funcData = !isBindKey && func[EXPANDO];
-      if (funcData && funcData !== true) {
-        // shallow clone `funcData`
-        funcData = slice(funcData);
+      var data = (data = !isBindKey && getData(func)) && data !== true && data;
+      if (data) {
+        var funcBitmask = data[1],
+            funcIsBind = funcBitmask & BIND_FLAG,
+            isBind = bitmask & BIND_FLAG;
 
-        // clone partial left arguments
-        if (funcData[4]) {
-          funcData[4] = slice(funcData[4]);
-          funcData[5] = slice(funcData[5]);
+        // use metadata `func` and merge bitmasks
+        func = data[0];
+        bitmask |= funcBitmask;
+
+        // use metadata `arity` if not provided
+        if (arity == null) {
+          arity = data[2];
         }
-        // clone partial right arguments
-        if (funcData[6]) {
-          funcData[6] = slice(funcData[6]);
-          funcData[7] = slice(funcData[7]);
-        }
-        // set arity if provided
-        if (typeof arity == 'number') {
-          funcData[2] = arity;
-        }
-        // set `thisArg` if not previously bound
-        var bound = funcData[1] & BIND_FLAG;
-        if (isBind && !bound) {
-          funcData[3] = data[3];
+        // use metadata `thisArg` if available
+        if (funcIsBind) {
+          thisArg = data[3];
         }
         // set if currying a bound function
-        if (!isBind && bound) {
+        if (!isBind && funcIsBind) {
           bitmask |= CURRY_BOUND_FLAG;
         }
         // append partial left arguments
-        if (isPartial) {
-          var funcPartialArgs = funcData[4];
-          if (funcPartialArgs) {
-            funcPartialArgs = composeArgs(funcPartialArgs, funcData[5], partialArgs);
-          }
-          funcData[4] = funcPartialArgs || partialArgs;
-          funcData[5] = funcPartialArgs ? replaceHolders(funcPartialArgs, PLACEHOLDER) : data[5];
+        var funcArgs = data[4];
+        if (funcArgs) {
+          var funcHolders = data[5];
+          partialArgs = isPartial ? composeArgs(funcArgs, funcHolders, partialArgs) : baseSlice(funcArgs);
+          partialHolders = isPartial ? replaceHolders(partialArgs, PLACEHOLDER) : baseSlice(funcHolders);
         }
         // prepend partial right arguments
-        if (isPartialRight) {
-          var funcPartialRightArgs = funcData[6];
-          if (funcPartialRightArgs) {
-            funcPartialRightArgs = composeArgsRight(funcPartialRightArgs, funcData[7], partialRightArgs);
-          }
-          funcData[6] = funcPartialRightArgs || partialRightArgs;
-          funcData[7] = funcPartialRightArgs ? replaceHolders(funcPartialRightArgs, PLACEHOLDER) : data[7];
+        funcArgs = data[6];
+        if (funcArgs) {
+          funcHolders = data[7];
+          partialRightArgs = isPartialRight ? composeArgsRight(funcArgs, funcHolders, partialRightArgs) : baseSlice(funcArgs);
+          partialRightHolders = isPartialRight ? replaceHolders(partialRightArgs, PLACEHOLDER) : baseSlice(funcHolders);
         }
-        // merge flags
-        funcData[1] |= bitmask;
-        return createWrapper(funcData);
       }
       if (arity == null) {
         arity = isBindKey ? 0 : func.length;
       }
-      data[2] = nativeMax(arity, 0);
-      return baseCreateWrapper(data);
+      if (bitmask == BIND_FLAG) {
+        var result = createBindWrapper(func, thisArg);
+      } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !partialHolders.length) {
+        result = createPartialWrapper(func, bitmask, partialArgs, thisArg);
+      } else {
+        result = createHybridWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders);
+      }
+      var setter = data ? baseSetData : setData;
+      return setter(result, [func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders]);
     }
 
     /**
@@ -2695,7 +2664,24 @@
     function getCallback(func, thisArg, argCount) {
       var result = lodash.callback || callback;
       result = result === callback ? baseCallback : result;
-      return arguments.length ? result(func, thisArg, argCount) : result;
+      return argCount ? result(func, thisArg, argCount) : result;
+    }
+
+    /**
+     * Gets metadata for `func`.
+     *
+     * @private
+     * @param {Function} func The function to query.
+     * @returns {*} Returns the metadata for `func`.
+     */
+    function getData(func) {
+      return metaMap.get(func);
+    }
+    // fallback for environments without `WeakMap`
+    if (!WeakMap) {
+      getData = !defineProperty ? noop : function(func) {
+        return func[EXPANDO];
+      };
     }
 
     /**
@@ -2713,6 +2699,84 @@
       return collection ? result(collection, target, fromIndex) : result;
     }
 
+    /**
+     * Initializes an array clone.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep=false] Specify a deep clone.
+     * @returns {*} Returns the initialized clone value.
+     */
+    function initArrayClone(array, isDeep) {
+      var index = -1,
+          length = array.length,
+          result = array.constructor(length);
+
+      if (!isDeep) {
+        while (++index < length) {
+          result[index] = array[index];
+        }
+      }
+      // add array properties assigned by `RegExp#exec`
+      if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+        result.index = array.index;
+        result.input = array.input;
+      }
+      return result;
+    }
+
+    /**
+     * Initializes an object clone.
+     *
+     * @private
+     * @param {*} value The value to clone.
+     * @param {boolean} [isDeep=false] Specify a deep clone.
+     * @returns {*} Returns the initialized clone value.
+     */
+    function initObjectClone(object, isDeep) {
+      var className = toString.call(object);
+      if (!cloneableClasses[className]) {
+        return object;
+      }
+      var Ctor = object.constructor,
+          isArgs = className == argsClass,
+          isObj = className == objectClass;
+
+      if (isObj && !(isFunction(Ctor) && (Ctor instanceof Ctor))) {
+        Ctor = Object;
+      }
+      if (isArgs || isObj) {
+        var result = isDeep ? new Ctor : baseAssign(new Ctor, object);
+        if (isArgs) {
+          result.length = object.length;
+        }
+        return result;
+      }
+      switch (className) {
+        case arrayBufferClass:
+          return bufferClone(object);
+
+        case boolClass:
+        case dateClass:
+          return new Ctor(+object);
+
+        case float32Class: case float64Class:
+        case int8Class: case int16Class: case int32Class:
+        case uint8Class: case uint8ClampedClass: case uint16Class: case uint32Class:
+          var buffer = object.buffer;
+          return new Ctor(isDeep ? bufferClone(buffer) : buffer, object.byteOffset, object.length);
+
+        case numberClass:
+        case stringClass:
+          return new Ctor(object);
+
+        case regexpClass:
+          result = Ctor(object.source, reFlags.exec(object));
+          result.lastIndex = object.lastIndex;
+      }
+      return result;
+    }
+
     /**
      * Checks if `value` is an array-like object.
      *
@@ -2725,20 +2789,6 @@
         arrayLikeClasses[toString.call(value)]) || false;
     }
 
-    /**
-     * Checks if `value` is a native function.
-     *
-     * @private
-     * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
-     */
-    function isNative(value) {
-      var type = typeof value;
-      return type == 'function'
-        ? reNative.test(fnToString.call(value))
-        : (value && type == 'object' && reHostCtor.test(toString.call(value))) || false;
-    }
-
     /**
      * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
      *
@@ -2748,37 +2798,50 @@
      *  equality comparisons, else `false`.
      */
     function isStrictComparable(value) {
-      return value === value && (value === 0 ? (1 / value > 0) : !isObject(value));
+      return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
     }
 
     /**
-     * Creates a clone of the given array buffer.
+     * A specialized version of `_.pick` that picks `object` properties
+     * specified by the `props` array.
      *
      * @private
-     * @param {ArrayBuffer} buffer The array buffer to clone.
-     * @returns {ArrayBuffer} Returns the cloned array buffer.
+     * @param {Object} object The source object.
+     * @param {string[]} props The property names to pick.
+     * @returns {Object} Returns the new object.
      */
-    function cloneBuffer(buffer) {
-      return bufferSlice.call(buffer, 0);
-    }
-    if (!bufferSlice) {
-      // PhantomJS has `ArrayBuffer` and `Uint8Array` but not `Float64Array`
-      cloneBuffer = !(ArrayBuffer && Uint8Array) ? identity : function(buffer) {
-        var byteLength = buffer.byteLength,
-            floatLength = Float64Array ? floor(byteLength / FLOAT64_BYTES_PER_ELEMENT) : 0,
-            offset = floatLength * FLOAT64_BYTES_PER_ELEMENT,
-            result = new ArrayBuffer(byteLength);
+    function pickByArray(object, props) {
+      var index = -1,
+          length = props.length,
+          result = {};
 
-        if (floatLength) {
-          var view = new Float64Array(result, 0, floatLength);
-          view.set(new Float64Array(buffer, 0, floatLength));
+      while (++index < length) {
+        var key = props[index];
+        if (key in object) {
+          result[key] = object[key];
         }
-        if (byteLength != offset) {
-          view = new Uint8Array(result, offset);
-          view.set(new Uint8Array(buffer, offset));
+      }
+      return result;
+    }
+
+    /**
+     * A specialized version of `_.pick` that picks `object` properties
+     * the predicate returns truthy for.
+     *
+     * @private
+     * @param {Object} object The source object.
+     * @param {Function} predicate The function called per iteration.
+     * @returns {Object} Returns the new object.
+     */
+    function pickByCallback(object, predicate) {
+      var result = {};
+
+      baseForIn(object, function(value, key, object) {
+        if (predicate(value, key, object)) {
+          result[key] = value;
         }
-        return result;
-      };
+      });
+      return result;
     }
 
     /**
@@ -2793,31 +2856,49 @@
     function replaceHolders(array, placeholder) {
       var index = -1,
           length = array.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         if (array[index] === placeholder) {
           array[index] = PLACEHOLDER;
-          result.push(index);
+          result[++resIndex] = index;
         }
       }
       return result;
     }
 
     /**
-     * Sets wrapper metadata on a given function.
+     * Sets metadata for `func`.
+     *
+     * **Note**: If this function becomes hot, i.e. is called a lot in a short
+     * period of time, it will trip its breaker and transition to an identity
+     * function to avoid garbage collection pauses.
      *
      * @private
-     * @param {Function} func The function to set data on.
-     * @param {Array} value The data array to set.
+     * @param {Function} func The function to associate metadata with.
+     * @param {*} data The metadata.
      * @returns {Function} Returns `func`.
      */
-    var setData = !defineProperty ? identity : function(func, value) {
-      descriptor.value = value;
-      defineProperty(func, EXPANDO, descriptor);
-      descriptor.value = null;
-      return func;
-    };
+    var setData = (function() {
+      var count = 0,
+          lastCalled = 0;
+
+      return function(key, value) {
+        var stamp = now ? now() : 0,
+            remaining = HOT_SPAN - (stamp - lastCalled);
+
+        lastCalled = stamp;
+        if (remaining > 0) {
+          if (++count > HOT_COUNT) {
+            return key;
+          }
+        } else {
+          count = 0;
+        }
+        return baseSetData(key, value);
+      };
+    }());
 
     /**
      * A fallback implementation of `_.isPlainObject` which checks if `value`
@@ -2883,22 +2964,23 @@
      *
      * @private
      * @param {Array} array The array to inspect.
-     * @param {Function} [iterator] The function called per iteration.
+     * @param {Function} [iteratee] The function called per iteration.
      * @returns {Array} Returns the new duplicate-value-free array.
      */
-    function sortedUniq(array, iterator) {
+    function sortedUniq(array, iteratee) {
       var seen,
           index = -1,
           length = array.length,
+          resIndex = -1,
           result = [];
 
       while (++index < length) {
         var value = array[index],
-            computed = iterator ? iterator(value, index, array) : value;
+            computed = iteratee ? iteratee(value, index, array) : value;
 
         if (!index || seen !== computed) {
           seen = computed;
-          result.push(value);
+          result[++resIndex] = value;
         }
       }
       return result;
@@ -2937,7 +3019,7 @@
     /*--------------------------------------------------------------------------*/
 
     /**
-     * Creates an array of elements split into groups the length of `chunkSize`.
+     * Creates an array of elements split into groups the length of `size`.
      * If `collection` can't be split evenly, the final chunk will be the remaining
      * elements.
      *
@@ -2945,7 +3027,7 @@
      * @memberOf _
      * @category Array
      * @param {Array} array The array to process.
-     * @param {numer} [chunkSize=1] The size of each chunk.
+     * @param {numer} [size=1] The length of each chunk.
      * @returns {Array} Returns the new array containing chunks.
      * @example
      *
@@ -2955,14 +3037,15 @@
      * _.chunk(['a', 'b', 'c', 'd'], 3);
      * // => [['a', 'b', 'c'], ['d']]
      */
-    function chunk(array, chunkSize) {
+    function chunk(array, size) {
       var index = 0,
           length = array ? array.length : 0,
+          resIndex = -1,
           result = [];
 
-      chunkSize = nativeMax(+chunkSize || 1, 1);
+      size = typeof size == 'undefined' ? 1 : nativeMax(+size || 1, 1);
       while (index < length) {
-        result.push(slice(array, index, (index += chunkSize)));
+        result[++resIndex] = slice(array, index, (index += size));
       }
       return result;
     }
@@ -2997,8 +3080,12 @@
     }
 
     /**
-     * Creates an array excluding all values of the provided arrays using strict
-     * equality for comparisons, i.e. `===`.
+     * Creates an array excluding all values of the provided arrays using
+     * `SameValueZero` for equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3131,7 +3218,7 @@
           index = length;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (index-- && predicate(array[index], index, array)) { }
+      while (index-- && predicate(array[index], index, array)) {}
       return slice(array, 0, index + 1);
     }
 
@@ -3180,7 +3267,7 @@
           length = array ? array.length : 0;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (++index < length && predicate(array[index], index, array)) { }
+      while (++index < length && predicate(array[index], index, array)) {}
       return slice(array, index);
     }
 
@@ -3365,10 +3452,14 @@
 
     /**
      * Gets the index at which the first occurrence of `value` is found in `array`
-     * using strict equality for comparisons, i.e. `===`. If `fromIndex` is negative,
+     * using `SameValueZero` for equality comparisons. If `fromIndex` is negative,
      * it is used as the offset from the end of the collection. If `array` is
      * sorted providing `true` for `fromIndex` performs a faster binary search.
      *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
+     *
      * @static
      * @memberOf _
      * @category Array
@@ -3422,7 +3513,11 @@
 
     /**
      * Creates an array of unique values present in all provided arrays using
-     * strict equality for comparisons, i.e. `===`.
+     * `SameValueZero` for equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3530,8 +3625,10 @@
         index = sortedLastIndex(array, value) - 1;
         return (length && array[index] === value) ? index : -1;
       }
+      var isReflexive = value === value;
       while (index--) {
-        if (array[index] === value) {
+        var other = array[index];
+        if ((isReflexive ? other === value : other !== other)) {
           return index;
         }
       }
@@ -3539,10 +3636,14 @@
     }
 
     /**
-     * Removes all provided values from `array` using strict equality for
-     * comparisons, i.e. `===`.
+     * Removes all provided values from `array` using `SameValueZero` for equality
+     * comparisons.
      *
-     * Note: Unlike `_.without`, this method mutates `array`.
+     * **Note:** Unlike `_.without`, this method mutates `array`.
+     *
+     * `SameValueZero` is like strict equality, e.g. `===`, except that `NaN` matches
+     * `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3557,20 +3658,18 @@
      * console.log(array);
      * // => [1, 1]
      */
-    function pull(array) {
-      var argsIndex = 0,
-          argsLength = arguments.length,
-          length = array ? array.length : 0;
+    function pull() {
+      var array = arguments[0],
+          index = 0,
+          indexOf = getIndexOf(),
+          length = arguments.length;
 
-      while (++argsIndex < argsLength) {
-        var index = -1,
-            value = arguments[argsIndex];
+      while (++index < length) {
+        var fromIndex = 0,
+            value = arguments[index];
 
-        while (++index < length) {
-          if (array[index] === value) {
-            splice.call(array, index--, 1);
-            length--;
-          }
+        while ((fromIndex = indexOf(array, value, fromIndex)) > -1) {
+          splice.call(array, fromIndex, 1);
         }
       }
       return array;
@@ -3581,7 +3680,7 @@
      * returns an array of the removed elements. Indexes may be specified as an
      * array of indexes or as individual arguments.
      *
-     * Note: Unlike `_.at`, this method mutates `array`.
+     * **Note:** Unlike `_.at`, this method mutates `array`.
      *
      * @static
      * @memberOf _
@@ -3617,7 +3716,7 @@
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
-     * Note: Unlike `_.filter`, this method mutates `array`.
+     * **Note:** Unlike `_.filter`, this method mutates `array`.
      *
      * @static
      * @memberOf _
@@ -3677,7 +3776,7 @@
     /**
      * Slices `array` from the `start` index up to, but not including, the `end` index.
      *
-     * Note: This function is used instead of `Array#slice` to support node lists
+     * **Note:** This function is used instead of `Array#slice` to support node lists
      * in IE < 9 and to ensure dense arrays are returned.
      *
      * @static
@@ -3700,6 +3799,9 @@
       if (end < 0) {
         end += length;
       }
+      if (end && end == length && !start) {
+        return baseSlice(array);
+      }
       length = start > end ? 0 : (end - start);
 
       var result = Array(length);
@@ -3712,14 +3814,14 @@
     /**
      * Uses a binary search to determine the lowest index at which a value should
      * be inserted into a given sorted array in order to maintain the sort order
-     * of the array. If an iterator function is provided it is executed for `value`
-     * and each element of `array` to compute their sort ranking. The iterator
+     * of the array. If an iteratee function is provided it is executed for `value`
+     * and each element of `array` to compute their sort ranking. The iteratee
      * function is bound to `thisArg` and invoked with one argument; (value).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -3728,10 +3830,10 @@
      * @category Array
      * @param {Array} array The array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      * @example
@@ -3744,7 +3846,7 @@
      *
      * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };
      *
-     * // using an iterator function
+     * // using an iteratee function
      * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) {
      *   return this.data[word];
      * }, dict);
@@ -3754,9 +3856,9 @@
      * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
      * // => 1
      */
-    function sortedIndex(array, value, iterator, thisArg) {
-      iterator = iterator == null ? identity : getCallback(iterator, thisArg, 1);
-      return baseSortedIndex(array, value, iterator);
+    function sortedIndex(array, value, iteratee, thisArg) {
+      iteratee = iteratee == null ? identity : getCallback(iteratee, thisArg, 1);
+      return baseSortedIndex(array, value, iteratee);
     }
 
