diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 5bf4849d7..7291ff07d 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -158,7 +158,7 @@
    */
   function basicIndexOf(array, value, fromIndex) {
     var index = (fromIndex || 0) - 1,
-        length = array.length;
+        length = array ? array.length : 0;
 
     while (++index < length) {
       if (array[index] === value) {
@@ -235,7 +235,7 @@
   }
 
   /**
-   * Used by `sortBy` to compare transformed `collection` values, stable sorting
+   * Used by `sortBy` to compare transformed `collection` elements, stable sorting
    * them in ascending order.
    *
    * @private
@@ -957,24 +957,22 @@
      *
      * @private
      * @param {Array} array The array to flatten.
-     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
-     * @param {Function} [callback] The function called per iteration.
+     * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
+     * @param {Boolean} [isArgArrays=false] A flag to restrict flattening to arrays and `arguments` objects.
+     * @param {Number} [fromIndex=0] The index to start from.
      * @returns {Array} Returns a new flattened array.
      */
-    function basicFlatten(array, isShallow, callback) {
-      var index = -1,
+    function basicFlatten(array, isShallow, isArgArrays, fromIndex) {
+      var index = (fromIndex || 0) - 1,
           length = array ? array.length : 0,
           result = [];
 
       while (++index < length) {
         var value = array[index];
-        if (callback) {
-          value = callback(value, index, array);
-        }
         // recursively flatten arrays (susceptible to call stack limits)
         if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
           push.apply(result, isShallow ? value : basicFlatten(value));
-        } else {
+        } else if (!isArgArrays) {
           result.push(value);
         }
       }
@@ -1156,7 +1154,7 @@
     }
     // fallback for browsers without `Object.create`
     if (!nativeCreate) {
-      var createObject = function(prototype) {
+      createObject = function(prototype) {
         if (isObject(prototype)) {
           noop.prototype = prototype;
           var result = new noop;
@@ -1185,34 +1183,11 @@
      * @private
      * @returns {Function} Returns the "indexOf" function.
      */
-    function getIndexOf(array, value, fromIndex) {
+    function getIndexOf() {
       var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;
       return result;
     }
 
-    /**
-     * Creates a function that juggles arguments, allowing argument overloading
-     * for `_.flatten` and `_.uniq`, before passing them to the given `func`.
-     *
-     * @private
-     * @param {Function} func The function to wrap.
-     * @returns {Function} Returns the new function.
-     */
-    function overloadWrapper(func) {
-      return function(array, flag, callback, thisArg) {
-        // juggle arguments
-        if (typeof flag != 'boolean' && flag != null) {
-          thisArg = callback;
-          callback = !(thisArg && thisArg[flag] === array) ? flag : undefined;
-          flag = false;
-        }
-        if (callback != null) {
-          callback = lodash.createCallback(callback, thisArg);
-        }
-        return func(array, flag, callback, thisArg);
-      };
-    }
-
     /**
      * A fallback implementation of `isPlainObject` which checks if a given `value`
      * is an object created by the `Object` constructor, assuming objects created
@@ -1723,8 +1698,8 @@
     var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions);
 
     /**
-     * Creates a sorted array of all enumerable properties, own and inherited,
-     * of `object` that have function values.
+     * Creates a sorted array of property names of all enumerable properties,
+     * own and inherited, of `object` that have function values.
      *
      * @static
      * @memberOf _
@@ -2497,7 +2472,7 @@
       if (isFunc) {
         callback = lodash.createCallback(callback, thisArg);
       } else {
-        var props = basicFlatten(nativeSlice.call(arguments, 1));
+        var props = basicFlatten(arguments, true, false, 1);
       }
       forIn(object, function(value, key, object) {
         if (isFunc
@@ -2567,7 +2542,7 @@
       var result = {};
       if (typeof callback != 'function') {
         var index = -1,
-            props = basicFlatten(nativeSlice.call(arguments, 1)),
+            props = basicFlatten(arguments, true, false, 1),
             length = isObject(object) ? props.length : 0;
 
         while (++index < length) {
@@ -2688,7 +2663,7 @@
      */
     function at(collection) {
       var index = -1,
-          props = basicFlatten(nativeSlice.call(arguments, 1)),
+          props = basicFlatten(arguments, true, false, 1),
           length = props.length,
           result = Array(length);
 
@@ -3693,7 +3668,7 @@
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to compact.
-     * @returns {Array} Returns a new filtered array.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.compact([0, 1, false, 2, '', 3]);
@@ -3714,17 +3689,15 @@
     }
 
     /**
-     * Creates an arrat with all occurrences of the passed values removed using
-     * using strict equality for comparisons, i.e. `===`. Values to exclude may
-     * be specified as individual arguments or as arrays.
+     * Creates an array excluding all values of the passed-in arrays using
+     * strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to process.
-     * @param {Array} [array1, array2, ...] The values to exclude, specified as
-     *  individual values or arrays of values.
-     * @returns {Array} Returns a new filtered array.
+     * @param {Array} [array1, array2, ...] The arrays of values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
@@ -3734,7 +3707,7 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
-          seen = basicFlatten(nativeSlice.call(arguments, 1)),
+          seen = basicFlatten(arguments, true, true, 1),
           result = [];
 
       var isLarge = length >= largeArraySize && indexOf === basicIndexOf;
@@ -3889,7 +3862,7 @@
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to flatten.
-     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
+     * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
      * @param {Function|Object|String} [callback=identity] The function called per
      *  iteration. If a property name or object is passed, it will be used to create
      *  a "_.pluck" or "_.where" style callback, respectively.
@@ -3912,7 +3885,18 @@
      * _.flatten(stooges, 'quotes');
      * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
      */
-    var flatten = overloadWrapper(basicFlatten);
+    function flatten(array, isShallow, callback, thisArg) {
+      // juggle arguments
+      if (typeof isShallow != 'boolean' && isShallow != null) {
+        thisArg = callback;
+        callback = !(thisArg && thisArg[isShallow] === array) ? isShallow : undefined;
+        isShallow = false;
+      }
+      if (callback != null) {
+        array = map(array, callback, thisArg);
+      }
+      return basicFlatten(array, isShallow);
+    }
 
     /**
      * Gets the index at which the first occurrence of `value` is found using
@@ -4025,15 +4009,14 @@
     }
 
     /**
-     * Computes the intersection of all the passed-in arrays using strict equality
-     * for comparisons, i.e. `===`.
+     * Creates an array of unique values present in all passed-in arrays using
+     * strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
-     * @param {Array} [array1, array2, ...] Arrays to process.
-     * @returns {Array} Returns a new array of unique elements that are present
-     *  in **all** of the arrays.
+     * @param {Array} [array1, array2, ...] The arrays to inspect.
+     * @returns {Array} Returns an array of composite values.
      * @example
      *
      * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
@@ -4384,22 +4367,21 @@
     }
 