     /**
@@ -3769,10 +3871,10 @@
      * @category Array
      * @param {Array} array The array to inspect.
      * @param {*} value The value to evaluate.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {number} Returns the index at which `value` should be inserted
      *  into `array`.
      * @example
@@ -3780,9 +3882,9 @@
      * _.sortedLastIndex([4, 4, 5, 5, 6, 6], 5);
      * // => 4
      */
-    function sortedLastIndex(array, value, iterator, thisArg) {
-      iterator = iterator == null ? identity : getCallback(iterator, thisArg, 1);
-      return baseSortedIndex(array, value, iterator, true);
+    function sortedLastIndex(array, value, iteratee, thisArg) {
+      iteratee = iteratee == null ? identity : getCallback(iteratee, thisArg, 1);
+      return baseSortedIndex(array, value, iteratee, true);
     }
 
     /**
@@ -3892,7 +3994,7 @@
           index = length;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (index-- && predicate(array[index], index, array)) { }
+      while (index-- && predicate(array[index], index, array)) {}
       return slice(array, index + 1);
     }
 
@@ -3941,13 +4043,17 @@
           length = array ? array.length : 0;
 
       predicate = getCallback(predicate, thisArg, 3);
-      while (++index < length && predicate(array[index], index, array)) { }
+      while (++index < length && predicate(array[index], index, array)) {}
       return slice(array, 0, index);
     }
 
     /**
      * Creates an array of unique values, in order, of the provided arrays using
-     * strict equality for comparisons, i.e. `===`.
+     * `SameValueZero` for equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -3964,30 +4070,34 @@
     }
 
     /**
-     * Creates a duplicate-value-free version of an array using strict equality
-     * for comparisons, i.e. `===`. Providing `true` for `isSorted` performs a
-     * faster search algorithm for sorted arrays. If an iterator function is
-     * provided it is executed for each value in the array to generate the criterion
-     * by which uniqueness is computed. The `iterator` is bound to `thisArg` and
-     * invoked with three arguments; (value, index, array).
+     * Creates a duplicate-value-free version of an array using `SameValueZero`
+     * for equality comparisons. Providing `true` for `isSorted` performs a faster
+     * search algorithm for sorted arrays. If an iteratee function is provided it
+     * is executed for each value in the array to generate the criterion by which
+     * uniqueness is computed. The `iteratee` is bound to `thisArg` and invoked
+     * with three arguments; (value, index, array).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
+     *
      * @static
      * @memberOf _
      * @alias unique
      * @category Array
      * @param {Array} array The array to inspect.
      * @param {boolean} [isSorted=false] Specify the array is sorted.
-     * @param {Function|Object|string} [iterator] The function called per iteration.
+     * @param {Function|Object|string} [iteratee] The function called per iteration.
      *  If a property name or object is provided it is used to create a "_.pluck"
      *  or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the new duplicate-value-free array.
      * @example
      *
@@ -3998,7 +4108,7 @@
      * _.uniq([1, 1, 2], true);
      * // => [1, 2]
      *
-     * // using an iterator function
+     * // using an iteratee function
      * _.uniq([1, 2.5, 1.5, 2], function(n) { return this.floor(n); }, Math);
      * // => [1, 2.5]
      *
@@ -4006,7 +4116,7 @@
      * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
-    function uniq(array, isSorted, iterator, thisArg) {
+    function uniq(array, isSorted, iteratee, thisArg) {
       var length = array ? array.length : 0;
       if (!length) {
         return [];
@@ -4014,21 +4124,21 @@
       // juggle arguments
       var type = typeof isSorted;
       if (type != 'boolean' && isSorted != null) {
-        thisArg = iterator;
-        iterator = isSorted;
+        thisArg = iteratee;
+        iteratee = isSorted;
         isSorted = false;
 
         // enables use as a callback for functions like `_.map`
-        if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === array) {
-          iterator = null;
+        if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === array) {
+          iteratee = null;
         }
       }
-      if (iterator != null) {
-        iterator = getCallback(iterator, thisArg, 3);
+      if (iteratee != null) {
+        iteratee = getCallback(iteratee, thisArg, 3);
       }
       return (isSorted && getIndexOf() == baseIndexOf)
-        ? sortedUniq(array, iterator)
-        : baseUniq(array, iterator);
+        ? sortedUniq(array, iteratee)
+        : baseUniq(array, iteratee);
     }
 
     /**
@@ -4061,8 +4171,12 @@
     }
 
     /**
-     * Creates an array excluding all provided values using strict equality for
-     * comparisons, i.e. `===`.
+     * Creates an array excluding all provided values using `SameValueZero` for
+     * equality comparisons.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -4075,8 +4189,8 @@
      * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
      * // => [2, 3, 4]
      */
-    function without() {
-      return baseDifference(arguments[0], slice(arguments, 1));
+    function without(array) {
+      return baseDifference(array, slice(arguments, 1));
     }
 
     /**
@@ -4128,7 +4242,13 @@
      * // => [['fred', 30, true], ['barney', 40, false]]
      */
     function zip() {
-      return unzip(arguments);
+      var length = arguments.length,
+          array = Array(length);
+
+      while (length--) {
+        array[length] = arguments[length];
+      }
+      return unzip(array);
     }
 
     /**
@@ -4320,9 +4440,13 @@
     }
 
     /**
-     * Checks if `value` is present in `collection` using strict equality for
-     * comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the
-     * offset from the end of the collection.
+     * Checks if `value` is present in `collection` using  `SameValueZero` for
+     * equality comparisons. If `fromIndex` is negative, it is used as the offset
+     * from the end of the collection.
+     *
+     * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+     * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+     * for more details.
      *
      * @static
      * @memberOf _
@@ -4358,28 +4482,22 @@
       } else {
         fromIndex = 0;
       }
-      if (typeof collection == 'string' || !isArray(collection) && isString(collection)) {
-        if (fromIndex >= length) {
-          return false;
-        }
-        return nativeContains
-          ? nativeContains.call(collection, target, fromIndex)
-          : collection.indexOf(target, fromIndex) > -1;
-      }
-      return getIndexOf(collection, target, fromIndex) > -1;
+      return (typeof collection == 'string' || !isArray(collection) && isString(collection))
+        ? (fromIndex < length && collection.indexOf(target, fromIndex) > -1)
+        : (getIndexOf(collection, target, fromIndex) > -1);
     }
 
     /**
      * Creates an object composed of keys generated from the results of running
-     * each element of `collection` through `iterator`. The corresponding value
-     * of each key is the number of times the key was returned by `iterator`.
-     * The `iterator` is bound to `thisArg` and invoked with three arguments;
+     * each element of `collection` through `iteratee`. The corresponding value
+     * of each key is the number of times the key was returned by `iteratee`.
+     * The `iteratee` is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4387,10 +4505,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the composed aggregate object.
      * @example
      *
@@ -4449,10 +4567,10 @@
      * // => false
      */
     function every(collection, predicate, thisArg) {
+      var func = isArray(collection) ? arrayEvery : baseEvery;
       if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
         predicate = getCallback(predicate, thisArg, 3);
       }
-      var func = isArray(collection) ? arrayEvery : baseEvery;
       return func(collection, predicate);
     }
 
@@ -4497,9 +4615,9 @@
      * // => [{ 'name': 'barney', 'age': 36 }]
      */
     function filter(collection, predicate, thisArg) {
-      predicate = getCallback(predicate, thisArg, 3);
-
       var func = isArray(collection) ? arrayFilter : baseFilter;
+
+      predicate = getCallback(predicate, thisArg, 3);
       return func(collection, predicate);
     }
 
@@ -4607,12 +4725,12 @@
     }
 
     /**
-     * Iterates over elements of `collection` executing `iterator` for each
-     * element. The `iterator` is bound to `thisArg` and invoked with three arguments;
+     * Iterates over elements of `collection` executing `iteratee` for each
+     * element. The `iteratee` is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection). Iterator functions may exit iteration early
      * by explicitly returning `false`.
      *
-     * Note: As with other "Collections" methods, objects with a `length` property
+     * **Note:** As with other "Collections" methods, objects with a `length` property
      * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
      * may be used for object iteration.
      *
@@ -4621,8 +4739,8 @@
      * @alias each
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array|Object|string} Returns `collection`.
      * @example
      *
@@ -4630,12 +4748,12 @@
      * // => logs each value and returns the array
      *
      * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); });
-     * // => logs each value-key pair and returns the object (property order is not guaranteed across environments)
+     * // => logs each value-key pair and returns the object (property order is not guaranteed)
      */
-    function forEach(collection, iterator, thisArg) {
-      return (typeof iterator == 'function' && typeof thisArg == 'undefined' && isArray(collection))
-        ? arrayEach(collection, iterator)
-        : baseEach(collection, baseCallback(iterator, thisArg, 3));
+    function forEach(collection, iteratee, thisArg) {
+      return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+        ? arrayEach(collection, iteratee)
+        : baseEach(collection, baseCallback(iteratee, thisArg, 3));
     }
 
     /**
@@ -4647,31 +4765,31 @@
      * @alias eachRight
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array|Object|string} Returns `collection`.
      * @example
      *
      * _([1, 2, 3]).forEachRight(function(n) { console.log(n); }).join(',');
      * // => logs each value from right to left and returns the array
      */
-    function forEachRight(collection, iterator, thisArg) {
-      return (typeof iterator == 'function' && typeof thisArg == 'undefined' && isArray(collection))
-        ? arrayEachRight(collection, iterator)
-        : baseEachRight(collection, baseCallback(iterator, thisArg, 3));
+    function forEachRight(collection, iteratee, thisArg) {
+      return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+        ? arrayEachRight(collection, iteratee)
+        : baseEachRight(collection, baseCallback(iteratee, thisArg, 3));
     }
 
     /**
      * Creates an object composed of keys generated from the results of running
-     * each element of `collection` through `iterator`. The corresponding
+     * each element of `collection` through `iteratee`. The corresponding
      * value of each key is an array of the elements responsible for generating
-     * the key. The `iterator` is bound to `thisArg` and invoked with three
+     * the key. The `iteratee` is bound to `thisArg` and invoked with three
      * arguments; (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4679,10 +4797,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the composed aggregate object.
      * @example
      *
@@ -4706,15 +4824,15 @@
 
     /**
      * Creates an object composed of keys generated from the results of running
-     * each element of the collection through `iterator`. The corresponding value
+     * each element of the collection through `iteratee`. The corresponding value
      * of each key is the last element responsible for generating the key. The
-     * iterator function is bound to `thisArg` and invoked with three arguments;
+     * iteratee function is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4722,10 +4840,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the composed aggregate object.
      * @example
      *
@@ -4775,13 +4893,13 @@
 
     /**
      * Creates an array of values by running each element in the collection through
-     * `iterator`. The `iterator` is bound to `thisArg` and invoked with three
+     * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
      * arguments; (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4790,10 +4908,10 @@
      * @alias collect
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the new mapped array.
      * @example
      *
@@ -4801,7 +4919,7 @@
      * // => [3, 6, 9]
      *
      * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; });
-     * // => [3, 6, 9] (property order is not guaranteed across environments)
+     * // => [3, 6, 9] (property order is not guaranteed)
      *
      * var characters = [
      *   { 'name': 'barney', 'age': 36 },
@@ -4812,24 +4930,24 @@
      * _.map(characters, 'name');
      * // => ['barney', 'fred']
      */
-    function map(collection, iterator, thisArg) {
-      iterator = getCallback(iterator, thisArg, 3);
+    function map(collection, iteratee, thisArg) {
+      iteratee = getCallback(iteratee, thisArg, 3);
 
       var func = isArray(collection) ? arrayMap : baseMap;
-      return func(collection, iterator);
+      return func(collection, iteratee);
     }
 
     /**
      * Retrieves the maximum value of `collection`. If the collection is empty
-     * or falsey `-Infinity` is returned. If an iterator function is provided it
+     * or falsey `-Infinity` is returned. If an iteratee function is provided it
      * is executed for each value in the collection to generate the criterion by
-     * which the value is ranked. The `iterator` is bound to `thisArg` and invoked
+     * which the value is ranked. The `iteratee` is bound to `thisArg` and invoked
      * with three arguments; (value, index, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4837,10 +4955,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator] The function called per iteration.
+     * @param {Function|Object|string} [iteratee] The function called per iteration.
      *  If a property name or object is provided it is used to create a "_.pluck"
      *  or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the maximum value.
      * @example
      *
@@ -4862,20 +4980,20 @@
      * _.max(characters, 'age');
      * // => { 'name': 'fred', 'age': 40 };
      */
-    function max(collection, iterator, thisArg) {
+    function max(collection, iteratee, thisArg) {
       var computed = -Infinity,
           result = computed,
-          type = typeof iterator;
+          type = typeof iteratee;
 
       // enables use as a callback for functions like `_.map`
-      if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === collection) {
-        iterator = null;
+      if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === collection) {
+        iteratee = null;
       }
-      var noIterator = iterator == null,
-          isArr = noIterator && isArray(collection),
+      var noIteratee = iteratee == null,
+          isArr = noIteratee && isArray(collection),
           isStr = !isArr && isString(collection);
 
-      if (noIterator && !isStr) {
+      if (noIteratee && !isStr) {
         var index = -1,
             iterable = toIterable(collection),
             length = iterable.length;
@@ -4887,12 +5005,12 @@
           }
         }
       } else {
-        iterator = (noIterator && isStr)
+        iteratee = (noIteratee && isStr)
           ? charAtCallback
-          : getCallback(iterator, thisArg, 3);
+          : getCallback(iteratee, thisArg, 3);
 
         baseEach(collection, function(value, index, collection) {
-          var current = iterator(value, index, collection);
+          var current = iteratee(value, index, collection);
           if (current > computed || (current === -Infinity && current === result)) {
             computed = current;
             result = value;
@@ -4904,15 +5022,15 @@
 
     /**
      * Retrieves the minimum value of `collection`. If the collection is empty
-     * or falsey `Infinity` is returned. If an iterator function is provided it
+     * or falsey `Infinity` is returned. If an iteratee function is provided it
      * is executed for each value in the collection to generate the criterion by
-     * which the value is ranked. The `iterator` is bound to `thisArg` and invoked
+     * which the value is ranked. The `iteratee` is bound to `thisArg` and invoked
      * with three arguments; (value, index, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -4920,10 +5038,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function|Object|string} [iterator] The function called per iteration.
+     * @param {Function|Object|string} [iteratee] The function called per iteration.
      *  If a property name or object is provided it is used to create a "_.pluck"
      *  or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the minimum value.
      * @example
      *
@@ -4945,20 +5063,20 @@
      * _.min(characters, 'age');
      * // => { 'name': 'barney', 'age': 36 };
      */
-    function min(collection, iterator, thisArg) {
+    function min(collection, iteratee, thisArg) {
       var computed = Infinity,
           result = computed,
-          type = typeof iterator;
+          type = typeof iteratee;
 
       // enables use as a callback for functions like `_.map`
-      if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === collection) {
-        iterator = null;
+      if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === collection) {
+        iteratee = null;
       }
-      var noIterator = iterator == null,
-          isArr = noIterator && isArray(collection),
+      var noIteratee = iteratee == null,
+          isArr = noIteratee && isArray(collection),
           isStr = !isArr && isString(collection);
 
-      if (noIterator && !isStr) {
+      if (noIteratee && !isStr) {
         var index = -1,
             iterable = toIterable(collection),
             length = iterable.length;
@@ -4970,12 +5088,12 @@
           }
         }
       } else {
-        iterator = (noIterator && isStr)
+        iteratee = (noIteratee && isStr)
           ? charAtCallback
-          : getCallback(iterator, thisArg, 3);
+          : getCallback(iteratee, thisArg, 3);
 
         baseEach(collection, function(value, index, collection) {
-          var current = iterator(value, index, collection);
+          var current = iteratee(value, index, collection);
           if (current < computed || (current === Infinity && current === result)) {
             computed = current;
             result = value;
@@ -5058,10 +5176,10 @@
 
     /**
      * Reduces a collection to a value which is the accumulated result of running
-     * each element in the collection through `iterator`, where each successive
+     * each element in the collection through `iteratee`, where each successive
      * execution consumes the return value of the previous execution. If `accumulator`
      * is not provided the first element of the collection is used as the initial
-     * value. The `iterator` is bound to `thisArg`and invoked with four arguments;
+     * value. The `iteratee` is bound to `thisArg`and invoked with four arguments;
      * (accumulator, value, index|key, collection).
      *
      * @static
@@ -5069,9 +5187,9 @@
      * @alias foldl, inject
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
+     * @param {Function} [iteratee=identity] The function called per iteration.
      * @param {*} [accumulator] The initial value.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the accumulated value.
      * @example
      *
@@ -5082,11 +5200,11 @@
      *   result[key] = n * 3;
      *   return result;
      * }, {});
-     * // => { 'a': 3, 'b': 6, 'c': 9 }
+     * // => { 'a': 3, 'b': 6, 'c': 9 } (property order is not guaranteed)
      */
-    function reduce(collection, iterator, accumulator, thisArg) {
+    function reduce(collection, iteratee, accumulator, thisArg) {
       var func = isArray(collection) ? arrayReduce : baseReduce;
-      return func(collection, getCallback(iterator, thisArg, 4), accumulator, arguments.length < 3, baseEach);
+      return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEach);
     }
 
     /**
@@ -5098,9 +5216,9 @@
      * @alias foldr
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
+     * @param {Function} [iteratee=identity] The function called per iteration.
      * @param {*} [accumulator] The initial value.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the accumulated value.
      * @example
      *
@@ -5108,9 +5226,9 @@
      * _.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []);
      * // => [4, 5, 2, 3, 0, 1]
      */
-    function reduceRight(collection, iterator, accumulator, thisArg) {
+    function reduceRight(collection, iteratee, accumulator, thisArg) {
       var func = isArray(collection) ? arrayReduceRight : baseReduce;
-      return func(collection, getCallback(iterator, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
+      return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
     }
 
     /**
@@ -5152,8 +5270,12 @@
      * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }]
      */
     function reject(collection, predicate, thisArg) {
+      var func = isArray(collection) ? arrayFilter : baseFilter;
+
       predicate = getCallback(predicate, thisArg, 3);
-      return filter(collection, negate(predicate));
+      return func(collection, function(value, index, collection) {
+        return !predicate(value, index, collection);
+      });
     }
 
     /**
@@ -5287,27 +5409,27 @@
      * // => false
      */
     function some(collection, predicate, thisArg) {
+      var func = isArray(collection) ? arraySome : baseSome;
       if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
         predicate = getCallback(predicate, thisArg, 3);
       }
-      var func = isArray(collection) ? arraySome : baseSome;
       return func(collection, predicate);
     }
 
     /**
      * Creates an array of elements, sorted in ascending order by the results of
-     * running each element in a collection through `iterator`. This method performs
+     * running each element in a collection through `iteratee`. This method performs
      * a stable sort, that is, it preserves the original sort order of equal elements.
-     * The `iterator` is bound to `thisArg` and invoked with three arguments;
+     * The `iteratee` is bound to `thisArg` and invoked with three arguments;
      * (value, index|key, collection).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an array of property names is provided for `iterator` the collection
+     * If an array of property names is provided for `iteratee` the collection
      * is sorted by each property value.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -5315,10 +5437,10 @@
      * @memberOf _
      * @category Collection
      * @param {Array|Object|string} collection The collection to iterate over.
-     * @param {Array|Function|Object|string} [iterator=identity] The function
+     * @param {Array|Function|Object|string} [iteratee=identity] The function
      *  called per iteration. If property name(s) or an object is provided it
      *  is used to create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the new sorted array.
      * @example
      *
@@ -5343,28 +5465,28 @@
      * _.map(_.sortBy(characters, ['name', 'age']), _.values);
      * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
      */
-    function sortBy(collection, iterator, thisArg) {
+    function sortBy(collection, iteratee, thisArg) {
       var index = -1,
           length = collection ? collection.length : 0,
-          multi = iterator && isArray(iterator),
+          multi = iteratee && isArray(iteratee),
           result = [];
 
       if (typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER) {
         result.length = length;
       }
       if (!multi) {
-        iterator = getCallback(iterator, thisArg, 3);
+        iteratee = getCallback(iteratee, thisArg, 3);
       }
       baseEach(collection, function(value, key, collection) {
         if (multi) {
-          var length = iterator.length,
+          var length = iteratee.length,
               criteria = Array(length);
 
           while (length--) {
-            criteria[length] = value[iterator[length]];
+            criteria[length] = value == null ? undefined : value[iteratee[length]];
           }
         } else {
-          criteria = iterator(value, key, collection);
+          criteria = iteratee(value, key, collection);
         }
         result[++index] = { 'criteria': criteria, 'index': index, 'value': value };
       });
@@ -5393,7 +5515,7 @@
     function toArray(collection) {
       var length = collection ? collection.length : 0;
       if (typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER) {
-        return slice(collection);
+        return baseSlice(collection);
       }
       return values(collection);
     }
@@ -5501,7 +5623,7 @@
      * and prepends any additional `bind` arguments to those provided to the bound
      * function.
      *
-     * Note: Unlike native `Function#bind` this method does not set the `length`
+     * **Note:** Unlike native `Function#bind` this method does not set the `length`
      * property of bound functions.
      *
      * @static
@@ -5523,12 +5645,12 @@
      */
     function bind(func, thisArg) {
       if (arguments.length < 3) {
-        return createWrapper([func, BIND_FLAG, null, thisArg]);
+        return createWrapper(func, BIND_FLAG, null, thisArg);
       }
       var args = slice(arguments, 2),
-          partialHolders = replaceHolders(args, bind.placeholder);
+          holders = replaceHolders(args, bind.placeholder);
 
-      return basePartial(func, BIND_FLAG | PARTIAL_FLAG, args, partialHolders, thisArg);
+      return basePartial(func, BIND_FLAG | PARTIAL_FLAG, args, holders, thisArg);
     }
 
     /**
@@ -5537,7 +5659,7 @@
      * of method names. If no method names are provided all enumerable function
      * properties, own and inherited, of `object` are bound.
      *
-     * Note: This method does not set the `length` property of bound functions.
+     * **Note:** This method does not set the `length` property of bound functions.
      *
      * @static
      * @memberOf _
@@ -5601,12 +5723,14 @@
      * // => 'hiya fred!'
      */
     function bindKey(object, key) {
-      var data = [key, BIND_FLAG | BIND_KEY_FLAG, null, object];
+      var bitmask = BIND_FLAG | BIND_KEY_FLAG;
       if (arguments.length > 2) {
-        var args = slice(arguments, 2);
-        data.push(args, replaceHolders(args, bindKey.placeholder));
+        var args = slice(arguments, 2),
+            holders = replaceHolders(args, bindKey.placeholder);
       }
-      return createWrapper(data);
+      return args
+        ? createWrapper(key, bitmask, null, object, args, holders)
+        : createWrapper(key, bitmask, null, object);
     }
 
     /**
@@ -5670,7 +5794,7 @@
      * remaining `func` arguments, and so on. The arity of `func` can be specified
      * if `func.length` is not sufficient.
      *
-     * Note: This method does not set the `length` property of curried functions.
+     * **Note:** This method does not set the `length` property of curried functions.
      *
      * @static
      * @memberOf _
@@ -5703,7 +5827,7 @@
      * This method is like `_.curry` except that arguments are applied to `func`
      * in the manner of `_.partialRight` instead of `_.partial`.
      *
-     * Note: This method does not set the `length` property of curried functions.
+     * **Note:** This method does not set the `length` property of curried functions.
      *
      * @static
      * @memberOf _
@@ -5740,7 +5864,7 @@
      * and/or trailing edge of the `wait` timeout. Subsequent calls to the
      * debounced function return the result of the last `func` call.
      *
-     * Note: If `leading` and `trailing` options are `true`, `func` is called on
+     * **Note:** If `leading` and `trailing` options are `true`, `func` is called on
      * the trailing edge of the timeout only if the the debounced function is
      * invoked more than once during the `wait` timeout.
      *
@@ -6061,7 +6185,7 @@
      * prepended to those provided to the new function. This method is similar to
      * `_.bind` except it does **not** alter the `this` binding.
      *
-     * Note: This method does not set the `length` property of partially applied
+     * **Note:** This method does not set the `length` property of partially applied
      * functions.
      *
      * @static
@@ -6079,16 +6203,16 @@
      */
     function partial(func) {
       var args = slice(arguments, 1),
-          partialHolders = replaceHolders(args, partial.placeholder);
+          holders = replaceHolders(args, partial.placeholder);
 
-      return basePartial(func, PARTIAL_FLAG, args, partialHolders);
+      return basePartial(func, PARTIAL_FLAG, args, holders);
     }
 
     /**
      * This method is like `_.partial` except that partially applied arguments
      * are appended to those provided to the new function.
      *
-     * Note: This method does not set the `length` property of partially applied
+     * **Note:** This method does not set the `length` property of partially applied
      * functions.
      *
      * @static
@@ -6117,9 +6241,9 @@
      */
     function partialRight(func) {
       var args = slice(arguments, 1),
-          partialHolders = replaceHolders(args, partialRight.placeholder);
+          holders = replaceHolders(args, partialRight.placeholder);
 
-      return basePartial(func, PARTIAL_RIGHT_FLAG, args, partialHolders);
+      return basePartial(func, PARTIAL_RIGHT_FLAG, args, holders);
     }
 
     /**
@@ -6130,7 +6254,7 @@
      * Subsequent calls to the throttled function return the result of the last
      * `func` call.
      *
-     * Note: If `leading` and `trailing` options are `true`, `func` is called on
+     * **Note:** If `leading` and `trailing` options are `true`, `func` is called on
      * the trailing edge of the timeout only if the the throttled function is
      * invoked more than once during the `wait` timeout.
      *
@@ -6243,7 +6367,7 @@
      * cloning is handled by the method instead. The `customizer` is bound to
      * `thisArg` and invoked with two argument; (value, index|key).
      *
-     * Note: This method is loosely based on the structured clone algorithm. Functions
+     * **Note:** This method is loosely based on the structured clone algorithm. Functions
      * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
      * objects created by constructors other than `Object` are cloned to plain `Object` objects.
      * See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm)
@@ -6306,7 +6430,7 @@
      * is handled by the method instead. The `customizer` is bound to `thisArg`
      * and invoked with two argument; (value, index|key).
      *
-     * Note: This method is loosely based on the structured clone algorithm. Functions
+     * **Note:** This method is loosely based on the structured clone algorithm. Functions
      * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
      * objects created by constructors other than `Object` are cloned to plain `Object` objects.
      * See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm)
@@ -6388,7 +6512,7 @@
      * object for all destination properties that resolve to `undefined`. Once a
      * property is set, additional defaults of the same property are ignored.
      *
-     * Note: See the [documentation example of `_.partialRight`](http://lodash.com/docs#partialRight)
+     * **Note:** See the [documentation example of `_.partialRight`](http://lodash.com/docs#partialRight)
      * for a deep version of this method.
      *
      * @static
@@ -6406,7 +6530,7 @@
       if (object == null) {
         return object;
       }
-      var args = slice(arguments);
+      var args = baseSlice(arguments);
       args.push(assignDefaults);
       return assign.apply(undefined, args);
     }
@@ -6442,7 +6566,7 @@
      * _.findKey(characters, function(chr) {
      *   return chr.age < 40;
      * });
-     * // => 'barney' (property order is not guaranteed across environments)
+     * // => 'barney' (property order is not guaranteed)
      *
      * // using "_.where" callback shorthand
      * _.findKey(characters, { 'age': 1 });
@@ -6505,7 +6629,7 @@
 
     /**
      * Iterates over own and inherited enumerable properties of an object executing
-     * `iterator` for each property. The `iterator` is bound to `thisArg` and invoked
+     * `iteratee` for each property. The `iteratee` is bound to `thisArg` and invoked
      * with three arguments; (value, key, object). Iterator functions may exit
      * iteration early by explicitly returning `false`.
      *
@@ -6513,8 +6637,8 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -6528,13 +6652,13 @@
      * _.forIn(new Shape, function(value, key) {
      *   console.log(key);
      * });
-     * // => logs 'x', 'y', and 'z' (property order is not guaranteed across environments)
+     * // => logs 'x', 'y', and 'z' (property order is not guaranteed)
      */
-    function forIn(object, iterator, thisArg) {
-      if (typeof iterator != 'function' || typeof thisArg != 'undefined') {
-        iterator = baseCallback(iterator, thisArg, 3);
+    function forIn(object, iteratee, thisArg) {
+      if (typeof iteratee != 'function' || typeof thisArg != 'undefined') {
+        iteratee = baseCallback(iteratee, thisArg, 3);
       }
-      return baseFor(object, iterator, keysIn);
+      return baseFor(object, iteratee, keysIn);
     }
 
     /**
@@ -6545,8 +6669,8 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -6562,14 +6686,14 @@
      * });
      * // => logs 'z', 'y', and 'x' assuming `_.forIn ` logs 'x', 'y', and 'z'
      */
-    function forInRight(object, iterator, thisArg) {
-      iterator = baseCallback(iterator, thisArg, 3);
-      return baseForRight(object, iterator, keysIn);
+    function forInRight(object, iteratee, thisArg) {
+      iteratee = baseCallback(iteratee, thisArg, 3);
+      return baseForRight(object, iteratee, keysIn);
     }
 
     /**
-     * Iterates over own enumerable properties of an object executing `iterator`
-     * for each property. The `iterator` is bound to `thisArg` and invoked with
+     * Iterates over own enumerable properties of an object executing `iteratee`
+     * for each property. The `iteratee` is bound to `thisArg` and invoked with
      * three arguments; (value, key, object). Iterator functions may exit iteration
      * early by explicitly returning `false`.
      *
@@ -6577,21 +6701,21 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
      * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(n, key) {
      *   console.log(key);
      * });
-     * // => logs '0', '1', and 'length' (property order is not guaranteed across environments)
+     * // => logs '0', '1', and 'length' (property order is not guaranteed)
      */
-    function forOwn(object, iterator, thisArg) {
-      if (typeof iterator != 'function' || typeof thisArg != 'undefined') {
-        iterator = baseCallback(iterator, thisArg, 3);
+    function forOwn(object, iteratee, thisArg) {
+      if (typeof iteratee != 'function' || typeof thisArg != 'undefined') {
+        iteratee = baseCallback(iteratee, thisArg, 3);
       }
-      return baseForOwn(object, iterator);
+      return baseForOwn(object, iteratee);
     }
 
     /**
@@ -6602,8 +6726,8 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -6612,9 +6736,9 @@
      * });
      * // => logs 'length', '1', and '0' assuming `_.forOwn` logs '0', '1', and 'length'
      */
-    function forOwnRight(object, iterator, thisArg) {
-      iterator = baseCallback(iterator, thisArg, 3);
-      return baseForRight(object, iterator, keys);
+    function forOwnRight(object, iteratee, thisArg) {
+      iteratee = baseCallback(iteratee, thisArg, 3);
+      return baseForRight(object, iteratee, keys);
     }
 
     /**
@@ -6626,14 +6750,14 @@
      * @alias methods
      * @category Object
      * @param {Object} object The object to inspect.
-     * @returns {Array} Returns the new sorted array of property names.
+     * @returns {Array} Returns the new array of property names.
      * @example
      *
      * _.functions(_);
      * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
      */
     function functions(object) {
-      return baseFunctions(object, keysIn);
+      return baseFunctions(object, keysIn(object));
     }
 
     /**
@@ -6862,7 +6986,7 @@
      * instead. The `customizer` is bound to `thisArg` and invoked with three
      * arguments; (value, other, key).
      *
-     * Note: This method supports comparing arrays, booleans, `Date` objects,
+     * **Note:** This method supports comparing arrays, booleans, `Date` objects,
      * numbers, `Object` objects, regexes, and strings. Functions and DOM nodes
      * are **not** supported. Provide a customizer function to extend support
      * for comparing other values.
@@ -6925,7 +7049,7 @@
     /**
      * Checks if `value` is a finite primitive number.
      *
-     * Note: This method is based on ES6 `Number.isFinite`. See the
+     * **Note:** This method is based on ES6 `Number.isFinite`. See the
      * [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.isfinite)
      * for more details.
      *
@@ -6981,7 +7105,7 @@
      * Checks if `value` is the language type of `Object`.
      * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
      *
-     * Note: See the [ES5 spec](http://es5.github.io/#x8) for more details.
+     * **Note:** See the [ES5 spec](http://es5.github.io/#x8) for more details.
      *
      * @static
      * @memberOf _
@@ -7009,7 +7133,7 @@
     /**
      * Checks if `value` is `NaN`.
      *
-     * Note: This method is not the same as native `isNaN` which returns `true`
+     * **Note:** This method is not the same as native `isNaN` which returns `true`
      * for `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
      * for more details.
      *
@@ -7038,6 +7162,27 @@
       return isNumber(value) && value != +value;
     }
 
+    /**
+     * Checks if `value` is a native function.
+     *
+     * @static
+     * @memberOf _
+     * @category Object
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+     */
+    function isNative(value) {
+      if (isFunction(value)) {
+        return reNative.test(fnToString.call(value));
+      }
+      if (value && typeof value == 'object') {
+        return !('constructor' in value) && isHostObject(value)
+          ? reNative.test(value)
+          : reHostCtor.test(toString.call(value));
+      }
+      return false;
+    }
+
     /**
      * Checks if `value` is `null`.
      *
@@ -7061,7 +7206,7 @@
     /**
      * Checks if `value` is classified as a `Number` primitive or object.
      *
-     * Note: To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
+     * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
      * as numbers, use the `_.isFinite` method.
      *
      * @static
@@ -7090,7 +7235,7 @@
      * Checks if `value` is an object created by the `Object` constructor or has
      * a `[[Prototype]]` of `null`.
      *
-     * Note: This method assumes objects created by the `Object` constructor
+     * **Note:** This method assumes objects created by the `Object` constructor
      * have no inherited enumerable properties.
      *
      * @static
@@ -7208,7 +7353,7 @@
      * Shape.prototype.z = 0;
      *
      * _.keys(new Shape);
-     * // => ['x', 'y'] (property order is not guaranteed across environments)
+     * // => ['x', 'y'] (property order is not guaranteed)
      */
     var keys = !nativeKeys ? shimKeys : function(object) {
       object = toObject(object);
@@ -7241,7 +7386,7 @@
      * Shape.prototype.z = 0;
      *
      * _.keysIn(new Shape);
-     * // => ['x', 'y', 'z'] (property order is not guaranteed across environments)
+     * // => ['x', 'y', 'z'] (property order is not guaranteed)
      */
     function keysIn(object) {
       if (object == null) {
@@ -7275,14 +7420,14 @@
 