     /**
-     * Computes the union of the passed-in arrays using strict equality for
-     * comparisons, i.e. `===`.
+     * Creates an array of unique values, in order, of the passed-in arrays
+     * using strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
-     * @param {Array} [array1, array2, ...] Arrays to process.
-     * @returns {Array} Returns a new array of unique values, in order, that are
-     *  present in one or more of the arrays.
+     * @param {Array} [array1, array2, ...] The arrays to inspect.
+     * @returns {Array} Returns an array of composite values.
      * @example
      *
      * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
      * // => [1, 2, 3, 101, 10]
      */
     function union(array) {
-      return basicUniq(basicFlatten(compact(arguments), true));
+      return basicUniq(basicFlatten(arguments, true, true));
     }
 
     /**
@@ -4445,18 +4427,29 @@
      * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
-    var uniq = overloadWrapper(basicUniq);
+    function uniq(array, isSorted, callback, thisArg) {
+      // juggle arguments
+      if (typeof isSorted != 'boolean' && isSorted != null) {
+        thisArg = callback;
+        callback = !(thisArg && thisArg[isSorted] === array) ? isSorted : undefined;
+        isSorted = false;
+      }
+      if (callback != null) {
+        callback = lodash.createCallback(callback, thisArg);
+      }
+      return basicUniq(array, isSorted, callback);
+    }
 
     /**
-     * Creates an array excluding all occurrences of the passed values using
-     * strict equality for comparisons, i.e. `===`.
+     * Creates an array excluding all passed values using strict equality for
+     * comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to filter.
-     * @param {Mixed} [value1, value2, ...] Values to exclude.
-     * @returns {Array} Returns a new filtered array.
+     * @param {Mixed} [value1, value2, ...] The values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
@@ -4598,7 +4591,7 @@
      * @category Functions
      * @param {Object} object The object to bind and assign the bound methods to.
      * @param {String} [methodName1, methodName2, ...] The object method names to
-     *  bind, specified as individual values or arrays of values.
+     *  bind, specified as individual method names or arrays of method names.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -4612,7 +4605,7 @@
      * // => alerts 'clicked docs', when the button is clicked
      */
     function bindAll(object) {
-      var funcs = arguments.length > 1 ? basicFlatten(nativeSlice.call(arguments, 1)) : functions(object),
+      var funcs = arguments.length > 1 ? basicFlatten(arguments, true, false, 1) : functions(object),
           index = -1,
           length = funcs.length;
 
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index adc01aed1..6477a81bd 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -3,48 +3,49 @@
  * Lo-Dash 1.3.1 (Custom Build) lodash.com/license | Underscore.js 1.5.1 underscorejs.org/LICENSE
  * Build: `lodash -o ./dist/lodash.compat.js`
  */
-;!function(n){function t(n,t,r){r=(r||0)-1;for(var e=n.length;++r<e;)if(n[r]===t)return r;return-1}function r(n,r){var e=typeof r;if(n=n.k,"boolean"==e||r==d)return n[r];"number"!=e&&"string"!=e&&(e="object");var u="number"==e?r:O+r;return n=n[e]||(n[e]={}),"object"==e?n[u]&&-1<t(n[u],r)?0:-1:n[u]?0:-1}function e(n){var t=this.k,r=typeof n;if("boolean"==r||n==d)t[n]=y;else{"number"!=r&&"string"!=r&&(r="object");var e="number"==r?n:O+n,t=t[r]||(t[r]={});"object"==r?(t[e]||(t[e]=[])).push(n):t[e]=y}}function u(n){return n.charCodeAt(0)
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diff --git a/dist/lodash.js b/dist/lodash.js
index 473dac71a..c4c3ad25a 100644
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   function basicIndexOf(array, value, fromIndex) {
     var index = (fromIndex || 0) - 1,
-        length = array.length;
+        length = array ? array.length : 0;
 
     while (++index < length) {
       if (array[index] === value) {
@@ -228,7 +228,7 @@
   }
 
   /**
-   * Used by `sortBy` to compare transformed `collection` values, stable sorting
+   * Used by `sortBy` to compare transformed `collection` elements, stable sorting
    * them in ascending order.
    *
    * @private
@@ -662,24 +662,22 @@
      *
      * @private
      * @param {Array} array The array to flatten.
-     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
-     * @param {Function} [callback] The function called per iteration.
+     * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
+     * @param {Boolean} [isArgArrays=false] A flag to restrict flattening to arrays and `arguments` objects.
+     * @param {Number} [fromIndex=0] The index to start from.
      * @returns {Array} Returns a new flattened array.
      */
-    function basicFlatten(array, isShallow, callback) {
-      var index = -1,
+    function basicFlatten(array, isShallow, isArgArrays, fromIndex) {
+      var index = (fromIndex || 0) - 1,
           length = array ? array.length : 0,
           result = [];
 
       while (++index < length) {
         var value = array[index];
-        if (callback) {
-          value = callback(value, index, array);
-        }
         // recursively flatten arrays (susceptible to call stack limits)
         if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
           push.apply(result, isShallow ? value : basicFlatten(value));
-        } else {
+        } else if (!isArgArrays) {
           result.push(value);
         }
       }
@@ -826,34 +824,11 @@
      * @private
      * @returns {Function} Returns the "indexOf" function.
      */
-    function getIndexOf(array, value, fromIndex) {
+    function getIndexOf() {
       var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;
       return result;
     }
 
-    /**
-     * Creates a function that juggles arguments, allowing argument overloading
-     * for `_.flatten` and `_.uniq`, before passing them to the given `func`.
-     *
-     * @private
-     * @param {Function} func The function to wrap.
-     * @returns {Function} Returns the new function.
-     */
-    function overloadWrapper(func) {
-      return function(array, flag, callback, thisArg) {
-        // juggle arguments
-        if (typeof flag != 'boolean' && flag != null) {
-          thisArg = callback;
-          callback = !(thisArg && thisArg[flag] === array) ? flag : undefined;
-          flag = false;
-        }
-        if (callback != null) {
-          callback = lodash.createCallback(callback, thisArg);
-        }
-        return func(array, flag, callback, thisArg);
-      };
-    }
-
     /**
      * A fallback implementation of `isPlainObject` which checks if a given `value`
      * is an object created by the `Object` constructor, assuming objects created
@@ -1384,8 +1359,8 @@
     };
 