     /**
      * Creates an object with the same keys as `object` and values generated by
-     * running each own enumerable property of `object` through `iterator`. The
-     * iterator function is bound to `thisArg` and invoked with three arguments;
+     * running each own enumerable property of `object` through `iteratee`. The
+     * iteratee function is bound to `thisArg` and invoked with three arguments;
      * (value, key, object).
      *
-     * If a property name is provided for `iterator` the created "_.pluck" style
+     * If a property name is provided for `iteratee` the created "_.pluck" style
      * callback returns the property value of the given element.
      *
-     * If an object is provided for `iterator` the created "_.where" style callback
+     * If an object is provided for `iteratee` the created "_.where" style callback
      * returns `true` for elements that have the properties of the given object,
      * else `false`.
      *
@@ -7290,10 +7435,10 @@
      * @memberOf _
      * @category Object
      * @param {Object} object The object to iterate over.
-     * @param {Function|Object|string} [iterator=identity] The function called
+     * @param {Function|Object|string} [iteratee=identity] The function called
      *  per iteration. If a property name or object is provided it is used to
      *  create a "_.pluck" or "_.where" style callback respectively.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Object} Returns the new mapped object.
      * @example
      *
@@ -7309,12 +7454,12 @@
      * _.mapValues(characters, 'age');
      * // => { 'fred': 40, 'pebbles': 1 }
      */
-    function mapValues(object, iterator, thisArg) {
+    function mapValues(object, iteratee, thisArg) {
       var result = {};
-      iterator = getCallback(iterator, thisArg, 3);
+      iteratee = getCallback(iteratee, thisArg, 3);
 
       baseForOwn(object, function(value, key, object) {
-        result[key] = iterator(value, key, object);
+        result[key] = iteratee(value, key, object);
       });
       return result;
     }
@@ -7403,11 +7548,15 @@
       if (object == null) {
         return {};
       }
-      if (typeof predicate == 'function') {
-        return basePick(object, negate(getCallback(predicate, thisArg, 3)));
+      var iterable = toObject(object);
+      if (typeof predicate != 'function') {
+        var props = arrayMap(baseFlatten(arguments, false, false, 1), String);
+        return pickByArray(iterable, baseDifference(keysIn(iterable), props));
       }
-      var omitProps = baseFlatten(arguments, false, false, 1);
-      return basePick(toObject(object), baseDifference(keysIn(object), arrayMap(omitProps, String)));
+      predicate = getCallback(predicate, thisArg, 3);
+      return pickByCallback(iterable, function(value, key, object) {
+        return !predicate(value, key, object);
+      });
     }
 
     /**
@@ -7422,7 +7571,7 @@
      * @example
      *
      * _.pairs({ 'barney': 36, 'fred': 40 });
-     * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments)
+     * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed)
      */
     function pairs(object) {
       var index = -1,
@@ -7468,18 +7617,17 @@
       if (object == null) {
         return {};
       }
-      return basePick(toObject(object),
-        typeof predicate == 'function'
-          ? getCallback(predicate, thisArg, 3)
-          : baseFlatten(arguments, false, false, 1)
-      );
+      var iterable = toObject(object);
+      return typeof predicate == 'function'
+        ? pickByCallback(iterable, getCallback(predicate, thisArg, 3))
+        : pickByArray(iterable, baseFlatten(arguments, false, false, 1));
     }
 
     /**
      * An alternative to `_.reduce`; this method transforms `object` to a new
      * `accumulator` object which is the result of running each of its own
-     * enumerable properties through `iterator`, with each execution potentially
-     * mutating the `accumulator` object. The `iterator` is bound to `thisArg`
+     * enumerable properties through `iteratee`, with each execution potentially
+     * mutating the `accumulator` object. The `iteratee` is bound to `thisArg`
      * and invoked with four arguments; (accumulator, value, key, object). Iterator
      * functions may exit iteration early by explicitly returning `false`.
      *
@@ -7487,9 +7635,9 @@
      * @memberOf _
      * @category Object
      * @param {Array|Object} object The object to iterate over.
-     * @param {Function} [iterator=identity] The function called per iteration.
+     * @param {Function} [iteratee=identity] The function called per iteration.
      * @param {*} [accumulator] The custom accumulator value.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {*} Returns the accumulated value.
      * @example
      *
@@ -7506,7 +7654,7 @@
      * });
      * // => { 'a': 3, 'b': 6, 'c': 9 }
      */
-    function transform(object, iterator, accumulator, thisArg) {
+    function transform(object, iteratee, accumulator, thisArg) {
       var isArr = isArrayLike(object);
 
       if (accumulator == null) {
@@ -7520,10 +7668,10 @@
           accumulator = baseCreate(proto);
         }
       }
-      if (iterator) {
-        iterator = getCallback(iterator, thisArg, 4);
+      if (iteratee) {
+        iteratee = getCallback(iteratee, thisArg, 4);
         (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) {
-          return iterator(accumulator, value, index, object);
+          return iteratee(accumulator, value, index, object);
         });
       }
       return accumulator;
@@ -7547,7 +7695,7 @@
      * Shape.prototype.z = 0;
      *
      * _.values(new Shape(2, 1));
-     * // => [2, 1] (property order is not guaranteed across environments)
+     * // => [2, 1] (property order is not guaranteed)
      */
     function values(object) {
       return baseValues(object, keys);
@@ -7572,7 +7720,7 @@
      * Shape.prototype.z = 0;
      *
      * _.valuesIn(new Shape(2, 1));
-     * // => [2, 1, 0] (property order is not guaranteed across environments)
+     * // => [2, 1, 0] (property order is not guaranteed)
      */
     function valuesIn(object) {
       return baseValues(object, keysIn);
@@ -7663,7 +7811,7 @@
      * Converts the characters "&", "<", ">", '"', and "'" in `string` to
      * their corresponding HTML entities.
      *
-     * Note: No other characters are escaped. To escape additional characters
+     * **Note:** No other characters are escaped. To escape additional characters
      * use a third-party library like [_he_](http://mths.be/he).
      *
      * When working with HTML you should always quote attribute values to reduce
@@ -7930,7 +8078,7 @@
      * properties may be accessed as free variables in the template. If a setting
      * object is provided it overrides `_.templateSettings` for the template.
      *
-     * Note: In the development build `_.template` utilizes sourceURLs for easier debugging.
+     * **Note:** In the development build `_.template` utilizes sourceURLs for easier debugging.
      * See the [HTML5 Rocks article on sourcemaps](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
      * for more details.
      *
@@ -8292,7 +8440,7 @@
      * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to their
      * corresponding characters.
      *
-     * Note: No other HTML entities are unescaped. To unescape additional HTML
+     * **Note:** No other HTML entities are unescaped. To unescape additional HTML
      * entities use a third-party library like [_he_](http://mths.be/he).
      *
      * @static
@@ -8350,6 +8498,7 @@
      *
      * @static
      * @memberOf _
+     * @alias iteratee
      * @category Utility
      * @param {*} [func=identity] The value to convert to a callback.
      * @param {*} [thisArg] The `this` binding of the created callback.
@@ -8466,7 +8615,7 @@
         var isStrict = isStrictComparable(value);
 
         flags[index] = isStrict;
-        vals[index] = isStrict ? value : baseClone(value, false);
+        vals[index] = isStrict ? value : baseClone(value);
       }
       return function(object) {
         index = length;
@@ -8523,16 +8672,20 @@
      */
     function mixin(object, source, options) {
       var chain = true,
-          methodNames = source && baseFunctions(source, keys);
+          isObj = isObject(source),
+          noOpts = options == null,
+          props = noOpts && isObj && keys(source),
+          methodNames = props && baseFunctions(source, props);
 
-      if (!source || (!options && !methodNames.length)) {
-        if (options == null) {
+      if ((props && props.length && !methodNames.length) || (noOpts && !isObj)) {
+        if (noOpts) {
           options = source;
         }
+        methodNames = false;
         source = object;
         object = this;
-        methodNames = baseFunctions(source, keys);
       }
+      methodNames || (methodNames = baseFunctions(source, keys(source)));
       if (options === false) {
         chain = false;
       } else if (isObject(options) && 'chain' in options) {
@@ -8540,7 +8693,7 @@
       }
       var index = -1,
           isFunc = isFunction(object),
-          length = methodNames ? methodNames.length : 0;
+          length = methodNames.length;
 
       while (++index < length) {
         var methodName = methodNames[index],
@@ -8624,7 +8777,7 @@
      * `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal,
      * in which case a `radix` of `16` is used.
      *
-     * Note: This method avoids differences in native ES3 and ES5 `parseInt`
+     * **Note:** This method avoids differences in native ES3 and ES5 `parseInt`
      * implementations. See the [ES5 spec](http://es5.github.io/#E)
      * for more details.
      *
@@ -8852,16 +9005,16 @@
     }
 
     /**
-     * Executes the iterator function `n` times, returning an array of the results
-     * of each execution. The `iterator` is bound to `thisArg` and invoked with
+     * Executes the iteratee function `n` times, returning an array of the results
+     * of each execution. The `iteratee` is bound to `thisArg` and invoked with
      * one argument; (index).
      *
      * @static
      * @memberOf _
      * @category Utility
-     * @param {number} n The number of times to execute `iterator`.
-     * @param {Function} [iterator=identity] The function called per iteration.
-     * @param {*} [thisArg] The `this` binding of `iterator`.
+     * @param {number} n The number of times to execute `iteratee`.
+     * @param {Function} [iteratee=identity] The function called per iteration.
+     * @param {*} [thisArg] The `this` binding of `iteratee`.
      * @returns {Array} Returns the array of results.
      * @example
      *
@@ -8874,18 +9027,18 @@
      * _.times(3, function(n) { this.cast(n); }, mage);
      * // => also calls `mage.castSpell(n)` three times
      */
-    function times(n, iterator, thisArg) {
+    function times(n, iteratee, thisArg) {
       n = nativeIsFinite(n = +n) && n > -1 ? n : 0;
-      iterator = baseCallback(iterator, thisArg, 1);
+      iteratee = baseCallback(iteratee, thisArg, 1);
 
       var index = -1,
           result = Array(nativeMin(n, MAX_ARRAY_LENGTH));
 
       while (++index < n) {
         if (index < MAX_ARRAY_LENGTH) {
-          result[index] = iterator(index);
+          result[index] = iteratee(index);
         } else {
-          iterator(index);
+          iteratee(index);
         }
       }
       return result;
@@ -9016,6 +9169,7 @@
     lodash.each = forEach;
     lodash.eachRight = forEachRight;
     lodash.extend = assign;
+    lodash.iteratee = callback;
     lodash.methods = functions;
     lodash.object = zipObject;
     lodash.select = filter;
@@ -9060,6 +9214,7 @@
     lodash.isFinite = isFinite;
     lodash.isFunction = isFunction;
     lodash.isNaN = isNaN;
+    lodash.isNative = isNative;
     lodash.isNull = isNull;
     lodash.isNumber = isNumber;
     lodash.isObject = isObject;
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index c1771afb5..93c5c3717 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -3,69 +3,70 @@
  * Lo-Dash 3.0.0-pre (Custom Build) lodash.com/license | Underscore.js 1.6.0 underscorejs.org/LICENSE
  * Build: `lodash modern -o ./dist/lodash.js`
  */
-;(function(){function n(n,t){for(var r=-1,e=t.length,u=Array(e);++r<e;)u[r]=n[t[r]];return u}function t(n,t){if(n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return 0}function r(n,t,r){r=(r||0)-1;for(var e=n?n.length:0;++r<e;)if(n[r]===t)return r;return-1}function e(n,t){return n.has(t)?0:-1}function u(n){return n.charCodeAt(0)}function o(n,t){for(var r=-1,e=n.length;++r<e&&-1<t.indexOf(n.charAt(r)););return r}function i(n,t){for(var r=n.length;r--&&-1<t.indexOf(n.charAt(r)););return r
-}function f(n,r){return t(n.a,r.a)||n.b-r.b}function a(n,r){for(var e=-1,u=n.a,o=r.a,i=u.length;++e<i;){var f=t(u[e],o[e]);if(f)return f}return n.b-r.b}function c(n){return function(t){for(var r=-1,e=(t=null!=t&&(t+"").replace(V,l).match(H))?t.length:0,u="";++r<e;)u=n(u,t[r],r,t);return u}}function l(n){return Ot[n]}function p(n){return xt[n]}function s(n){return"\\"+Rt[n]}function h(n){return 160>=n&&9<=n&&13>=n||32==n||160==n||5760==n||6158==n||8192<=n&&(8202>=n||8232==n||8233==n||8239==n||8287==n||12288==n||65279==n)
-}function g(n){for(var t=-1,r=n.length;++t<r&&h(n.charCodeAt(t)););return t}function v(n){for(var t=n.length;t--&&h(n.charCodeAt(t)););return t}function y(n){return Et[n]}function d(l){function h(n){if(n&&typeof n=="object"){if(n instanceof V)return n;!Cu(n)&&tu.call(n,"__wrapped__")&&(n=n.__wrapped__)}return new V(n)}function V(n,t){this.__chain__=!!t,this.__wrapped__=n}function H(n,t){for(var r=-1,e=n.length;++r<e&&false!==t(n[r],r,n););return n}function xt(n,t){for(var r=-1,e=n.length;++r<e;)if(!t(n[r],r,n))return false;
-return true}function Et(n,t){for(var r=-1,e=n.length,u=Ce(e);++r<e;)u[r]=t(n[r],r,n);return u}function Ot(n,t){for(var r=-1,e=n.length,u=[];++r<e;){var o=n[r];t(o,r,n)&&u.push(o)}return u}function It(n,t,r,e){var u=-1,o=n.length;for(e&&o&&(r=n[++u]);++u<o;)r=t(r,n[u],u,n);return r}function Rt(n,t,r,e){var u=n.length;for(e&&u&&(r=n[--u]);u--;)r=t(r,n[u],u,n);return r}function St(n,t){for(var r=-1,e=n.length;++r<e;)if(t(n[r],r,n))return true;return false}function Ct(n,t){return typeof n=="undefined"?t:n}function Tt(n,t,r,e){return typeof n!="undefined"&&tu.call(e,r)?n:t
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+var u,o,i=zu(r),f=Ie(r),a=0;r=t.interpolate||X;var c="__p+='";if(r=Ke((t.escape||X).source+"|"+r.source+"|"+(r===P?Z:X).source+"|"+(t.evaluate||X).source+"|$","g"),n.replace(r,function(t,r,e,i,f,l){return e||(e=i),c+=n.slice(a,l).replace(nt,h),r&&(u=true,c+="'+__e("+r+")+'"),f&&(o=true,c+="';"+f+";\n__p+='"),e&&(c+="'+((__t=("+e+"))==null?'':__t)+'"),a=l+t.length,t}),c+="';",(t=t.variable)||(c="with(obj){"+c+"}"),c=(o?c.replace(L,""):c).replace($,"$1").replace(B,"$1;"),c="function("+(t||"obj")+"){"+(t?"":"obj||(obj={});")+"var __t,__p=''"+(u?",__e=_.escape":"")+(o?",__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}":";")+c+"return __p}",t=Ce(function(){return ze(i,"return "+c).apply(_,f)
+}),t.source=c,_e(t))throw t;return t},g.trim=Se,g.trimLeft=function(n,t){return(n=null==n?"":Ve(n))?null==t?n.slice(v(n)):(t=Ve(t),n.slice(i(n,t))):n},g.trimRight=function(n,t){return(n=null==n?"":Ve(n))?null==t?n.slice(0,y(n)+1):(t=Ve(t),n.slice(0,f(n,t)+1)):n},g.trunc=function(n,t){var r=30,e="...";if(we(t))var u="separator"in t?t.separator:u,r="length"in t?+t.length||0:r,e="omission"in t?Ve(t.omission):e;else null!=t&&(r=+t||0);if(n=null==n?"":Ve(n),r>=n.length)return n;var o=r-e.length;if(1>o)return e;
+if(r=n.slice(0,o),null==u)return r+e;if(xe(u)){if(n.slice(o).search(u)){var i,f,a=n.slice(0,o);for(u.global||(u=Ke(u.source,(K.exec(u)||"")+"g")),u.lastIndex=0;i=u.exec(a);)f=i.index;r=r.slice(0,null==f?o:f)}}else n.indexOf(u,o)!=o&&(u=r.lastIndexOf(u),-1<u&&(r=r.slice(0,u)));return r+e},g.unescape=function(n){return n=null==n?"":Ve(n),D.lastIndex=0,D.test(n)?n.replace(D,d):n},g.uniqueId=function(n){var t=++W;return Ve(null==n?"":n)+t},g.all=Jr,g.any=fe,g.detect=Gr,g.foldl=ue,g.foldr=oe,g.head=Br,g.include=Hr,g.inject=ue,We(g,function(){var n={};
+return Gt(g,function(t,r){g.prototype[r]||(n[r]=t)}),n}(),false),g.sample=function(n,t,r){return null==t||r?(n=Nr(n),t=n.length,0<t?n[ir(0,t-1)]:_):(n=ie(n),n.length=Au(0>t?0:+t||0,n.length),n)},Gt(g,function(n,t){var r="sample"!=t;g.prototype[t]||(g.prototype[t]=function(t,e){var u=this.__chain__,o=n(this.__wrapped__,t,e);return u||null!=t&&(!e||r&&typeof t=="function")?new J(o,u):o})}),g.VERSION=b,g.prototype.chain=function(){return this.__chain__=true,this},g.prototype.toJSON=Yr,g.prototype.toString=function(){return Ve(this.__wrapped__)
+},g.prototype.value=Yr,g.prototype.valueOf=Yr,tt(["join","pop","shift"],function(n){var t=He[n];g.prototype[n]=function(){var n=this.__chain__,r=t.apply(this.__wrapped__,arguments);return n?new J(r,n):r}}),tt(["push","reverse","sort","unshift"],function(n){var t=He[n];g.prototype[n]=function(){return t.apply(this.__wrapped__,arguments),this}}),tt(["concat","splice"],function(n){var t=He[n];g.prototype[n]=function(){return new J(t.apply(this.__wrapped__,arguments),this.__chain__)}}),g}var _,b="3.0.0-pre",w=1,j=2,A=4,x=8,O=16,E=32,I=64,k=150,R=16,S="__lodash_"+b.replace(/[-.]/g,"_")+"__",C="Expected a function",F=Math.pow(2,32)-1,T=Math.pow(2,53)-1,U="__lodash_placeholder__",W=0,N=/^[A-Z]+$/,L=/\b__p\+='';/g,$=/\b(__p\+=)''\+/g,B=/(__e\(.*?\)|\b__t\))\+'';/g,D=/&(?:amp|lt|gt|quot|#39|#96);/g,M=/[&<>"'`]/g,z=/<%-([\s\S]+?)%>/g,q=/<%([\s\S]+?)%>/g,P=/<%=([\s\S]+?)%>/g,Z=/\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g,K=/\w*$/,V=/^\s*function[ \n\r\t]+\w/,Y=/^0[xX]/,H=/^\[object .+?Constructor\]$/,J=/[\xC0-\xFF]/g,X=/($^)/,G=/[.*+?^${}()|[\]\/\\]/g,Q=/\bthis\b/,nt=/['\n\r\u2028\u2029\\]/g,tt=/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g,rt=" \t\x0B\f\xa0\ufeff\n\r\u2028\u2029\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000",et="Array ArrayBuffer Date Error Float32Array Float64Array Function Int8Array Int16Array Int32Array Math Number Object RegExp Set String _ clearTimeout document isFinite parseInt setTimeout TypeError Uint8Array Uint8ClampedArray Uint16Array Uint32Array WeakMap window WinRTError".split(" "),ut="[object Arguments]",ot="[object Array]",it="[object Boolean]",ft="[object Date]",at="[object Error]",ct="[object Number]",lt="[object Object]",pt="[object RegExp]",st="[object String]",ht="[object ArrayBuffer]",gt="[object Float32Array]",vt="[object Float64Array]",yt="[object Int8Array]",dt="[object Int16Array]",mt="[object Int32Array]",_t="[object Uint8Array]",bt="[object Uint8ClampedArray]",wt="[object Uint16Array]",jt="[object Uint32Array]",At={};
+At[ut]=At[ot]=At[gt]=At[vt]=At[yt]=At[dt]=At[mt]=At[_t]=At[bt]=At[wt]=At[jt]=true,At[ht]=At[it]=At[ft]=At[at]=At["[object Function]"]=At["[object Map]"]=At[ct]=At[lt]=At[pt]=At["[object Set]"]=At[st]=At["[object WeakMap]"]=false;var xt={};xt[ut]=xt[ot]=xt[ht]=xt[it]=xt[ft]=xt[gt]=xt[vt]=xt[yt]=xt[dt]=xt[mt]=xt[ct]=xt[lt]=xt[pt]=xt[st]=xt[_t]=xt[bt]=xt[wt]=xt[jt]=true,xt[at]=xt["[object Function]"]=xt["[object Map]"]=xt["[object Set]"]=xt["[object WeakMap]"]=false;var Ot={leading:false,maxWait:0,trailing:false},Et={configurable:false,enumerable:false,value:null,writable:false},It={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;","`":"&#96;"},kt={"&amp;":"&","&lt;":"<","&gt;":">","&quot;":'"',"&#39;":"'","&#96;":"`"},Rt={"\xc0":"A","\xc1":"A","\xc2":"A","\xc3":"A","\xc4":"A","\xc5":"A","\xe0":"a","\xe1":"a","\xe2":"a","\xe3":"a","\xe4":"a","\xe5":"a","\xc7":"C","\xe7":"c","\xd0":"D","\xf0":"d","\xc8":"E","\xc9":"E","\xca":"E","\xcb":"E","\xe8":"e","\xe9":"e","\xea":"e","\xeb":"e","\xcc":"I","\xcd":"I","\xce":"I","\xcf":"I","\xec":"i","\xed":"i","\xee":"i","\xef":"i","\xd1":"N","\xf1":"n","\xd2":"O","\xd3":"O","\xd4":"O","\xd5":"O","\xd6":"O","\xd8":"O","\xf2":"o","\xf3":"o","\xf4":"o","\xf5":"o","\xf6":"o","\xf8":"o","\xd9":"U","\xda":"U","\xdb":"U","\xdc":"U","\xf9":"u","\xfa":"u","\xfb":"u","\xfc":"u","\xdd":"Y","\xfd":"y","\xff":"y","\xc6":"AE","\xe6":"ae","\xde":"Th","\xfe":"th","\xdf":"ss","\xd7":" ","\xf7":" "},St={"function":true,object:true},Ct={"\\":"\\","'":"'","\n":"n","\r":"r","\u2028":"u2028","\u2029":"u2029"},Ft=St[typeof window]&&window||this,Tt=St[typeof exports]&&exports&&!exports.nodeType&&exports,St=St[typeof module]&&module&&!module.nodeType&&module,Ut=Tt&&St&&typeof global=="object"&&global;
+!Ut||Ut.global!==Ut&&Ut.window!==Ut&&Ut.self!==Ut||(Ft=Ut);var Ut=St&&St.exports===Tt&&Tt,Wt=m();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(Ft._=Wt, define(function(){return Wt})):Tt&&St?Ut?(St.exports=Wt)._=Wt:Tt._=Wt:Ft._=Wt}).call(this);
\ No newline at end of file
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 13ced1ca4..d1a822643 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -21,8 +21,7 @@
       CURRY_FLAG = 4,
       CURRY_RIGHT_FLAG = 8,
       CURRY_BOUND_FLAG = 16,
-      PARTIAL_FLAG = 32,
-      PARTIAL_RIGHT_FLAG = 64;
+      PARTIAL_FLAG = 32;
 
   /** Used as the property name for wrapper metadata */
   var EXPANDO = '__lodash_' + VERSION.replace(/[-.]/g, '_') + '__';
@@ -118,7 +117,7 @@
   /**
    * Used to convert characters to HTML entities.
    *
-   * Note: Though the ">" character is escaped for symmetry, characters like
+   * **Note:** Though the ">" character is escaped for symmetry, characters like
    * ">" and "/" don't require escaping in HTML and have no special meaning
    * unless they're part of a tag or unquoted attribute value.
    * See [Mathias' article](http://mathiasbynens.be/notes/ambiguous-ampersands)
@@ -219,13 +218,33 @@
         length = array ? array.length : 0;
 
     while (++index < length) {
-      if (array[index] === value) {
+      var other = array[index];
+      if (other === value) {
         return index;
       }
     }
     return -1;
   }
 
+  /**
+   * The base implementation of `_.slice` without support for `start` and `end`
+   * arguments.
+   *
+   * @private
+   * @param {Array} array The array to slice.
+   * @returns {Array} Returns the slice of `array`.
+   */
+  function baseSlice(array) {
+    var index = -1,
+        length = array ? array.length : 0,
+        result = Array(length);
+
+    while (++index < length) {
+      result[index] = array[index];
+    }
+    return result;
+  }
+
   /**
    * Used by `_.sortBy` to compare transformed elements of `collection` and stable
    * sort them in ascending order.
@@ -282,6 +301,9 @@
   /** Used to resolve the decompiled source of functions */
   var fnToString = Function.prototype.toString;
 
+  /** Used to check objects for own properties */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
   /** Used to restore the original `_` reference in `_.noConflict` */
   var oldDash = root._;
 
@@ -297,7 +319,6 @@
   /** Native method references */
   var ceil = Math.ceil,
       floor = Math.floor,
-      hasOwnProperty = objectProto.hasOwnProperty,
       push = arrayProto.push,
       propertyIsEnumerable = objectProto.propertyIsEnumerable,
       splice = arrayProto.splice;
@@ -343,17 +364,17 @@
    *
    * The non-chainable wrapper functions are:
    * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `contains`,
-   * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`,
-   * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`,
-   * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, isDate`,
+   * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`,
+   * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`,
+   * `has`, `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, isDate`,
    * `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`, `isFunction`,
-   * `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`,
-   * `isString`, `isUndefined`, `join`, `kebabCase`, `last`, `lastIndexOf`,
-   * `max`, `min`, `noConflict`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`,
-   * `pop`, `random`, `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`,
-   * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`,
-   * `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`,
-   * `unescape`, `uniqueId`, and `value`
+   * `isNative`, `isNaN`, `isNull`, `isNumber`, `isObject`, `isPlainObject`,
+   * `isRegExp`, `isString`, `isUndefined`, `join`, `kebabCase`, `last`,
+   * `lastIndexOf`, `max`, `min`, `noConflict`, `now`, `pad`, `padLeft`,
+   * `padRight`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`, `repeat`,
+   * `result`, `runInContext`, `shift`, `size`, `snakeCase`, `some`, `sortedIndex`,
+   * `sortedLastIndex`, `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`,
+   * `trunc`, `unescape`, `uniqueId`, and `value`
    *
    * The wrapper function `sample` will return a wrapped value when `n` is
    * provided, otherwise it will return an unwrapped value.
@@ -428,6 +449,18 @@
      * @type boolean
      */
     support.spliceObjects = (splice.call(object, 0, 1), !object[0]);
+
+    /**
+     * Detect if the host objects are detectable (IE < 9).
+     *
+     * @memberOf _.support
+     * @type boolean
+     */
+    try {
+      support.hostObject = !({ 'toString': 0 } + '');
+    } catch(e) {
+      support.hostObject = false;
+    }
   }(0, 0));
 
   /**
@@ -482,15 +515,15 @@
    *
    * @private
    * @param {Array} array The array to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Array} Returns `array`.
    */
-  function arrayEach(array, iterator) {
+  function arrayEach(array, iteratee) {
     var index = -1,
         length = array.length;
 
     while (++index < length) {
-      if (iterator(array[index], index, array) === breakIndicator) {
+      if (iteratee(array[index], index, array) === breakIndicator) {
         break;
       }
     }
@@ -525,16 +558,16 @@
    *
    * @private
    * @param {Array} array The array to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Array} Returns the new mapped array.
    */
-  function arrayMap(array, iterator) {
+  function arrayMap(array, iteratee) {
     var index = -1,
         length = array.length,
         result = Array(length);
 
     while (++index < length) {
-      result[index] = iterator(array[index], index, array);
+      result[index] = iteratee(array[index], index, array);
     }
     return result;
   }
@@ -551,12 +584,13 @@
   function arrayFilter(array, predicate) {
     var index = -1,
         length = array.length,
+        resIndex = -1,
         result = [];
 
     while (++index < length) {
       var value = array[index];
       if (predicate(value, index, array)) {
-        result.push(value);
+        result[++resIndex] = value;
       }
     }
     return result;
@@ -568,13 +602,13 @@
    *
    * @private
    * @param {Array} array The array to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @param {*} [accumulator] The initial value.
    * @param {boolean} [initFromArray=false] Specify using the first element of
    *  `array` as the initial value.
    * @returns {*} Returns the accumulated value.
    */
-  function arrayReduce(array, iterator, accumulator, initFromArray) {
+  function arrayReduce(array, iteratee, accumulator, initFromArray) {
     var index = -1,
         length = array.length;
 
@@ -582,7 +616,7 @@
       accumulator = array[++index];
     }
     while (++index < length) {
-      accumulator = iterator(accumulator, array[index], index, array);
+      accumulator = iteratee(accumulator, array[index], index, array);
     }
     return accumulator;
   }
@@ -593,20 +627,20 @@
    *
    * @private
    * @param {Array} array The array to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @param {*} [accumulator] The initial value.
    * @param {boolean} [initFromArray=false] Specify using the last element of
    *  `array` as the initial value.
    * @returns {*} Returns the accumulated value.
    */
-  function arrayReduceRight(array, iterator, accumulator, initFromArray) {
+  function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
     var length = array.length;
 
     if (initFromArray && length) {
       accumulator = array[--length];
     }
     while (length--) {
-      accumulator = iterator(accumulator, array[length], length, array);
+      accumulator = iteratee(accumulator, array[length], length, array);
     }
     return accumulator;
   }
@@ -648,7 +682,7 @@
 
     while (++index < length) {
       var key = methodNames[index];
-      object[key] = createWrapper([object[key], BIND_FLAG, null, object]);
+      object[key] = createWrapper(object[key], BIND_FLAG, null, object);
     }
     return object;
   }
@@ -721,56 +755,6 @@
     }());
   }
 
-  /**
-   * The base implementation of `createWrapper` which creates the wrapper and
-   * sets its metadata.
-   *
-   * @private
-   * @param {Array} data The metadata array. See `createWrapper` for more details.
-   * @returns {Function} Returns the new function.
-   */
-  function baseCreateWrapper(data) {
-    var bitmask = data[1];
-    if (bitmask == BIND_FLAG) {
-      return createBindWrapper(data);
-    }
-    var partialHolders = data[5];
-    if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !partialHolders.length) {
-      return createPartialWrapper(data);
-    }
-    var func = data[0],
-        arity = data[2],
-        thisArg = data[3],
-        partialArgs = data[4],
-        partialRightArgs = data[6];
-
-    var isBind = bitmask & BIND_FLAG,
-        isBindKey = bitmask & BIND_KEY_FLAG,
-        isCurry = bitmask & CURRY_FLAG,
-        isCurryRight = bitmask & CURRY_RIGHT_FLAG,
-        isCurryBound = bitmask & CURRY_BOUND_FLAG;
-
-    var Ctor = !isBindKey && createCtorWrapper(func),
-        key = func;
-
-    var wrapper = function() {
-      var length = arguments.length,
-          index = length,
-          args = Array(length);
-
-      while (index--) {
-        args[index] = arguments[index];
-      }
-      if (partialArgs) {
-        args = composeArgs(partialArgs, partialHolders, args);
-      }
-      var thisBinding = isBind ? thisArg : this;
-      return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
-    };
-
-    return wrapper;
-  }
-
   /**
    * The base implementation of `_.difference` which accepts a single array
    * of values to exclude.
@@ -804,19 +788,19 @@
    *
    * @private
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Array|Object|string} Returns `collection`.
    */
-  function baseEach(collection, iterator) {
+  function baseEach(collection, iteratee) {
     var length = collection ? collection.length : 0;
     if (!(typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER)) {
-      return baseForOwn(collection, iterator);
+      return baseForOwn(collection, iteratee);
     }
     var index = -1,
         iterable = toIterable(collection);
 
     while (++index < length) {
-      if (iterator(iterable[index], index, iterable) === breakIndicator) {
+      if (iteratee(iterable[index], index, iterable) === breakIndicator) {
         break;
       }
     }
@@ -829,17 +813,17 @@
    *
    * @private
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Array|Object|string} Returns `collection`.
    */
-  function baseEachRight(collection, iterator) {
+  function baseEachRight(collection, iteratee) {
     var length = collection ? collection.length : 0;
     if (!(typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER)) {
-      return baseForOwnRight(collection, iterator);
+      return baseForOwnRight(collection, iteratee);
     }
     var iterable = toIterable(collection);
     while (length--) {
-      if (iterator(iterable[length], length, iterable) === breakIndicator) {
+      if (iteratee(iterable[length], length, iterable) === breakIndicator) {
         break;
       }
     }
@@ -953,24 +937,24 @@
 
   /**
    * The base implementation of `baseForIn` and `baseForOwn` which iterates
-   * over `object` properties returned by `keysFunc` executing `iterator` for
+   * over `object` properties returned by `keysFunc` executing `iteratee` for
    * each property. Iterator functions may exit iteration early by explicitly
    * returning `false`.
    *
    * @private
    * @param {Object} object The object to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @param {Function} keysFunc The function to get the keys of `object`.
    * @returns {Object} Returns `object`.
    */
-  function baseFor(object, iterator, keysFunc) {
+  function baseFor(object, iteratee, keysFunc) {
     var index = -1,
         props = keysFunc(object),
         length = props.length;
 
     while (++index < length) {
       var key = props[index];
-      if (iterator(object[key], key, object) === breakIndicator) {
+      if (iteratee(object[key], key, object) === breakIndicator) {
         break;
       }
     }
@@ -983,17 +967,17 @@
    *
    * @private
    * @param {Object} object The object to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @param {Function} keysFunc The function to get the keys of `object`.
    * @returns {Object} Returns `object`.
    */
-  function baseForRight(object, iterator, keysFunc) {
+  function baseForRight(object, iteratee, keysFunc) {
     var props = keysFunc(object),
         length = props.length;
 
     while (length--) {
       var key = props[length];
-      if (iterator(object[key], key, object) === breakIndicator) {
+      if (iteratee(object[key], key, object) === breakIndicator) {
         break;
       }
     }
@@ -1006,11 +990,11 @@
    *
    * @private
    * @param {Object} object The object to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Object} Returns `object`.
    */
-  function baseForIn(object, iterator) {
-    return baseFor(object, iterator, keysIn);
+  function baseForIn(object, iteratee) {
+    return baseFor(object, iteratee, keysIn);
   }
 
   /**
@@ -1019,11 +1003,11 @@
    *
    * @private
    * @param {Object} object The object to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Object} Returns `object`.
    */
-  function baseForOwn(object, iterator) {
-    return baseFor(object, iterator, keys);
+  function baseForOwn(object, iteratee) {
+    return baseFor(object, iteratee, keys);
   }
 
   /**
@@ -1032,32 +1016,32 @@
    *
    * @private
    * @param {Object} object The object to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Object} Returns `object`.
    */
-  function baseForOwnRight(object, iterator) {
-    return baseForRight(object, iterator, keys);
+  function baseForOwnRight(object, iteratee) {
+    return baseForRight(object, iteratee, keys);
   }
 
   /**
-   * The base implementation of `_.functions` which creates an array of function
-   * property names from those returned by `keysFunc`.
+   * The base implementation of `_.functions` which creates an array of
+   * `object` function property names filtered from those provided.
    *
    * @private
    * @param {Object} object The object to inspect.
-   * @param {Function} keysFunc The function to get the keys of `object`.
-   * @returns {Array} Returns the new sorted array of property names.
+   * @param {Array} props The property names to filter.
+   * @returns {Array} Returns the new array of filtered property names.
    */
-  function baseFunctions(object, keysFunc) {
+  function baseFunctions(object, props) {
     var index = -1,
-        props = keysFunc(object),
         length = props.length,
+        resIndex = -1,
         result = [];
 
     while (++index < length) {
       var key = props[index];
       if (isFunction(object[key])) {
-        result.push(key);
+        result[++resIndex] = key;
       }
     }
     return result;
@@ -1215,14 +1199,14 @@
    *
    * @private
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @returns {Array} Returns the new mapped array.
    */
-  function baseMap(collection, iterator) {
+  function baseMap(collection, iteratee) {
     var result = [];
 
     baseEach(collection, function(value, key, collection) {
-      result.push(iterator(value, key, collection));
+      result.push(iteratee(value, key, collection));
     });
     return result;
   }
@@ -1241,51 +1225,13 @@
    */
   function basePartial(func, bitmask, args, holders, thisArg) {
     if (func) {
-      var data = func[EXPANDO],
-          arity = data ? data[2] : func.length;
+      var arity = func.length;
 
       arity -= args.length;
     }
-    var isPartial = bitmask & PARTIAL_FLAG,
-        newData = [func, bitmask, arity, thisArg, null, null];
-
-    newData[isPartial ? 4 : 6] = args;
-    newData[isPartial ? 5 : 7] = holders;
-    return createWrapper(newData);
-  }
-
-  /**
-   * The base implementation of `_.pick` without support for `this` binding
-   * and individual property name arguments.
-   *
-   * @private
-   * @param {Object} object The source object.
-   * @param {Function|string[]} predicate The function called per iteration or
-   *  property names to pick.
-   * @returns {Object} Returns the new object.
-   */
-  function basePick(object, predicate) {
-    var result = {};
-
-    if (typeof predicate == 'function') {
-      baseForIn(object, function(value, key, object) {
-        if (predicate(value, key, object)) {
-          result[key] = value;
-        }
-      });
-      return result;
-    }
-    var index = -1,
-        props = predicate,
-        length = props.length;
-
-    while (++index < length) {
-      var key = props[index];
-      if (key in object) {
-        result[key] = object[key];
-      }
-    }
-    return result;
+    return (bitmask & PARTIAL_FLAG)
+      ? createWrapper(func, bitmask, arity, thisArg, args, holders)
+      : createWrapper(func, bitmask, arity, thisArg, null, null, args, holders);
   }
 