     /**
-     * Creates a sorted array of all enumerable properties, own and inherited,
-     * of `object` that have function values.
+     * Creates a sorted array of property names of all enumerable properties,
+     * own and inherited, of `object` that have function values.
      *
      * @static
      * @memberOf _
@@ -2151,7 +2126,7 @@
       if (isFunc) {
         callback = lodash.createCallback(callback, thisArg);
       } else {
-        var props = basicFlatten(nativeSlice.call(arguments, 1));
+        var props = basicFlatten(arguments, true, false, 1);
       }
       forIn(object, function(value, key, object) {
         if (isFunc
@@ -2221,7 +2196,7 @@
       var result = {};
       if (typeof callback != 'function') {
         var index = -1,
-            props = basicFlatten(nativeSlice.call(arguments, 1)),
+            props = basicFlatten(arguments, true, false, 1),
             length = isObject(object) ? props.length : 0;
 
         while (++index < length) {
@@ -2342,7 +2317,7 @@
      */
     function at(collection) {
       var index = -1,
-          props = basicFlatten(nativeSlice.call(arguments, 1)),
+          props = basicFlatten(arguments, true, false, 1),
           length = props.length,
           result = Array(length);
 
@@ -3354,7 +3329,7 @@
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to compact.
-     * @returns {Array} Returns a new filtered array.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.compact([0, 1, false, 2, '', 3]);
@@ -3375,17 +3350,15 @@
     }
 
     /**
-     * Creates an arrat with all occurrences of the passed values removed using
-     * using strict equality for comparisons, i.e. `===`. Values to exclude may
-     * be specified as individual arguments or as arrays.
+     * Creates an array excluding all values of the passed-in arrays using
+     * strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to process.
-     * @param {Array} [array1, array2, ...] The values to exclude, specified as
-     *  individual values or arrays of values.
-     * @returns {Array} Returns a new filtered array.
+     * @param {Array} [array1, array2, ...] The arrays of values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
@@ -3395,7 +3368,7 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
-          seen = basicFlatten(nativeSlice.call(arguments, 1)),
+          seen = basicFlatten(arguments, true, true, 1),
           result = [];
 
       var isLarge = length >= largeArraySize && indexOf === basicIndexOf;
@@ -3550,7 +3523,7 @@
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to flatten.
-     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
+     * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
      * @param {Function|Object|String} [callback=identity] The function called per
      *  iteration. If a property name or object is passed, it will be used to create
      *  a "_.pluck" or "_.where" style callback, respectively.
@@ -3573,7 +3546,18 @@
      * _.flatten(stooges, 'quotes');
      * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
      */
-    var flatten = overloadWrapper(basicFlatten);
+    function flatten(array, isShallow, callback, thisArg) {
+      // juggle arguments
+      if (typeof isShallow != 'boolean' && isShallow != null) {
+        thisArg = callback;
+        callback = !(thisArg && thisArg[isShallow] === array) ? isShallow : undefined;
+        isShallow = false;
+      }
+      if (callback != null) {
+        array = map(array, callback, thisArg);
+      }
+      return basicFlatten(array, isShallow);
+    }
 
     /**
      * Gets the index at which the first occurrence of `value` is found using
@@ -3686,15 +3670,14 @@
     }
 
     /**
-     * Computes the intersection of all the passed-in arrays using strict equality
-     * for comparisons, i.e. `===`.
+     * Creates an array of unique values present in all passed-in arrays using
+     * strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
-     * @param {Array} [array1, array2, ...] Arrays to process.
-     * @returns {Array} Returns a new array of unique elements that are present
-     *  in **all** of the arrays.
+     * @param {Array} [array1, array2, ...] The arrays to inspect.
+     * @returns {Array} Returns an array of composite values.
      * @example
      *
      * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
@@ -4045,22 +4028,21 @@
     }
 
     /**
-     * Computes the union of the passed-in arrays using strict equality for
-     * comparisons, i.e. `===`.
+     * Creates an array of unique values, in order, of the passed-in arrays
+     * using strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
-     * @param {Array} [array1, array2, ...] Arrays to process.
-     * @returns {Array} Returns a new array of unique values, in order, that are
-     *  present in one or more of the arrays.
+     * @param {Array} [array1, array2, ...] The arrays to inspect.
+     * @returns {Array} Returns an array of composite values.
      * @example
      *
      * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
      * // => [1, 2, 3, 101, 10]
      */
     function union(array) {
-      return basicUniq(basicFlatten(compact(arguments), true));
+      return basicUniq(basicFlatten(arguments, true, true));
     }
 
     /**
@@ -4106,18 +4088,29 @@
      * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
-    var uniq = overloadWrapper(basicUniq);
+    function uniq(array, isSorted, callback, thisArg) {
+      // juggle arguments
+      if (typeof isSorted != 'boolean' && isSorted != null) {
+        thisArg = callback;
+        callback = !(thisArg && thisArg[isSorted] === array) ? isSorted : undefined;
+        isSorted = false;
+      }
+      if (callback != null) {
+        callback = lodash.createCallback(callback, thisArg);
+      }
+      return basicUniq(array, isSorted, callback);
+    }
 
     /**
-     * Creates an array excluding all occurrences of the passed values using
-     * strict equality for comparisons, i.e. `===`.
+     * Creates an array excluding all passed values using strict equality for
+     * comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to filter.
-     * @param {Mixed} [value1, value2, ...] Values to exclude.
-     * @returns {Array} Returns a new filtered array.
+     * @param {Mixed} [value1, value2, ...] The values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
@@ -4259,7 +4252,7 @@
      * @category Functions
      * @param {Object} object The object to bind and assign the bound methods to.
      * @param {String} [methodName1, methodName2, ...] The object method names to
-     *  bind, specified as individual values or arrays of values.
+     *  bind, specified as individual method names or arrays of method names.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -4273,7 +4266,7 @@
      * // => alerts 'clicked docs', when the button is clicked
      */
     function bindAll(object) {
-      var funcs = arguments.length > 1 ? basicFlatten(nativeSlice.call(arguments, 1)) : functions(object),
+      var funcs = arguments.length > 1 ? basicFlatten(arguments, true, false, 1) : functions(object),
           index = -1,
           length = funcs.length;
 