   /**
@@ -1308,18 +1254,18 @@
    *
    * @private
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @param {*} accumulator The initial value.
    * @param {boolean} initFromCollection Specify using the first or last element
    *  of `collection` as the initial value.
    * @param {Function} eachFunc The function to iterate over `collection`.
    * @returns {*} Returns the accumulated value.
    */
-  function baseReduce(collection, iterator, accumulator, initFromCollection, eachFunc) {
+  function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
     eachFunc(collection, function(value, index, collection) {
       accumulator = initFromCollection
         ? (initFromCollection = false, value)
-        : iterator(accumulator, value, index, collection)
+        : iteratee(accumulator, value, index, collection)
     });
     return accumulator;
   }
@@ -1351,24 +1297,24 @@
    * @private
    * @param {Array} array The array to inspect.
    * @param {*} value The value to evaluate.
-   * @param {Function} iterator The function called per iteration.
+   * @param {Function} iteratee The function called per iteration.
    * @param {boolean} [retHighest=false] Specify returning the highest, instead
    *  of the lowest, index at which a value should be inserted into `array`.
    * @returns {number} Returns the index at which `value` should be inserted
    *  into `array`.
    */
-  function baseSortedIndex(array, value, iterator, retHighest) {
+  function baseSortedIndex(array, value, iteratee, retHighest) {
     var low = 0,
         high = array ? array.length : low;
 
-    value = iterator(value);
+    value = iteratee(value);
     var hintNum = typeof value == 'number' ||
       (value != null && isFunction(value.valueOf) && typeof value.valueOf() == 'number');
 
     while (low < high) {
       var mid = (low + high) >>> 1,
-          computed = iterator(array[mid]),
-          setLow = retHighest ? computed <= value : computed < value;
+          computed = iteratee(array[mid]),
+          setLow = retHighest ? (computed <= value) : (computed < value);
 
       if (hintNum && typeof computed != 'undefined') {
         computed = +computed;
@@ -1389,22 +1335,22 @@
    *
    * @private
    * @param {Array} array The array to inspect.
-   * @param {Function} [iterator] The function called per iteration.
+   * @param {Function} [iteratee] The function called per iteration.
    * @returns {Array} Returns the new duplicate-value-free array.
    */
-  function baseUniq(array, iterator) {
+  function baseUniq(array, iteratee) {
     var index = -1,
         indexOf = getIndexOf(),
         length = array.length,
         result = [],
-        seen = iterator ? [] : result;
+        seen = iteratee ? [] : result;
 
     while (++index < length) {
       var value = array[index],
-          computed = iterator ? iterator(value, index, array) : value;
+          computed = iteratee ? iteratee(value, index, array) : value;
 
       if (indexOf(seen, computed) < 0) {
-        if (iterator) {
+        if (iteratee) {
           seen.push(computed);
         }
         result.push(value);
@@ -1468,7 +1414,7 @@
   /**
    * Creates a function that aggregates a collection, creating an accumulator
    * object composed from the results of running each element in the collection
-   * through `iterator`. The given setter function sets the keys and values of
+   * through `iteratee`. The given setter function sets the keys and values of
    * the accumulator object. If `initializer` is provided it is used to initialize
    * the accumulator object.
    *
@@ -1478,9 +1424,9 @@
    * @returns {Function} Returns the new aggregator function.
    */
   function createAggregator(setter, initializer) {
-    return function(collection, iterator, thisArg) {
+    return function(collection, iteratee, thisArg) {
       var result = initializer ? initializer() : {};
-      iterator = baseCallback(iterator, thisArg, 3);
+      iteratee = baseCallback(iteratee, thisArg, 3);
 
       if (isArray(collection)) {
         var index = -1,
@@ -1488,11 +1434,11 @@
 
         while (++index < length) {
           var value = collection[index];
-          setter(result, value, iterator(value, index, collection), collection);
+          setter(result, value, iteratee(value, index, collection), collection);
         }
       } else {
         baseEach(collection, function(value, key, collection) {
-          setter(result, value, iterator(value, key, collection), collection);
+          setter(result, value, iteratee(value, key, collection), collection);
         });
       }
       return result;
@@ -1500,17 +1446,16 @@
   }
 
   /**
-   * Creates a function that invokes the function specified in the metadata
-   * with its associated `this` binding.
+   * Creates a function that wraps `func` and invokes it with the `this`
+   * binding of `thisArg`.
    *
    * @private
-   * @param {Array} data The metadata array. See `createWrapper` for more details.
-   * @returns {Function} Returns the new bound function.
+   * @param {Function} func The function to bind.
+   * @param {*} [thisArg] The `this` binding of `func`.
+   * @returns {Function} Returns the new wrapped function.
    */
-  function createBindWrapper(data) {
-    var func = data[0],
-        thisArg = data[3],
-        Ctor = createCtorWrapper(func);
+  function createBindWrapper(func, thisArg) {
+    var Ctor = createCtorWrapper(func);
 
     function wrapper() {
       return (this instanceof wrapper ? Ctor : func).apply(thisArg, arguments);
@@ -1538,25 +1483,67 @@
   }
 
   /**
-   * Creates a function that invokes the function specified in the metadata
-   * with its associated partially applied arguments and optional `this` binding.
+   * Creates a function that wraps `func` and invokes it with optional `this`
+   * binding of, partial application, and currying.
    *
    * @private
-   * @param {Array} data The metadata array. See `createWrapper` for more details.
+   * @param {Function|string} func The function or method name to reference.
+   * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+   * @param {number} arity The arity of `func`.
+   * @param {*} [thisArg] The `this` binding of `func`.
+   * @param {Array} [partialArgs] An array of arguments to prepend to those provided to the new function.
+   * @param {Array} [partialHolders] An array of `partialArgs` placeholder indexes.
+   * @param {Array} [partialRightArgs] An array of arguments to append to those provided to the new function.
+   * @param {Array} [partialRightHolders] An array of `partialRightArgs` placeholder indexes.
+   * @returns {Function} Returns the new function.
+   */
+  function createHybridWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders) {
+    var isBind = bitmask & BIND_FLAG,
+        isBindKey = bitmask & BIND_KEY_FLAG,
+        isCurry = bitmask & CURRY_FLAG,
+        isCurryRight = bitmask & CURRY_RIGHT_FLAG,
+        isCurryBound = bitmask & CURRY_BOUND_FLAG;
+
+    var Ctor = !isBindKey && createCtorWrapper(func),
+        key = func;
+
+    function wrapper() {
+      var length = arguments.length,
+          index = length,
+          args = Array(length);
+
+      while (index--) {
+        args[index] = arguments[index];
+      }
+      if (partialArgs) {
+        args = composeArgs(partialArgs, partialHolders, args);
+      }
+      var thisBinding = isBind ? thisArg : this;
+      return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args);
+    }
+    return wrapper;
+  }
+
+  /**
+   * Creates a function that wraps `func` and invokes it with the optional `this`
+   * binding of `thisArg` and the `partialArgs` prepended to those provided to
+   * the wrapper.
+   *
+   * @private
+   * @param {Function} func The function to partially apply arguments to.
+   * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details.
+   * @param {Array} partialArgs An array of arguments to prepend to those provided to the new function.
+   * @param {*} [thisArg] The `this` binding of `func`.
    * @returns {Function} Returns the new bound function.
    */
-  function createPartialWrapper(data) {
-    var func = data[0],
-        thisArg = data[3],
-        partialArgs = data[4];
-
-    var isBind = data[1] & BIND_FLAG,
+  function createPartialWrapper(func, bitmask, partialArgs, thisArg) {
+    var isBind = bitmask & BIND_FLAG,
         Ctor = createCtorWrapper(func);
 
     function wrapper() {
       // avoid `arguments` object use disqualifying optimizations by
       // converting it to an array before passing it to `composeArgs`
-      var argsIndex = 0,
+      var argsIndex = -1,
           argsLength = arguments.length,
           leftIndex = -1,
           leftLength = partialArgs.length,
@@ -1566,7 +1553,7 @@
         args[leftIndex] = partialArgs[leftIndex];
       }
       while (argsLength--) {
-        args[leftIndex++] = arguments[argsIndex++];
+        args[leftIndex++] = arguments[++argsIndex];
       }
       return (this instanceof wrapper ? Ctor : func).apply(isBind ? thisArg : this, args);
     }
@@ -1578,9 +1565,8 @@
    * `this` binding and partially applied arguments.
    *
    * @private
-   * @param {Array} data The metadata array.
-   * @param {Function|string} data[0] The function or method name to reference.
-   * @param {number} data[1] The bitmask of flags to compose.
+   * @param {Function|string} func The function or method name to reference.
+   * @param {number} bitmask The bitmask of flags.
    *  The bitmask may be composed of the following flags:
    *   1  - `_.bind`
    *   2  - `_.bindKey`
@@ -1589,42 +1575,36 @@
    *   16 - `_.curry` or `_.curryRight` of a bound function
    *   32 - `_.partial`
    *   64 - `_.partialRight`
-   * @param {number} data[2] The arity of `data[0]`.
-   * @param {*} [data[3]] The `this` binding of `data[0]`.
-   * @param {Array} [data[4]] An array of arguments to prepend to those
-   *  provided to the new function.
-   * @param {Array} [data[5]] An array of `data[4]` placeholder indexes.
-   * @param {Array} [data[6]] An array of arguments to append to those
-   *  provided to the new function.
-   * @param {Array} [data[7]] An array of `data[6]` placeholder indexes.
+   * @param {number} arity The arity of `func`.
+   * @param {*} [thisArg] The `this` binding of `func`.
+   * @param {Array} [partialArgs] An array of arguments to prepend to those provided to the new function.
+   * @param {Array} [partialHolders] An array of `partialArgs` placeholder indexes.
+   * @param {Array} [partialRightArgs] An array of arguments to append to those provided to the new function.
+   * @param {Array} [partialRightHolders] An array of `partialRightArgs` placeholder indexes.
    * @returns {Function} Returns the new function.
    */
-  function createWrapper(data) {
-    var func = data[0],
-        bitmask = data[1];
-
-    var isBind = bitmask & BIND_FLAG,
-        isBindKey = bitmask & BIND_KEY_FLAG,
-        isPartial = bitmask & PARTIAL_FLAG,
-        isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
-
+  function createWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders) {
+    var isBindKey = bitmask & BIND_KEY_FLAG;
     if (!isFunction(func)) {
       throw new TypeError(FUNC_ERROR_TEXT);
     }
-    var arity = data[2],
-        partialArgs = data[4],
-        partialRightArgs = data[6];
-
+    var isPartial = bitmask & PARTIAL_FLAG;
     if (isPartial && !partialArgs.length) {
+      bitmask &= ~PARTIAL_FLAG;
       isPartial = false;
-      data[1] = (bitmask &= ~PARTIAL_FLAG);
-      data[4] = data[5] = partialArgs = null;
+      partialArgs = partialHolders = null;
     }
     if (arity == null) {
-      arity = isBindKey ? 0 : func.length;
+      arity = func.length;
     }
-    data[2] = nativeMax(arity, 0);
-    return baseCreateWrapper(data);
+    if (bitmask == BIND_FLAG) {
+      var result = createBindWrapper(func, thisArg);
+    } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !partialHolders.length) {
+      result = createPartialWrapper(func, bitmask, partialArgs, thisArg);
+    } else {
+      result = createHybridWrapper(func, bitmask, arity, thisArg, partialArgs, partialHolders, partialRightArgs, partialRightHolders);
+    }
+    return result;
   }
 
   /**
@@ -1643,17 +1623,46 @@
   }
 
   /**
-   * Checks if `value` is a native function.
+   * A specialized version of `_.pick` that picks `object` properties
+   * specified by the `props` array.
    *
    * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+   * @param {Object} object The source object.
+   * @param {string[]} props The property names to pick.
+   * @returns {Object} Returns the new object.
    */
-  function isNative(value) {
-    var type = typeof value;
-    return type == 'function'
-      ? reNative.test(fnToString.call(value))
-      : (value && type == 'object' && reHostCtor.test(toString.call(value))) || false;
+  function pickByArray(object, props) {
+    var index = -1,
+        length = props.length,
+        result = {};
+
+    while (++index < length) {
+      var key = props[index];
+      if (key in object) {
+        result[key] = object[key];
+      }
+    }
+    return result;
+  }
+
+  /**
+   * A specialized version of `_.pick` that picks `object` properties
+   * the predicate returns truthy for.
+   *
+   * @private
+   * @param {Object} object The source object.
+   * @param {Function} predicate The function called per iteration.
+   * @returns {Object} Returns the new object.
+   */
+  function pickByCallback(object, predicate) {
+    var result = {};
+
+    baseForIn(object, function(value, key, object) {
+      if (predicate(value, key, object)) {
+        result[key] = value;
+      }
+    });
+    return result;
   }
 
   /**
@@ -1668,12 +1677,13 @@
   function replaceHolders(array, placeholder) {
     var index = -1,
         length = array.length,
+        resIndex = -1,
         result = [];
 
     while (++index < length) {
       if (array[index] === placeholder) {
         array[index] = PLACEHOLDER;
-        result.push(index);
+        result[++resIndex] = index;
       }
     }
     return result;
@@ -1708,22 +1718,23 @@
    *
    * @private
    * @param {Array} array The array to inspect.
-   * @param {Function} [iterator] The function called per iteration.
+   * @param {Function} [iteratee] The function called per iteration.
    * @returns {Array} Returns the new duplicate-value-free array.
    */
-  function sortedUniq(array, iterator) {
+  function sortedUniq(array, iteratee) {
     var seen,
         index = -1,
         length = array.length,
+        resIndex = -1,
         result = [];
 
     while (++index < length) {
       var value = array[index],
-          computed = iterator ? iterator(value, index, array) : value;
+          computed = iteratee ? iteratee(value, index, array) : value;
 
       if (!index || seen !== computed) {
         seen = computed;
-        result.push(value);
+        result[++resIndex] = value;
       }
     }
     return result;
@@ -1791,8 +1802,12 @@
   }
 
   /**
-   * Creates an array excluding all values of the provided arrays using strict
-   * equality for comparisons, i.e. `===`.
+   * Creates an array excluding all values of the provided arrays using
+   * `SameValueZero` for equality comparisons.
+   *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
    *
    * @static
    * @memberOf _
@@ -1958,10 +1973,14 @@
 
   /**
    * Gets the index at which the first occurrence of `value` is found in `array`
-   * using strict equality for comparisons, i.e. `===`. If `fromIndex` is negative,
+   * using `SameValueZero` for equality comparisons. If `fromIndex` is negative,
    * it is used as the offset from the end of the collection. If `array` is
    * sorted providing `true` for `fromIndex` performs a faster binary search.
    *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
+   *
    * @static
    * @memberOf _
    * @category Array
@@ -2019,7 +2038,11 @@
 
   /**
    * Creates an array of unique values present in all provided arrays using
-   * strict equality for comparisons, i.e. `===`.
+   * `SameValueZero` for equality comparisons.
+   *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
    *
    * @static
    * @memberOf _
@@ -2120,7 +2143,8 @@
       index = (fromIndex < 0 ? nativeMax(index + fromIndex, 0) : nativeMin(fromIndex || 0, index - 1)) + 1;
     }
     while (index--) {
-      if (array[index] === value) {
+      var other = array[index];
+      if (other === value) {
         return index;
       }
     }
@@ -2153,7 +2177,7 @@
   /**
    * Slices `array` from the `start` index up to, but not including, the `end` index.
    *
-   * Note: This function is used instead of `Array#slice` to support node lists
+   * **Note:** This function is used instead of `Array#slice` to support node lists
    * in IE < 9 and to ensure dense arrays are returned.
    *
    * @static
@@ -2176,6 +2200,9 @@
     if (end < 0) {
       end += length;
     }
+    if (end && end == length && !start) {
+      return baseSlice(array);
+    }
     length = start > end ? 0 : (end - start);
 
     var result = Array(length);
@@ -2188,14 +2215,14 @@
   /**
    * Uses a binary search to determine the lowest index at which a value should
    * be inserted into a given sorted array in order to maintain the sort order
-   * of the array. If an iterator function is provided it is executed for `value`
-   * and each element of `array` to compute their sort ranking. The iterator
+   * of the array. If an iteratee function is provided it is executed for `value`
+   * and each element of `array` to compute their sort ranking. The iteratee
    * function is bound to `thisArg` and invoked with one argument; (value).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -2204,10 +2231,10 @@
    * @category Array
    * @param {Array} array The array to inspect.
    * @param {*} value The value to evaluate.
-   * @param {Function|Object|string} [iterator=identity] The function called
+   * @param {Function|Object|string} [iteratee=identity] The function called
    *  per iteration. If a property name or object is provided it is used to
    *  create a "_.pluck" or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {number} Returns the index at which `value` should be inserted
    *  into `array`.
    * @example
@@ -2220,7 +2247,7 @@
    *
    * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } };
    *
-   * // using an iterator function
+   * // using an iteratee function
    * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) {
    *   return this.data[word];
    * }, dict);
@@ -2230,9 +2257,9 @@
    * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
    * // => 1
    */
-  function sortedIndex(array, value, iterator, thisArg) {
-    iterator = iterator == null ? identity : baseCallback(iterator, thisArg, 1);
-    return baseSortedIndex(array, value, iterator);
+  function sortedIndex(array, value, iteratee, thisArg) {
+    iteratee = iteratee == null ? identity : baseCallback(iteratee, thisArg, 1);
+    return baseSortedIndex(array, value, iteratee);
   }
 