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index d41a93d5a..94c67e24b 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
@@ -3,45 +3,45 @@
  * Lo-Dash 1.3.1 (Custom Build) lodash.com/license | Underscore.js 1.5.1 underscorejs.org/LICENSE
  * Build: `lodash modern -o ./dist/lodash.js`
  */
-;!function(n){function t(n,t,e){e=(e||0)-1;for(var r=n.length;++e<r;)if(n[e]===t)return e;return-1}function e(n,e){var r=typeof e;if(n=n.k,"boolean"==r||e==y)return n[e];"number"!=r&&"string"!=r&&(r="object");var u="number"==r?e:w+e;return n=n[r]||(n[r]={}),"object"==r?n[u]&&-1<t(n[u],e)?0:-1:n[u]?0:-1}function r(n){var t=this.k,e=typeof n;if("boolean"==e||n==y)t[n]=h;else{"number"!=e&&"string"!=e&&(e="object");var r="number"==e?n:w+n,t=t[e]||(t[e]={});"object"==e?(t[r]||(t[r]=[])).push(n):t[r]=h}}function u(n){return n.charCodeAt(0)
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+return t=nt.createCallback(t,r,4),e==h&&(u?e=[]:(r=n&&n.constructor,e=yt(r&&r.prototype)?he(r&&r.prototype):{})),(u?Ct:d)(n,function(n,r,u){return t(e,n,r,u)}),e},nt.union=function(){return rt(et(arguments,y,y))},nt.uniq=Tt,nt.values=dt,nt.where=jt,nt.without=function(n){return Nt(n,xe.call(arguments,1))},nt.wrap=function(n,t){return function(){var e=[n];return pe.apply(e,arguments),t.apply(this,e)}},nt.zip=Dt,nt.zipObject=qt,nt.collect=xt,nt.drop=Ft,nt.each=Ct,nt.extend=Q,nt.methods=pt,nt.object=qt,nt.select=jt,nt.tail=Ft,nt.unique=Tt,nt.unzip=Dt,Mt(nt),nt.chain=nt,nt.prototype.chain=function(){return this
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+return gt(e)?n[t]():e},nt.runInContext=v,nt.size=function(n){var t=n?n.length:0;return typeof t=="number"?t:Ae(n).length},nt.some=It,nt.sortedIndex=Rt,nt.template=function(n,t,e){var r=nt.templateSettings;n||(n=""),e=L({},e,r);var u,a=L({},e.imports,r.imports),r=Ae(a),a=dt(a),o=0,f=e.interpolate||F,c="__p+='",f=Yt((e.escape||F).source+"|"+f.source+"|"+(f===$?I:F).source+"|"+(e.evaluate||F).source+"|$","g");n.replace(f,function(t,e,r,a,f,l){return r||(r=a),c+=n.slice(o,l).replace(T,i),e&&(c+="'+__e("+e+")+'"),f&&(u=y,c+="';"+f+";__p+='"),r&&(c+="'+((__t=("+r+"))==null?'':__t)+'"),o=l+t.length,t
+}),c+="';\n",f=e=e.variable,f||(e="obj",c="with("+e+"){"+c+"}"),c=(u?c.replace(E,""):c).replace(S,"$1").replace(A,"$1;"),c="function("+e+"){"+(f?"":e+"||("+e+"={});")+"var __t,__p='',__e=_.escape"+(u?",__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}":";")+c+"return __p}";try{var l=Jt(r,"return "+c).apply(g,a)}catch(p){throw p.source=c,p}return t?l(t):(l.source=c,l)},nt.unescape=function(n){return n==h?"":Zt(n).replace($e,ft)},nt.uniqueId=function(n){var t=++_;return Zt(n==h?"":n)+t
+},nt.all=kt,nt.any=It,nt.detect=wt,nt.findWhere=wt,nt.foldl=St,nt.foldr=At,nt.include=_t,nt.inject=St,d(nt,function(n,t){nt.prototype[t]||(nt.prototype[t]=function(){var t=[this.__wrapped__];return pe.apply(t,arguments),n.apply(nt,t)})}),nt.first=$t,nt.last=function(n,t,e){if(n){var r=0,u=n.length;if(typeof t!="number"&&t!=h){var a=u;for(t=nt.createCallback(t,e);a--&&t(n[a],a,n);)r++}else if(r=t,r==h||e)return n[u-1];return s(n,ke(0,u-r))}},nt.take=$t,nt.head=$t,d(nt,function(n,t){nt.prototype[t]||(nt.prototype[t]=function(t,e){var r=n(this.__wrapped__,t,e);
+return t==h||e&&typeof t!="function"?r:new tt(r)})}),nt.VERSION="1.3.1",nt.prototype.toString=function(){return Zt(this.__wrapped__)},nt.prototype.value=Ut,nt.prototype.valueOf=Ut,Ct(["join","pop","shift"],function(n){var t=te[n];nt.prototype[n]=function(){return t.apply(this.__wrapped__,arguments)}}),Ct(["push","reverse","sort","unshift"],function(n){var t=te[n];nt.prototype[n]=function(){return t.apply(this.__wrapped__,arguments),this}}),Ct(["concat","slice","splice"],function(n){var t=te[n];nt.prototype[n]=function(){return new tt(t.apply(this.__wrapped__,arguments))
+}}),nt}var g,y=!0,h=null,b=!1,m=[],d=[],_=0,k={},j={},w=+new Date+"",C=75,x=40,O=" \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",E=/\b__p\+='';/g,S=/\b(__p\+=)''\+/g,A=/(__e\(.*?\)|\b__t\))\+'';/g,I=/\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g,N=/\w*$/,$=/<%=([\s\S]+?)%>/g,B=RegExp("^["+O+"]*0+(?=.$)"),F=/($^)/,R=(R=/\bthis\b/)&&R.test(v)&&R,T=/['\n\r\t\u2028\u2029\\]/g,D="Array Boolean Date Function Math Number Object RegExp String _ attachEvent clearTimeout isFinite isNaN parseInt setImmediate setTimeout".split(" "),q="[object Arguments]",z="[object Array]",W="[object Boolean]",P="[object Date]",K="[object Function]",M="[object Number]",U="[object Object]",V="[object RegExp]",G="[object String]",H={};
+H[K]=b,H[q]=H[z]=H[W]=H[P]=H[M]=H[U]=H[V]=H[G]=y;var J={"boolean":b,"function":y,object:y,number:b,string:b,undefined:b},L={"\\":"\\","'":"'","\n":"n","\r":"r","\t":"t","\u2028":"u2028","\u2029":"u2029"},Q=J[typeof exports]&&exports,X=J[typeof module]&&module&&module.exports==Q&&module,Y=J[typeof global]&&global;!Y||Y.global!==Y&&Y.window!==Y||(n=Y);var Z=v();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(n._=Z, define(function(){return Z})):Q&&!Q.nodeType?X?(X.exports=Z)._=Z:Q._=Z:n._=Z
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\ No newline at end of file
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 68ff46864..192e1f664 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -91,7 +91,7 @@
    */
   function basicIndexOf(array, value, fromIndex) {
     var index = (fromIndex || 0) - 1,
-        length = array.length;
+        length = array ? array.length : 0;
 
     while (++index < length) {
       if (array[index] === value) {
@@ -102,7 +102,7 @@
   }
 
   /**
-   * Used by `sortBy` to compare transformed `collection` values, stable sorting
+   * Used by `sortBy` to compare transformed `collection` elements, stable sorting
    * them in ascending order.
    *
    * @private
@@ -360,6 +360,68 @@
 
   /*--------------------------------------------------------------------------*/
 
+  /**
+   * A basic implementation of `_.flatten` without support for `callback`
+   * shorthands or `thisArg` binding.
+   *
+   * @private
+   * @param {Array} array The array to flatten.
+   * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
+   * @param {Boolean} [isArgArrays=false] A flag to restrict flattening to arrays and `arguments` objects.
+   * @param {Number} [fromIndex=0] The index to start from.
+   * @returns {Array} Returns a new flattened array.
+   */
+  function basicFlatten(array, isShallow, isArgArrays, fromIndex) {
+    var index = (fromIndex || 0) - 1,
+        length = array ? array.length : 0,
+        result = [];
+
+    while (++index < length) {
+      var value = array[index];
+      // recursively flatten arrays (susceptible to call stack limits)
+      if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
+        push.apply(result, isShallow ? value : basicFlatten(value));
+      } else if (!isArgArrays) {
+        result.push(value);
+      }
+    }
+    return result;
+  }
+
+  /**
+   * A basic implementation of `_.uniq` without support for `callback` shorthands
+   * or `thisArg` binding.
+   *
+   * @private
+   * @param {Array} array The array to process.
+   * @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.
+   * @param {Function} [callback] The function called per iteration.
+   * @returns {Array} Returns a duplicate-value-free array.
+   */
+  function basicUniq(array, isSorted, callback) {
+    var index = -1,
+        indexOf = getIndexOf(),
+        length = array ? array.length : 0,
+        result = [],
+        seen = callback ? [] : result;
+
+    while (++index < length) {
+      var value = array[index],
+          computed = callback ? callback(value, index, array) : value;
+
+      if (isSorted
+            ? !index || seen[seen.length - 1] !== computed
+            : indexOf(seen, computed) < 0
+          ) {
+        if (callback) {
+          seen.push(computed);
+        }
+        result.push(value);
+      }
+    }
+    return result;
+  }
+
   /**
    * Creates a function that, when called, invokes `func` with the `this` binding
    * of `thisArg` and prepends any `partialArgs` to the arguments passed to the
@@ -430,7 +492,7 @@
   }
   // fallback for browsers without `Object.create`
   if (!nativeCreate) {
-    var createObject = function(prototype) {
+    createObject = function(prototype) {
       if (isObject(prototype)) {
         noop.prototype = prototype;
         var result = new noop;
@@ -459,7 +521,7 @@
    * @private
    * @returns {Function} Returns the "indexOf" function.
    */
-  function getIndexOf(array, value, fromIndex) {
+  function getIndexOf() {
     var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;
     return result;
   }
@@ -793,8 +855,8 @@
   };
 
   /**
-   * Creates a sorted array of all enumerable properties, own and inherited,
-   * of `object` that have function values.
+   * Creates a sorted array of property names of all enumerable properties,
+   * own and inherited, of `object` that have function values.
    *
    * @static
    * @memberOf _
@@ -2445,7 +2507,7 @@
    * @memberOf _
    * @category Arrays
    * @param {Array} array The array to compact.
-   * @returns {Array} Returns a new filtered array.
+   * @returns {Array} Returns a new array of filtered values.
    * @example
    *
    * _.compact([0, 1, false, 2, '', 3]);
@@ -2466,17 +2528,15 @@
   }
 
   /**
-   * Creates an arrat with all occurrences of the passed values removed using
-   * using strict equality for comparisons, i.e. `===`. Values to exclude may
-   * be specified as individual arguments or as arrays.
+   * Creates an array excluding all values of the passed-in arrays using
+   * strict equality for comparisons, i.e. `===`.
    *
    * @static
    * @memberOf _
    * @category Arrays
    * @param {Array} array The array to process.
-   * @param {Array} [array1, array2, ...] The values to exclude, specified as
-   *  individual values or arrays of values.
-   * @returns {Array} Returns a new filtered array.
+   * @param {Array} [array1, array2, ...] The arrays of values to exclude.
+   * @returns {Array} Returns a new array of filtered values.
    * @example
    *
    * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
@@ -2594,7 +2654,7 @@
    * @memberOf _
    * @category Arrays
    * @param {Array} array The array to flatten.
-   * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
+   * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
    * @param {Function|Object|String} [callback=identity] The function called per
    *  iteration. If a property name or object is passed, it will be used to create
    *  a "_.pluck" or "_.where" style callback, respectively.
@@ -2618,19 +2678,7 @@
    * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
    */
   function flatten(array, isShallow) {
-    var index = -1,
-        length = array ? array.length : 0,
-        result = [];
-
-    while (++index < length) {
-      var value = array[index];
-      if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
-        push.apply(result, isShallow ? value : flatten(value));
-      } else {
-        result.push(value);
-      }
-    }
-    return result;
+    return basicFlatten(array, isShallow);
   }
 
   /**
@@ -2744,15 +2792,14 @@
   }
 
   /**
-   * Computes the intersection of all the passed-in arrays using strict equality
-   * for comparisons, i.e. `===`.
+   * Creates an array of unique values present in all passed-in arrays using
+   * strict equality for comparisons, i.e. `===`.
    *
    * @static
    * @memberOf _
    * @category Arrays
-   * @param {Array} [array1, array2, ...] Arrays to process.
-   * @returns {Array} Returns a new array of unique elements that are present
-   *  in **all** of the arrays.
+   * @param {Array} [array1, array2, ...] The arrays to inspect.
+   * @returns {Array} Returns an array of composite values.
    * @example
    *
    * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
@@ -3082,22 +3129,21 @@
   }
 
   /**
-   * Computes the union of the passed-in arrays using strict equality for
-   * comparisons, i.e. `===`.
+   * Creates an array of unique values, in order, of the passed-in arrays
+   * using strict equality for comparisons, i.e. `===`.
    *
    * @static
    * @memberOf _
    * @category Arrays
-   * @param {Array} [array1, array2, ...] Arrays to process.
-   * @returns {Array} Returns a new array of unique values, in order, that are
-   *  present in one or more of the arrays.
+   * @param {Array} [array1, array2, ...] The arrays to inspect.
+   * @returns {Array} Returns an array of composite values.
    * @example
    *
    * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
    * // => [1, 2, 3, 101, 10]
    */
   function union(array) {
-    return uniq(flatten(compact(arguments), true));
+    return basicUniq(basicFlatten(arguments, true, true));
   }
 