   /**
@@ -2264,7 +2291,11 @@
 
   /**
    * Creates an array of unique values, in order, of the provided arrays using
-   * strict equality for comparisons, i.e. `===`.
+   * `SameValueZero` for equality comparisons.
+   *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
    *
    * @static
    * @memberOf _
@@ -2281,30 +2312,34 @@
   }
 
   /**
-   * Creates a duplicate-value-free version of an array using strict equality
-   * for comparisons, i.e. `===`. Providing `true` for `isSorted` performs a
-   * faster search algorithm for sorted arrays. If an iterator function is
-   * provided it is executed for each value in the array to generate the criterion
-   * by which uniqueness is computed. The `iterator` is bound to `thisArg` and
-   * invoked with three arguments; (value, index, array).
+   * Creates a duplicate-value-free version of an array using `SameValueZero`
+   * for equality comparisons. Providing `true` for `isSorted` performs a faster
+   * search algorithm for sorted arrays. If an iteratee function is provided it
+   * is executed for each value in the array to generate the criterion by which
+   * uniqueness is computed. The `iteratee` is bound to `thisArg` and invoked
+   * with three arguments; (value, index, array).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
+   *
    * @static
    * @memberOf _
    * @alias unique
    * @category Array
    * @param {Array} array The array to inspect.
    * @param {boolean} [isSorted=false] Specify the array is sorted.
-   * @param {Function|Object|string} [iterator] The function called per iteration.
+   * @param {Function|Object|string} [iteratee] The function called per iteration.
    *  If a property name or object is provided it is used to create a "_.pluck"
    *  or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Array} Returns the new duplicate-value-free array.
    * @example
    *
@@ -2315,7 +2350,7 @@
    * _.uniq([1, 1, 2], true);
    * // => [1, 2]
    *
-   * // using an iterator function
+   * // using an iteratee function
    * _.uniq([1, 2.5, 1.5, 2], function(n) { return this.floor(n); }, Math);
    * // => [1, 2.5]
    *
@@ -2323,7 +2358,7 @@
    * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
    * // => [{ 'x': 1 }, { 'x': 2 }]
    */
-  function uniq(array, isSorted, iterator, thisArg) {
+  function uniq(array, isSorted, iteratee, thisArg) {
     var length = array ? array.length : 0;
     if (!length) {
       return [];
@@ -2331,21 +2366,21 @@
     // juggle arguments
     var type = typeof isSorted;
     if (type != 'boolean' && isSorted != null) {
-      thisArg = iterator;
-      iterator = isSorted;
+      thisArg = iteratee;
+      iteratee = isSorted;
       isSorted = false;
 
       // enables use as a callback for functions like `_.map`
-      if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === array) {
-        iterator = null;
+      if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === array) {
+        iteratee = null;
       }
     }
-    if (iterator != null) {
-      iterator = baseCallback(iterator, thisArg, 3);
+    if (iteratee != null) {
+      iteratee = baseCallback(iteratee, thisArg, 3);
     }
     return (isSorted && getIndexOf() == baseIndexOf)
-      ? sortedUniq(array, iterator)
-      : baseUniq(array, iterator);
+      ? sortedUniq(array, iteratee)
+      : baseUniq(array, iteratee);
   }
 
   /**
@@ -2378,8 +2413,12 @@
   }
 
   /**
-   * Creates an array excluding all provided values using strict equality for
-   * comparisons, i.e. `===`.
+   * Creates an array excluding all provided values using `SameValueZero` for
+   * equality comparisons.
+   *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
    *
    * @static
    * @memberOf _
@@ -2392,8 +2431,8 @@
    * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
    * // => [2, 3, 4]
    */
-  function without() {
-    return baseDifference(arguments[0], slice(arguments, 1));
+  function without(array) {
+    return baseDifference(array, slice(arguments, 1));
   }
 
   /**
@@ -2412,7 +2451,13 @@
    * // => [['fred', 30, true], ['barney', 40, false]]
    */
   function zip() {
-    return unzip(arguments);
+    var length = arguments.length,
+        array = Array(length);
+
+    while (length--) {
+      array[length] = arguments[length];
+    }
+    return unzip(array);
   }
 
   /**
@@ -2559,9 +2604,13 @@
   /*--------------------------------------------------------------------------*/
 
   /**
-   * Checks if `value` is present in `collection` using strict equality for
-   * comparisons, i.e. `===`. If `fromIndex` is negative, it is used as the
-   * offset from the end of the collection.
+   * Checks if `value` is present in `collection` using  `SameValueZero` for
+   * equality comparisons. If `fromIndex` is negative, it is used as the offset
+   * from the end of the collection.
+   *
+   * **Note:** `SameValueZero` is like strict equality, e.g. `===`, except that
+   * `NaN` matches `NaN`. See the [ES6 spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero)
+   * for more details.
    *
    * @static
    * @memberOf _
@@ -2596,15 +2645,15 @@
 
   /**
    * Creates an object composed of keys generated from the results of running
-   * each element of `collection` through `iterator`. The corresponding value
-   * of each key is the number of times the key was returned by `iterator`.
-   * The `iterator` is bound to `thisArg` and invoked with three arguments;
+   * each element of `collection` through `iteratee`. The corresponding value
+   * of each key is the number of times the key was returned by `iteratee`.
+   * The `iteratee` is bound to `thisArg` and invoked with three arguments;
    * (value, index|key, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -2612,10 +2661,10 @@
    * @memberOf _
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [iterator=identity] The function called
+   * @param {Function|Object|string} [iteratee=identity] The function called
    *  per iteration. If a property name or object is provided it is used to
    *  create a "_.pluck" or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Object} Returns the composed aggregate object.
    * @example
    *
@@ -2674,10 +2723,10 @@
    * // => false
    */
   function every(collection, predicate, thisArg) {
+    var func = isArray(collection) ? arrayEvery : baseEvery;
     if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
       predicate = baseCallback(predicate, thisArg, 3);
     }
-    var func = isArray(collection) ? arrayEvery : baseEvery;
     return func(collection, predicate);
   }
 
@@ -2722,9 +2771,9 @@
    * // => [{ 'name': 'barney', 'age': 36 }]
    */
   function filter(collection, predicate, thisArg) {
-    predicate = baseCallback(predicate, thisArg, 3);
-
     var func = isArray(collection) ? arrayFilter : baseFilter;
+
+    predicate = baseCallback(predicate, thisArg, 3);
     return func(collection, predicate);
   }
 
@@ -2809,12 +2858,12 @@
   }
 
   /**
-   * Iterates over elements of `collection` executing `iterator` for each
-   * element. The `iterator` is bound to `thisArg` and invoked with three arguments;
+   * Iterates over elements of `collection` executing `iteratee` for each
+   * element. The `iteratee` is bound to `thisArg` and invoked with three arguments;
    * (value, index|key, collection). Iterator functions may exit iteration early
    * by explicitly returning `false`.
    *
-   * Note: As with other "Collections" methods, objects with a `length` property
+   * **Note:** As with other "Collections" methods, objects with a `length` property
    * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn`
    * may be used for object iteration.
    *
@@ -2823,8 +2872,8 @@
    * @alias each
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} [iterator=identity] The function called per iteration.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {Function} [iteratee=identity] The function called per iteration.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Array|Object|string} Returns `collection`.
    * @example
    *
@@ -2832,25 +2881,25 @@
    * // => logs each value and returns the array
    *
    * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); });
-   * // => logs each value-key pair and returns the object (property order is not guaranteed across environments)
+   * // => logs each value-key pair and returns the object (property order is not guaranteed)
    */
-  function forEach(collection, iterator, thisArg) {
-    return (typeof iterator == 'function' && typeof thisArg == 'undefined' && isArray(collection))
-      ? arrayEach(collection, iterator)
-      : baseEach(collection, baseCallback(iterator, thisArg, 3));
+  function forEach(collection, iteratee, thisArg) {
+    return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection))
+      ? arrayEach(collection, iteratee)
+      : baseEach(collection, baseCallback(iteratee, thisArg, 3));
   }
 
   /**
    * Creates an object composed of keys generated from the results of running
-   * each element of `collection` through `iterator`. The corresponding
+   * each element of `collection` through `iteratee`. The corresponding
    * value of each key is an array of the elements responsible for generating
-   * the key. The `iterator` is bound to `thisArg` and invoked with three
+   * the key. The `iteratee` is bound to `thisArg` and invoked with three
    * arguments; (value, index|key, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -2858,10 +2907,10 @@
    * @memberOf _
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [iterator=identity] The function called
+   * @param {Function|Object|string} [iteratee=identity] The function called
    *  per iteration. If a property name or object is provided it is used to
    *  create a "_.pluck" or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Object} Returns the composed aggregate object.
    * @example
    *
@@ -2885,15 +2934,15 @@
 
   /**
    * Creates an object composed of keys generated from the results of running
-   * each element of the collection through `iterator`. The corresponding value
+   * each element of the collection through `iteratee`. The corresponding value
    * of each key is the last element responsible for generating the key. The
-   * iterator function is bound to `thisArg` and invoked with three arguments;
+   * iteratee function is bound to `thisArg` and invoked with three arguments;
    * (value, index|key, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -2901,10 +2950,10 @@
    * @memberOf _
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [iterator=identity] The function called
+   * @param {Function|Object|string} [iteratee=identity] The function called
    *  per iteration. If a property name or object is provided it is used to
    *  create a "_.pluck" or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Object} Returns the composed aggregate object.
    * @example
    *
@@ -2954,13 +3003,13 @@
 
   /**
    * Creates an array of values by running each element in the collection through
-   * `iterator`. The `iterator` is bound to `thisArg` and invoked with three
+   * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three
    * arguments; (value, index|key, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -2969,10 +3018,10 @@
    * @alias collect
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [iterator=identity] The function called
+   * @param {Function|Object|string} [iteratee=identity] The function called
    *  per iteration. If a property name or object is provided it is used to
    *  create a "_.pluck" or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Array} Returns the new mapped array.
    * @example
    *
@@ -2980,7 +3029,7 @@
    * // => [3, 6, 9]
    *
    * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; });
-   * // => [3, 6, 9] (property order is not guaranteed across environments)
+   * // => [3, 6, 9] (property order is not guaranteed)
    *
    * var characters = [
    *   { 'name': 'barney', 'age': 36 },
@@ -2991,24 +3040,24 @@
    * _.map(characters, 'name');
    * // => ['barney', 'fred']
    */
-  function map(collection, iterator, thisArg) {
-    iterator = baseCallback(iterator, thisArg, 3);
+  function map(collection, iteratee, thisArg) {
+    iteratee = baseCallback(iteratee, thisArg, 3);
 
     var func = isArray(collection) ? arrayMap : baseMap;
-    return func(collection, iterator);
+    return func(collection, iteratee);
   }
 
   /**
    * Retrieves the maximum value of `collection`. If the collection is empty
-   * or falsey `-Infinity` is returned. If an iterator function is provided it
+   * or falsey `-Infinity` is returned. If an iteratee function is provided it
    * is executed for each value in the collection to generate the criterion by
-   * which the value is ranked. The `iterator` is bound to `thisArg` and invoked
+   * which the value is ranked. The `iteratee` is bound to `thisArg` and invoked
    * with three arguments; (value, index, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -3016,10 +3065,10 @@
    * @memberOf _
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [iterator] The function called per iteration.
+   * @param {Function|Object|string} [iteratee] The function called per iteration.
    *  If a property name or object is provided it is used to create a "_.pluck"
    *  or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {*} Returns the maximum value.
    * @example
    *
@@ -3041,17 +3090,17 @@
    * _.max(characters, 'age');
    * // => { 'name': 'fred', 'age': 40 };
    */
-  function max(collection, iterator, thisArg) {
+  function max(collection, iteratee, thisArg) {
     var computed = -Infinity,
         result = computed,
-        type = typeof iterator;
+        type = typeof iteratee;
 
     // enables use as a callback for functions like `_.map`
-    if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === collection) {
-      iterator = null;
+    if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === collection) {
+      iteratee = null;
     }
 
-    if (iterator == null) {
+    if (iteratee == null) {
       var index = -1,
           iterable = toIterable(collection),
           length = iterable.length;
@@ -3063,10 +3112,10 @@
         }
       }
     } else {
-      iterator = baseCallback(iterator, thisArg, 3);
+      iteratee = baseCallback(iteratee, thisArg, 3);
 
       baseEach(collection, function(value, index, collection) {
-        var current = iterator(value, index, collection);
+        var current = iteratee(value, index, collection);
         if (current > computed || (current === -Infinity && current === result)) {
           computed = current;
           result = value;
@@ -3078,15 +3127,15 @@
 
   /**
    * Retrieves the minimum value of `collection`. If the collection is empty
-   * or falsey `Infinity` is returned. If an iterator function is provided it
+   * or falsey `Infinity` is returned. If an iteratee function is provided it
    * is executed for each value in the collection to generate the criterion by
-   * which the value is ranked. The `iterator` is bound to `thisArg` and invoked
+   * which the value is ranked. The `iteratee` is bound to `thisArg` and invoked
    * with three arguments; (value, index, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -3094,10 +3143,10 @@
    * @memberOf _
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function|Object|string} [iterator] The function called per iteration.
+   * @param {Function|Object|string} [iteratee] The function called per iteration.
    *  If a property name or object is provided it is used to create a "_.pluck"
    *  or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {*} Returns the minimum value.
    * @example
    *
@@ -3119,17 +3168,17 @@
    * _.min(characters, 'age');
    * // => { 'name': 'barney', 'age': 36 };
    */
-  function min(collection, iterator, thisArg) {
+  function min(collection, iteratee, thisArg) {
     var computed = Infinity,
         result = computed,
-        type = typeof iterator;
+        type = typeof iteratee;
 
     // enables use as a callback for functions like `_.map`
-    if ((type == 'number' || type == 'string') && thisArg && thisArg[iterator] === collection) {
-      iterator = null;
+    if ((type == 'number' || type == 'string') && thisArg && thisArg[iteratee] === collection) {
+      iteratee = null;
     }
 
-    if (iterator == null) {
+    if (iteratee == null) {
       var index = -1,
           iterable = toIterable(collection),
           length = iterable.length;
@@ -3141,10 +3190,10 @@
         }
       }
     } else {
-      iterator = baseCallback(iterator, thisArg, 3);
+      iteratee = baseCallback(iteratee, thisArg, 3);
 
       baseEach(collection, function(value, index, collection) {
-        var current = iterator(value, index, collection);
+        var current = iteratee(value, index, collection);
         if (current < computed || (current === Infinity && current === result)) {
           computed = current;
           result = value;
@@ -3227,10 +3276,10 @@
 
   /**
    * Reduces a collection to a value which is the accumulated result of running
-   * each element in the collection through `iterator`, where each successive
+   * each element in the collection through `iteratee`, where each successive
    * execution consumes the return value of the previous execution. If `accumulator`
    * is not provided the first element of the collection is used as the initial
-   * value. The `iterator` is bound to `thisArg`and invoked with four arguments;
+   * value. The `iteratee` is bound to `thisArg`and invoked with four arguments;
    * (accumulator, value, index|key, collection).
    *
    * @static
@@ -3238,9 +3287,9 @@
    * @alias foldl, inject
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} [iterator=identity] The function called per iteration.
+   * @param {Function} [iteratee=identity] The function called per iteration.
    * @param {*} [accumulator] The initial value.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {*} Returns the accumulated value.
    * @example
    *
@@ -3251,11 +3300,11 @@
    *   result[key] = n * 3;
    *   return result;
    * }, {});
-   * // => { 'a': 3, 'b': 6, 'c': 9 }
+   * // => { 'a': 3, 'b': 6, 'c': 9 } (property order is not guaranteed)
    */
-  function reduce(collection, iterator, accumulator, thisArg) {
+  function reduce(collection, iteratee, accumulator, thisArg) {
     var func = isArray(collection) ? arrayReduce : baseReduce;
-    return func(collection, baseCallback(iterator, thisArg, 4), accumulator, arguments.length < 3, baseEach);
+    return func(collection, baseCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEach);
   }
 
   /**
@@ -3267,9 +3316,9 @@
    * @alias foldr
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Function} [iterator=identity] The function called per iteration.
+   * @param {Function} [iteratee=identity] The function called per iteration.
    * @param {*} [accumulator] The initial value.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {*} Returns the accumulated value.
    * @example
    *
@@ -3277,9 +3326,9 @@
    * _.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []);
    * // => [4, 5, 2, 3, 0, 1]
    */
-  function reduceRight(collection, iterator, accumulator, thisArg) {
+  function reduceRight(collection, iteratee, accumulator, thisArg) {
     var func = isArray(collection) ? arrayReduceRight : baseReduce;
-    return func(collection, baseCallback(iterator, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
+    return func(collection, baseCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEachRight);
   }
 
   /**
@@ -3321,8 +3370,12 @@
    * // => [{ 'name': 'fred', 'age': 40, 'blocked': true }]
    */
   function reject(collection, predicate, thisArg) {
+    var func = isArray(collection) ? arrayFilter : baseFilter;
+
     predicate = baseCallback(predicate, thisArg, 3);
-    return filter(collection, negate(predicate));
+    return func(collection, function(value, index, collection) {
+      return !predicate(value, index, collection);
+    });
   }
 