   /**
@@ -3144,48 +3190,28 @@
    * // => [{ 'x': 1 }, { 'x': 2 }]
    */
   function uniq(array, isSorted, callback, thisArg) {
-    var index = -1,
-        indexOf = getIndexOf(),
-        length = array ? array.length : 0,
-        result = [],
-        seen = result;
-
+    // juggle arguments
     if (typeof isSorted != 'boolean' && isSorted != null) {
       thisArg = callback;
-      callback = isSorted;
+      callback = !(thisArg && thisArg[isSorted] === array) ? isSorted : undefined;
       isSorted = false;
     }
     if (callback != null) {
-      seen = [];
       callback = createCallback(callback, thisArg);
     }
-    while (++index < length) {
-      var value = array[index],
-          computed = callback ? callback(value, index, array) : value;
-
-      if (isSorted
-            ? !index || seen[seen.length - 1] !== computed
-            : indexOf(seen, computed) < 0
-          ) {
-        if (callback) {
-          seen.push(computed);
-        }
-        result.push(value);
-      }
-    }
-    return result;
+    return basicUniq(array, isSorted, callback);
   }
 
   /**
-   * Creates an array excluding all occurrences of the passed values using
-   * strict equality for comparisons, i.e. `===`.
+   * Creates an array excluding all passed values using strict equality for
+   * comparisons, i.e. `===`.
    *
    * @static
    * @memberOf _
    * @category Arrays
    * @param {Array} array The array to filter.
-   * @param {Mixed} [value1, value2, ...] Values to exclude.
-   * @returns {Array} Returns a new filtered array.
+   * @param {Mixed} [value1, value2, ...] The values to exclude.
+   * @returns {Array} Returns a new array of filtered values.
    * @example
    *
    * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
@@ -3326,7 +3352,7 @@
    * @category Functions
    * @param {Object} object The object to bind and assign the bound methods to.
    * @param {String} [methodName1, methodName2, ...] The object method names to
-   *  bind, specified as individual values or arrays of values.
+   *  bind, specified as individual method names or arrays of method names.
    * @returns {Object} Returns `object`.
    * @example
    *
@@ -3340,7 +3366,7 @@
    * // => alerts 'clicked docs', when the button is clicked
    */
   function bindAll(object) {
-    var funcs = arguments.length > 1 ? flatten(nativeSlice.call(arguments, 1)) : functions(object),
+    var funcs = arguments.length > 1 ? basicFlatten(arguments, true, false, 1) : functions(object),
         index = -1,
         length = funcs.length;
 
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index cc0376098..03ad0d792 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -3,34 +3,34 @@
  * Lo-Dash 1.3.1 (Custom Build) lodash.com/license | Underscore.js 1.5.1 underscorejs.org/LICENSE
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  */
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+return N(n,function(n){o[++e]=(u?t:n[t]).apply(n,r)}),o},i.keys=Wt,i.map=R,i.max=B,i.memoize=function(n,t){var r={};return function(){var e=nt+(t?t.apply(this,arguments):arguments[0]);return wt.call(r,e)?r[e]:r[e]=n.apply(this,arguments)}},i.min=function(n,t,r){var e=1/0,u=e,i=-1,o=n?n.length:0;if(t||typeof o!="number")t=J(t,r),N(n,function(n,r,i){r=t(n,r,i),r<e&&(e=r,u=n)});else for(;++i<o;)r=n[i],r<u&&(u=r);return u},i.omit=function(n){var t=s(),r=W(Dt.call(arguments,1)),e={};return Gt(n,function(n,u){0>t(r,u)&&(e[u]=n)
+}),e},i.once=function(n){var t,r;return function(){return t?r:(t=!0,r=n.apply(this,arguments),n=null,r)}},i.pairs=function(n){for(var t=-1,r=Wt(n),e=r.length,u=Array(e);++t<e;){var i=r[t];u[t]=[i,n[i]]}return u},i.partial=function(n){return l(n,Dt.call(arguments,1))},i.pick=function(n){for(var t=-1,r=W(Dt.call(arguments,1)),e=r.length,u={};++t<e;){var i=r[t];i in n&&(u[i]=n[i])}return u},i.pluck=k,i.range=function(n,t,r){n=+n||0,r=+r||1,null==t&&(t=n,n=0);var e=-1;t=Rt(0,bt((t-n)/r));for(var u=Array(t);++e<t;)u[e]=n,n+=r;
+return u},i.reject=function(n,t,r){return t=J(t,r),S(n,function(n,r,e){return!t(n,r,e)})},i.rest=P,i.shuffle=function(n){var t=-1,r=n?n.length:0,e=Array(typeof r=="number"?r:0);return N(n,function(n){var r=jt(kt()*(++t+1));e[t]=e[r],e[r]=n}),e},i.sortBy=function(n,t,e){var u=-1,i=n?n.length:0,o=Array(typeof i=="number"?i:0);for(t=J(t,e),N(n,function(n,r,e){o[++u]={l:t(n,r,e),m:u,n:n}}),i=o.length,o.sort(r);i--;)o[i]=o[i].n;return o},i.tap=function(n,t){return t(n),n},i.throttle=function(n,t,r){var e=!0,u=!0;
+return false===r?e=!1:w(r)&&(e="leading"in r?r.leading:e,u="trailing"in r?r.trailing:u),r={},r.leading=e,r.maxWait=t,r.trailing=u,K(n,t,r)},i.times=function(n,t,r){for(var e=-1,u=Array(-1<n?n:0);++e<n;)u[e]=t.call(r,e);return u},i.toArray=function(n){return zt(n)?Dt.call(n):n&&typeof n.length=="number"?R(n):O(n)},i.union=function(){return f(a(arguments,!0,!0))},i.uniq=V,i.values=O,i.where=$,i.without=function(n){return z(n,Dt.call(arguments,1))},i.wrap=function(n,t){return function(){var r=[n];return xt.apply(r,arguments),t.apply(this,r)
+}},i.zip=G,i.collect=R,i.drop=P,i.each=N,i.extend=h,i.methods=m,i.object=function(n,t){for(var r=-1,e=n?n.length:0,u={};++r<e;){var i=n[r];t?u[i]=t[r]:u[i[0]]=i[1]}return u},i.select=S,i.tail=P,i.unique=V,i.unzip=G,i.chain=function(n){return n=new o(n),n.__chain__=!0,n},i.clone=function(n){return w(n)?zt(n)?Dt.call(n):h({},n):n},i.contains=E,i.escape=function(n){return null==n?"":(n+"").replace(Vt,p)},i.every=T,i.find=F,i.has=function(n,t){return n?wt.call(n,t):!1},i.identity=L,i.indexOf=C,i.isArguments=g,i.isArray=zt,i.isBoolean=function(n){return true===n||false===n||At.call(n)==it
+},i.isDate=function(n){return n?typeof n=="object"&&At.call(n)==ot:!1},i.isElement=function(n){return n?1===n.nodeType:!1},i.isEmpty=d,i.isEqual=b,i.isFinite=function(n){return St(n)&&!Ft(parseFloat(n))},i.isFunction=j,i.isNaN=function(n){return x(n)&&n!=+n},i.isNull=function(n){return null===n},i.isNumber=x,i.isObject=w,i.isRegExp=function(n){return n&&pt[typeof n]?At.call(n)==lt:!1},i.isString=A,i.isUndefined=function(n){return typeof n=="undefined"},i.lastIndexOf=function(n,t,r){var e=n?n.length:0;
+for(typeof r=="number"&&(e=(0>r?Rt(0,e+r):Bt(r,e-1))+1);e--;)if(n[e]===t)return e;return-1},i.mixin=Q,i.noConflict=function(){return n._=_t,this},i.random=function(n,t){null==n&&null==t&&(t=1),n=+n||0,null==t?(t=n,n=0):t=+t||0;var r=kt();return n%1||t%1?n+Bt(r*(t-n+parseFloat("1e-"+((r+"").length-1))),t):n+jt(r*(t-n+1))},i.reduce=D,i.reduceRight=q,i.result=function(n,t){var r=n?n[t]:X;return j(r)?n[t]():r},i.size=function(n){var t=n?n.length:0;return typeof t=="number"?t:Wt(n).length},i.some=M,i.sortedIndex=U,i.template=function(n,t,r){var u=i.templateSettings;
+n||(n=""),r=y({},r,u);var o=0,a="__p+='",u=r.variable;n.replace(RegExp((r.escape||tt).source+"|"+(r.interpolate||tt).source+"|"+(r.evaluate||tt).source+"|$","g"),function(t,r,u,i,f){return a+=n.slice(o,f).replace(rt,e),r&&(a+="'+_['escape']("+r+")+'"),i&&(a+="';"+i+";__p+='"),u&&(a+="'+((__t=("+u+"))==null?'':__t)+'"),o=f+t.length,t}),a+="';\n",u||(u="obj",a="with("+u+"||{}){"+a+"}"),a="function("+u+"){var __t,__p='',__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}"+a+"return __p}";
+try{var f=Function("_","return "+a)(i)}catch(l){throw l.source=a,l}return t?f(t):(f.source=a,f)},i.unescape=function(n){return null==n?"":(n+"").replace(Ut,v)},i.uniqueId=function(n){var t=++Y+"";return n?n+t:t},i.all=T,i.any=M,i.detect=F,i.findWhere=function(n,t){return $(n,t,!0)},i.foldl=D,i.foldr=q,i.include=E,i.inject=D,i.first=I,i.last=function(n,t,r){if(n){var e=0,u=n.length;if(typeof t!="number"&&null!=t){var i=u;for(t=J(t,r);i--&&t(n[i],i,n);)e++}else if(e=t,null==e||r)return n[u-1];return Dt.call(n,Rt(0,u-e))
+}},i.take=I,i.head=I,i.VERSION="1.3.1",Q(i),i.prototype.chain=function(){return this.__chain__=!0,this},i.prototype.value=function(){return this.__wrapped__},N("pop push reverse shift sort splice unshift".split(" "),function(n){var t=yt[n];i.prototype[n]=function(){var n=this.__wrapped__;return t.apply(n,arguments),!$t.spliceObjects&&0===n.length&&delete n[0],this}}),N(["concat","join","slice"],function(n){var t=yt[n];i.prototype[n]=function(){var n=t.apply(this.__wrapped__,arguments);return this.__chain__&&(n=new o(n),n.__chain__=!0),n
+}}),typeof define=="function"&&typeof define.amd=="object"&&define.amd?(n._=i, define(function(){return i})):vt&&!vt.nodeType?gt?(gt.exports=i)._=i:vt._=i:n._=i}(this);
\ No newline at end of file
diff --git a/lodash.js b/lodash.js
index f3b190ee2..23050dc4a 100644
--- a/lodash.js
+++ b/lodash.js
@@ -234,7 +234,7 @@
   }
 
   /**
-   * Used by `sortBy` to compare transformed `collection` values, stable sorting
+   * Used by `sortBy` to compare transformed `collection` elements, stable sorting
    * them in ascending order.
    *
    * @private
@@ -974,24 +974,22 @@
      *
      * @private
      * @param {Array} array The array to flatten.
-     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
-     * @param {Function} [callback] The function called per iteration.
+     * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
+     * @param {Boolean} [isArgArrays=false] A flag to restrict flattening to arrays and `arguments` objects.
+     * @param {Number} [fromIndex=0] The index to start from.
      * @returns {Array} Returns a new flattened array.
      */
-    function basicFlatten(array, isShallow, callback) {
-      var index = -1,
+    function basicFlatten(array, isShallow, isArgArrays, fromIndex) {
+      var index = (fromIndex || 0) - 1,
           length = array ? array.length : 0,
           result = [];
 
       while (++index < length) {
         var value = array[index];
-        if (callback) {
-          value = callback(value, index, array);
-        }
         // recursively flatten arrays (susceptible to call stack limits)
         if (value && typeof value == 'object' && (isArray(value) || isArguments(value))) {
           push.apply(result, isShallow ? value : basicFlatten(value));
-        } else {
+        } else if (!isArgArrays) {
           result.push(value);
         }
       }
@@ -1175,7 +1173,7 @@
     }
     // fallback for browsers without `Object.create`
     if (!nativeCreate) {
-      var createObject = function(prototype) {
+      createObject = function(prototype) {
         if (isObject(prototype)) {
           noop.prototype = prototype;
           var result = new noop;
@@ -1204,34 +1202,11 @@
      * @private
      * @returns {Function} Returns the "indexOf" function.
      */
-    function getIndexOf(array, value, fromIndex) {
+    function getIndexOf() {
       var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;
       return result;
     }
 
-    /**
-     * Creates a function that juggles arguments, allowing argument overloading
-     * for `_.flatten` and `_.uniq`, before passing them to the given `func`.
-     *
-     * @private
-     * @param {Function} func The function to wrap.
-     * @returns {Function} Returns the new function.
-     */
-    function overloadWrapper(func) {
-      return function(array, flag, callback, thisArg) {
-        // juggle arguments
-        if (typeof flag != 'boolean' && flag != null) {
-          thisArg = callback;
-          callback = !(thisArg && thisArg[flag] === array) ? flag : undefined;
-          flag = false;
-        }
-        if (callback != null) {
-          callback = lodash.createCallback(callback, thisArg);
-        }
-        return func(array, flag, callback, thisArg);
-      };
-    }
-
     /**
      * A fallback implementation of `isPlainObject` which checks if a given `value`
      * is an object created by the `Object` constructor, assuming objects created
@@ -1742,8 +1717,8 @@
     var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions);
 