   /**
@@ -3456,27 +3509,27 @@
    * // => false
    */
   function some(collection, predicate, thisArg) {
+    var func = isArray(collection) ? arraySome : baseSome;
     if (typeof predicate != 'function' || typeof thisArg != 'undefined') {
       predicate = baseCallback(predicate, thisArg, 3);
     }
-    var func = isArray(collection) ? arraySome : baseSome;
     return func(collection, predicate);
   }
 
   /**
    * Creates an array of elements, sorted in ascending order by the results of
-   * running each element in a collection through `iterator`. This method performs
+   * running each element in a collection through `iteratee`. This method performs
    * a stable sort, that is, it preserves the original sort order of equal elements.
-   * The `iterator` is bound to `thisArg` and invoked with three arguments;
+   * The `iteratee` is bound to `thisArg` and invoked with three arguments;
    * (value, index|key, collection).
    *
-   * If a property name is provided for `iterator` the created "_.pluck" style
+   * If a property name is provided for `iteratee` the created "_.pluck" style
    * callback returns the property value of the given element.
    *
-   * If an array of property names is provided for `iterator` the collection
+   * If an array of property names is provided for `iteratee` the collection
    * is sorted by each property value.
    *
-   * If an object is provided for `iterator` the created "_.where" style callback
+   * If an object is provided for `iteratee` the created "_.where" style callback
    * returns `true` for elements that have the properties of the given object,
    * else `false`.
    *
@@ -3484,10 +3537,10 @@
    * @memberOf _
    * @category Collection
    * @param {Array|Object|string} collection The collection to iterate over.
-   * @param {Array|Function|Object|string} [iterator=identity] The function
+   * @param {Array|Function|Object|string} [iteratee=identity] The function
    *  called per iteration. If property name(s) or an object is provided it
    *  is used to create a "_.pluck" or "_.where" style callback respectively.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Array} Returns the new sorted array.
    * @example
    *
@@ -3512,15 +3565,15 @@
    * _.map(_.sortBy(characters, ['name', 'age']), _.values);
    * // = > [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]]
    */
-  function sortBy(collection, iterator, thisArg) {
+  function sortBy(collection, iteratee, thisArg) {
     var index = -1,
         length = collection && collection.length,
         result = Array(length < 0 ? 0 : length >>> 0);
 
-    iterator = baseCallback(iterator, thisArg, 3);
+    iteratee = baseCallback(iteratee, thisArg, 3);
     baseEach(collection, function(value, key, collection) {
       result[++index] = {
-        'criteria': iterator(value, key, collection),
+        'criteria': iteratee(value, key, collection),
         'index': index,
         'value': value
       };
@@ -3550,7 +3603,7 @@
   function toArray(collection) {
     var length = collection ? collection.length : 0;
     if (typeof length == 'number' && length > -1 && length <= MAX_SAFE_INTEGER) {
-      return slice(collection);
+      return baseSlice(collection);
     }
     return values(collection);
   }
@@ -3658,7 +3711,7 @@
    * and prepends any additional `bind` arguments to those provided to the bound
    * function.
    *
-   * Note: Unlike native `Function#bind` this method does not set the `length`
+   * **Note:** Unlike native `Function#bind` this method does not set the `length`
    * property of bound functions.
    *
    * @static
@@ -3680,7 +3733,7 @@
    */
   function bind(func, thisArg) {
     return arguments.length < 3
-      ? createWrapper([func, BIND_FLAG, null, thisArg])
+      ? createWrapper(func, BIND_FLAG, null, thisArg)
       : basePartial(func, BIND_FLAG | PARTIAL_FLAG, slice(arguments, 2), [], thisArg);
   }
 
@@ -3690,7 +3743,7 @@
    * of method names. If no method names are provided all enumerable function
    * properties, own and inherited, of `object` are bound.
    *
-   * Note: This method does not set the `length` property of bound functions.
+   * **Note:** This method does not set the `length` property of bound functions.
    *
    * @static
    * @memberOf _
@@ -3780,7 +3833,7 @@
    * and/or trailing edge of the `wait` timeout. Subsequent calls to the
    * debounced function return the result of the last `func` call.
    *
-   * Note: If `leading` and `trailing` options are `true`, `func` is called on
+   * **Note:** If `leading` and `trailing` options are `true`, `func` is called on
    * the trailing edge of the timeout only if the the debounced function is
    * invoked more than once during the `wait` timeout.
    *
@@ -4046,34 +4099,6 @@
     };
   }
 
-  /**
-   * Creates a function that negates the result of the predicate `func`. The
-   * `func` function is executed with the `this` binding and arguments of the
-   * created function.
-   *
-   * @static
-   * @memberOf _
-   * @category Function
-   * @param {Function} predicate The predicate to negate.
-   * @returns {Function} Returns the new function.
-   * @example
-   *
-   * function isEven(n) {
-   *   return n % 2 == 0;
-   * }
-   *
-   * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
-   * // => [1, 3, 5]
-   */
-  function negate(predicate) {
-    if (!isFunction(predicate)) {
-      throw new TypeError(FUNC_ERROR_TEXT);
-    }
-    return function() {
-      return !predicate.apply(this, arguments);
-    };
-  }
-
   /**
    * Creates a function that is restricted to execute `func` once. Repeat calls
    * to the function return the value of the first call. The `func` is executed
@@ -4099,7 +4124,7 @@
    * prepended to those provided to the new function. This method is similar to
    * `_.bind` except it does **not** alter the `this` binding.
    *
-   * Note: This method does not set the `length` property of partially applied
+   * **Note:** This method does not set the `length` property of partially applied
    * functions.
    *
    * @static
@@ -4117,9 +4142,9 @@
    */
   function partial(func) {
     var args = slice(arguments, 1),
-        partialHolders = replaceHolders(args, partial.placeholder);
+        holders = replaceHolders(args, partial.placeholder);
 
-    return basePartial(func, PARTIAL_FLAG, args, partialHolders);
+    return basePartial(func, PARTIAL_FLAG, args, holders);
   }
 
   /**
@@ -4130,7 +4155,7 @@
    * Subsequent calls to the throttled function return the result of the last
    * `func` call.
    *
-   * Note: If `leading` and `trailing` options are `true`, `func` is called on
+   * **Note:** If `leading` and `trailing` options are `true`, `func` is called on
    * the trailing edge of the timeout only if the the throttled function is
    * invoked more than once during the `wait` timeout.
    *
@@ -4263,7 +4288,7 @@
    * cloning is handled by the method instead. The `customizer` is bound to
    * `thisArg` and invoked with two argument; (value, index|key).
    *
-   * Note: This method is loosely based on the structured clone algorithm. Functions
+   * **Note:** This method is loosely based on the structured clone algorithm. Functions
    * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
    * objects created by constructors other than `Object` are cloned to plain `Object` objects.
    * See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm)
@@ -4304,7 +4329,7 @@
    */
   function clone(value) {
     return isObject(value)
-      ? (isArray(value) ? slice(value) : assign({}, value))
+      ? (isArray(value) ? baseSlice(value) : assign({}, value))
       : value;
   }
 
@@ -4313,7 +4338,7 @@
    * object for all destination properties that resolve to `undefined`. Once a
    * property is set, additional defaults of the same property are ignored.
    *
-   * Note: See the [documentation example of `_.partialRight`](http://lodash.com/docs#partialRight)
+   * **Note:** See the [documentation example of `_.partialRight`](http://lodash.com/docs#partialRight)
    * for a deep version of this method.
    *
    * @static
@@ -4359,14 +4384,14 @@
    * @alias methods
    * @category Object
    * @param {Object} object The object to inspect.
-   * @returns {Array} Returns the new sorted array of property names.
+   * @returns {Array} Returns the new array of property names.
    * @example
    *
    * _.functions(_);
    * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
    */
   function functions(object) {
-    return baseFunctions(object, keysIn);
+    return baseFunctions(object, keysIn(object));
   }
 
   /**
@@ -4583,7 +4608,7 @@
    * instead. The `customizer` is bound to `thisArg` and invoked with three
    * arguments; (value, other, key).
    *
-   * Note: This method supports comparing arrays, booleans, `Date` objects,
+   * **Note:** This method supports comparing arrays, booleans, `Date` objects,
    * numbers, `Object` objects, regexes, and strings. Functions and DOM nodes
    * are **not** supported. Provide a customizer function to extend support
    * for comparing other values.
@@ -4643,7 +4668,7 @@
   /**
    * Checks if `value` is a finite primitive number.
    *
-   * Note: This method is based on ES6 `Number.isFinite`. See the
+   * **Note:** This method is based on ES6 `Number.isFinite`. See the
    * [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.isfinite)
    * for more details.
    *
@@ -4706,7 +4731,7 @@
    * Checks if `value` is the language type of `Object`.
    * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
    *
-   * Note: See the [ES5 spec](http://es5.github.io/#x8) for more details.
+   * **Note:** See the [ES5 spec](http://es5.github.io/#x8) for more details.
    *
    * @static
    * @memberOf _
@@ -4734,7 +4759,7 @@
   /**
    * Checks if `value` is `NaN`.
    *
-   * Note: This method is not the same as native `isNaN` which returns `true`
+   * **Note:** This method is not the same as native `isNaN` which returns `true`
    * for `undefined` and other non-numeric values. See the [ES5 spec](http://es5.github.io/#x15.1.2.4)
    * for more details.
    *
@@ -4763,6 +4788,27 @@
     return isNumber(value) && value != +value;
   }
 
+  /**
+   * Checks if `value` is a native function.
+   *
+   * @static
+   * @memberOf _
+   * @category Object
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+   */
+  function isNative(value) {
+    if (isFunction(value)) {
+      return reNative.test(fnToString.call(value));
+    }
+    if (value && typeof value == 'object') {
+      return !('constructor' in value) && isHostObject(value)
+        ? reNative.test(value)
+        : reHostCtor.test(toString.call(value));
+    }
+    return false;
+  }
+
   /**
    * Checks if `value` is `null`.
    *
@@ -4786,7 +4832,7 @@
   /**
    * Checks if `value` is classified as a `Number` primitive or object.
    *
-   * Note: To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
+   * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified
    * as numbers, use the `_.isFinite` method.
    *
    * @static
@@ -4890,7 +4936,7 @@
    * Shape.prototype.z = 0;
    *
    * _.keys(new Shape);
-   * // => ['x', 'y'] (property order is not guaranteed across environments)
+   * // => ['x', 'y'] (property order is not guaranteed)
    */
   var keys = !nativeKeys ? shimKeys : function(object) {
     return isObject(object) ? nativeKeys(object) : [];
@@ -4914,7 +4960,7 @@
    * Shape.prototype.z = 0;
    *
    * _.keysIn(new Shape);
-   * // => ['x', 'y', 'z'] (property order is not guaranteed across environments)
+   * // => ['x', 'y', 'z'] (property order is not guaranteed)
    */
   function keysIn(object) {
     var result = [];
@@ -4958,8 +5004,10 @@
     if (object == null) {
       return {};
     }
-    var omitProps = baseFlatten(arguments, false, false, 1);
-    return basePick(toObject(object), baseDifference(keysIn(object), arrayMap(omitProps, String)));
+    var iterable = toObject(object),
+        props = arrayMap(baseFlatten(arguments, false, false, 1), String);
+
+    return pickByArray(iterable, baseDifference(keysIn(iterable), props));
   }
 
   /**
@@ -4974,7 +5022,7 @@
    * @example
    *
    * _.pairs({ 'barney': 36, 'fred': 40 });
-   * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed across environments)
+   * // => [['barney', 36], ['fred', 40]] (property order is not guaranteed)
    */
   function pairs(object) {
     var index = -1,
@@ -5019,7 +5067,7 @@
   function pick(object) {
     return object == null
       ? {}
-      : basePick(toObject(object), baseFlatten(arguments, false, false, 1));
+      : pickByArray(toObject(object), baseFlatten(arguments, false, false, 1));
   }
 
   /**
@@ -5040,7 +5088,7 @@
    * Shape.prototype.z = 0;
    *
    * _.values(new Shape(2, 1));
-   * // => [2, 1] (property order is not guaranteed across environments)
+   * // => [2, 1] (property order is not guaranteed)
    */
   function values(object) {
     return baseValues(object, keys);
@@ -5052,7 +5100,7 @@
    * Converts the characters "&", "<", ">", '"', and "'" in `string` to
    * their corresponding HTML entities.
    *
-   * Note: No other characters are escaped. To escape additional characters
+   * **Note:** No other characters are escaped. To escape additional characters
    * use a third-party library like [_he_](http://mths.be/he).
    *
    * When working with HTML you should always quote attribute values to reduce
@@ -5105,7 +5153,7 @@
    * properties may be accessed as free variables in the template. If a setting
    * object is provided it overrides `_.templateSettings` for the template.
    *
-   * Note: In the development build `_.template` utilizes sourceURLs for easier debugging.
+   * **Note:** In the development build `_.template` utilizes sourceURLs for easier debugging.
    * See the [HTML5 Rocks article on sourcemaps](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
    * for more details.
    *
@@ -5252,7 +5300,7 @@
    * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to their
    * corresponding characters.
    *
-   * Note: No other HTML entities are unescaped. To unescape additional HTML
+   * **Note:** No other HTML entities are unescaped. To unescape additional HTML
    * entities use a third-party library like [_he_](http://mths.be/he).
    *
    * @static
@@ -5652,16 +5700,16 @@
   }
 
   /**
-   * Executes the iterator function `n` times, returning an array of the results
-   * of each execution. The `iterator` is bound to `thisArg` and invoked with
+   * Executes the iteratee function `n` times, returning an array of the results
+   * of each execution. The `iteratee` is bound to `thisArg` and invoked with
    * one argument; (index).
    *
    * @static
    * @memberOf _
    * @category Utility
-   * @param {number} n The number of times to execute `iterator`.
-   * @param {Function} [iterator=identity] The function called per iteration.
-   * @param {*} [thisArg] The `this` binding of `iterator`.
+   * @param {number} n The number of times to execute `iteratee`.
+   * @param {Function} [iteratee=identity] The function called per iteration.
+   * @param {*} [thisArg] The `this` binding of `iteratee`.
    * @returns {Array} Returns the array of results.
    * @example
    *
@@ -5674,18 +5722,18 @@
    * _.times(3, function(n) { this.cast(n); }, mage);
    * // => also calls `mage.castSpell(n)` three times
    */
-  function times(n, iterator, thisArg) {
+  function times(n, iteratee, thisArg) {
     n = nativeIsFinite(n = +n) && n > -1 ? n : 0;
-    iterator = baseCallback(iterator, thisArg, 1);
+    iteratee = baseCallback(iteratee, thisArg, 1);
 
     var index = -1,
         result = Array(nativeMin(n, MAX_ARRAY_LENGTH));
 
     while (++index < n) {
       if (index < MAX_ARRAY_LENGTH) {
-        result[index] = iterator(index);
+        result[index] = iteratee(index);
       } else {
-        iterator(index);
+        iteratee(index);
       }
     }
     return result;
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index e3771cecf..f0c9b9e3d 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -3,44 +3,43 @@
  * Lo-Dash 3.0.0-pre (Custom Build) lodash.com/license | Underscore.js 1.6.0 underscorejs.org/LICENSE
  * Build: `lodash underscore -o ./dist/lodash.underscore.js`
  */
-;(function(){function n(n,r,t){t=(t||0)-1;for(var e=n?n.length:0;++t<e;)if(n[t]===r)return t;return-1}function r(n,r){var t;n:{t=n.a;var e=r.a;if(t!==e){if(t>e||typeof t=="undefined"){t=1;break n}if(t<e||typeof e=="undefined"){t=-1;break n}}t=0}return t||n.b-r.b}function t(n){return rt[n]}function e(n){return"\\"+ut[n]}function u(n){return tt[n]}function o(n){return n instanceof o?n:new i(n)}function i(n,r){this.__chain__=!!r,this.__wrapped__=n}function f(n,r){for(var t=-1,e=n.length;++t<e&&r(n[t],t,n)!==Br;);return n
-}function a(n,r){for(var t=-1,e=n.length;++t<e;)if(!r(n[t],t,n))return false;return true}function c(n,r){for(var t=-1,e=n.length,u=Array(e);++t<e;)u[t]=r(n[t],t,n);return u}function l(n,r){for(var t=-1,e=n.length,u=[];++t<e;){var o=n[t];r(o,t,n)&&u.push(o)}return u}function p(n,r,t,e){var u=-1,o=n.length;for(e&&o&&(t=n[++u]);++u<o;)t=r(t,n[u],u,n);return t}function s(n,r,t,e){var u=n.length;for(e&&u&&(t=n[--u]);u--;)t=r(t,n[u],u,n);return t}function h(n,r){for(var t=-1,e=n.length;++t<e;)if(r(n[t],t,n))return true;
-return false}function g(n,r,t){var e=typeof n;if("function"==e){if(typeof r=="undefined")return n;switch(t){case 1:return function(t){return n.call(r,t)};case 3:return function(t,e,u){return n.call(r,t,e,u)};case 4:return function(t,e,u,o){return n.call(r,t,e,u,o)};case 5:return function(t,e,u,o,i){return n.call(r,t,e,u,o,i)}}return function(){return n.apply(r,arguments)}}return null==n?Tr:"object"==e?Er(n):kr(n)}function v(n){return br(n)?wt(n):{}}function y(n){function r(){for(var n=arguments.length,t=n,n=Array(n);t--;)n[t]=arguments[t];
-if(i){for(var t=n,n=e.length,c=-1,l=Et(t.length-n,0),p=-1,s=i.length,h=Array(l+s);++p<s;)h[p]=i[p];for(;++c<n;)h[e[c]]=t[c];for(;l--;)h[p++]=t[c++];n=h}return(this instanceof r?a||R(u):u).apply(f?o:this,n)}var t=n[1];if(t==Ir)return N(n);var e=n[5];if((t==Mr||t==(Ir|Mr))&&!e.length)return U(n);var u=n[0],o=n[3],i=n[4],f=t&Ir,a=!(t&Fr)&&R(u);return r}function m(n,r){var t=n?n.length:0;if(!t)return[];for(var e=-1,u=D(),o=[];++e<t;){var i=n[e];0>u(r,i)&&o.push(i)}return o}function b(n,r){var t=n?n.length:0;
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