     /**
-     * Creates a sorted array of all enumerable properties, own and inherited,
-     * of `object` that have function values.
+     * Creates a sorted array of property names of all enumerable properties,
+     * own and inherited, of `object` that have function values.
      *
      * @static
      * @memberOf _
@@ -2516,7 +2491,7 @@
       if (isFunc) {
         callback = lodash.createCallback(callback, thisArg);
       } else {
-        var props = basicFlatten(nativeSlice.call(arguments, 1));
+        var props = basicFlatten(arguments, true, false, 1);
       }
       forIn(object, function(value, key, object) {
         if (isFunc
@@ -2586,7 +2561,7 @@
       var result = {};
       if (typeof callback != 'function') {
         var index = -1,
-            props = basicFlatten(nativeSlice.call(arguments, 1)),
+            props = basicFlatten(arguments, true, false, 1),
             length = isObject(object) ? props.length : 0;
 
         while (++index < length) {
@@ -2707,7 +2682,7 @@
      */
     function at(collection) {
       var index = -1,
-          props = basicFlatten(nativeSlice.call(arguments, 1)),
+          props = basicFlatten(arguments, true, false, 1),
           length = props.length,
           result = Array(length);
 
@@ -3712,7 +3687,7 @@
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to compact.
-     * @returns {Array} Returns a new filtered array.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.compact([0, 1, false, 2, '', 3]);
@@ -3733,17 +3708,15 @@
     }
 
     /**
-     * Creates an arrat with all occurrences of the passed values removed using
-     * using strict equality for comparisons, i.e. `===`. Values to exclude may
-     * be specified as individual arguments or as arrays.
+     * Creates an array excluding all values of the passed-in arrays using
+     * strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to process.
-     * @param {Array} [array1, array2, ...] The values to exclude, specified as
-     *  individual values or arrays of values.
-     * @returns {Array} Returns a new filtered array.
+     * @param {Array} [array1, array2, ...] The arrays of values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
@@ -3753,7 +3726,7 @@
       var index = -1,
           indexOf = getIndexOf(),
           length = array ? array.length : 0,
-          seen = basicFlatten(nativeSlice.call(arguments, 1)),
+          seen = basicFlatten(arguments, true, true, 1),
           result = [];
 
       var isLarge = length >= largeArraySize && indexOf === basicIndexOf;
@@ -3908,7 +3881,7 @@
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to flatten.
-     * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
+     * @param {Boolean} [isShallow=false] A flag to restrict flattening to a single level.
      * @param {Function|Object|String} [callback=identity] The function called per
      *  iteration. If a property name or object is passed, it will be used to create
      *  a "_.pluck" or "_.where" style callback, respectively.
@@ -3931,7 +3904,18 @@
      * _.flatten(stooges, 'quotes');
      * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
      */
-    var flatten = overloadWrapper(basicFlatten);
+    function flatten(array, isShallow, callback, thisArg) {
+      // juggle arguments
+      if (typeof isShallow != 'boolean' && isShallow != null) {
+        thisArg = callback;
+        callback = !(thisArg && thisArg[isShallow] === array) ? isShallow : undefined;
+        isShallow = false;
+      }
+      if (callback != null) {
+        array = map(array, callback, thisArg);
+      }
+      return basicFlatten(array, isShallow);
+    }
 
     /**
      * Gets the index at which the first occurrence of `value` is found using
@@ -4044,15 +4028,14 @@
     }
 
     /**
-     * Computes the intersection of all the passed-in arrays using strict equality
-     * for comparisons, i.e. `===`.
+     * Creates an array of unique values present in all passed-in arrays using
+     * strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
-     * @param {Array} [array1, array2, ...] Arrays to process.
-     * @returns {Array} Returns a new array of unique elements that are present
-     *  in **all** of the arrays.
+     * @param {Array} [array1, array2, ...] The arrays to inspect.
+     * @returns {Array} Returns an array of composite values.
      * @example
      *
      * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
@@ -4403,22 +4386,21 @@
     }
 
     /**
-     * Computes the union of the passed-in arrays using strict equality for
-     * comparisons, i.e. `===`.
+     * Creates an array of unique values, in order, of the passed-in arrays
+     * using strict equality for comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
-     * @param {Array} [array1, array2, ...] Arrays to process.
-     * @returns {Array} Returns a new array of unique values, in order, that are
-     *  present in one or more of the arrays.
+     * @param {Array} [array1, array2, ...] The arrays to inspect.
+     * @returns {Array} Returns an array of composite values.
      * @example
      *
      * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
      * // => [1, 2, 3, 101, 10]
      */
     function union(array) {
-      return basicUniq(basicFlatten(compact(arguments), true));
+      return basicUniq(basicFlatten(arguments, true, true));
     }
 
     /**
@@ -4464,18 +4446,29 @@
      * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
      * // => [{ 'x': 1 }, { 'x': 2 }]
      */
-    var uniq = overloadWrapper(basicUniq);
+    function uniq(array, isSorted, callback, thisArg) {
+      // juggle arguments
+      if (typeof isSorted != 'boolean' && isSorted != null) {
+        thisArg = callback;
+        callback = !(thisArg && thisArg[isSorted] === array) ? isSorted : undefined;
+        isSorted = false;
+      }
+      if (callback != null) {
+        callback = lodash.createCallback(callback, thisArg);
+      }
+      return basicUniq(array, isSorted, callback);
+    }
 
     /**
-     * Creates an array excluding all occurrences of the passed values using
-     * strict equality for comparisons, i.e. `===`.
+     * Creates an array excluding all passed values using strict equality for
+     * comparisons, i.e. `===`.
      *
      * @static
      * @memberOf _
      * @category Arrays
      * @param {Array} array The array to filter.
-     * @param {Mixed} [value1, value2, ...] Values to exclude.
-     * @returns {Array} Returns a new filtered array.
+     * @param {Mixed} [value1, value2, ...] The values to exclude.
+     * @returns {Array} Returns a new array of filtered values.
      * @example
      *
      * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
@@ -4617,7 +4610,7 @@
      * @category Functions
      * @param {Object} object The object to bind and assign the bound methods to.
      * @param {String} [methodName1, methodName2, ...] The object method names to
-     *  bind, specified as individual values or arrays of values.
+     *  bind, specified as individual method names or arrays of method names.
      * @returns {Object} Returns `object`.
      * @example
      *
@@ -4631,7 +4624,7 @@
      * // => alerts 'clicked docs', when the button is clicked
      */
     function bindAll(object) {
-      var funcs = arguments.length > 1 ? basicFlatten(nativeSlice.call(arguments, 1)) : functions(object),
+      var funcs = arguments.length > 1 ? basicFlatten(arguments, true, false, 1) : functions(object),
           index = -1,
           length = funcs.length;