Bump to v4.14.2.

README.md

@@ -1,4 +1,4 @@
-# lodash v4.11.2
+# lodash v4.14.2
 
 The [Lodash](https://lodash.com/) library exported as [Node.js](https://nodejs.org/) modules.
 
@@ -28,13 +28,13 @@ var chunk = require('lodash/chunk');
 var extend = require('lodash/fp/extend');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.11.2-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.14.2-npm) for more details.
 
 **Note:**<br>
-Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` when in the REPL.<br>
+Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` in the Node.js < 6 REPL.<br>
 Install [n_](https://www.npmjs.com/package/n_) for a REPL that includes `lodash` by default.
 
 ## Support
 
-Tested in Chrome 48-49, Firefox 44-45, IE 9-11, Edge 13, Safari 8-9, Node.js 0.10, 0.12, 4, & 5, & PhantomJS 1.9.8.<br>
+Tested in Chrome 51-52, Firefox 47-48, IE 9-11, Edge 14, Safari 8-9, Node.js 0.10-6, & PhantomJS 2.1.1.<br>
 Automated [browser](https://saucelabs.com/u/lodash) & [CI](https://travis-ci.org/lodash/lodash/) test runs are available.

_Hash.js

@@ -1,18 +1,32 @@
-var nativeCreate = require('./_nativeCreate');
-
-/** Used for built-in method references. */
-var objectProto = Object.prototype;
+var hashClear = require('./_hashClear'),
+    hashDelete = require('./_hashDelete'),
+    hashGet = require('./_hashGet'),
+    hashHas = require('./_hashHas'),
+    hashSet = require('./_hashSet');
 
 /**
  * Creates a hash object.
  *
  * @private
  * @constructor
- * @returns {Object} Returns the new hash object.
+ * @param {Array} [entries] The key-value pairs to cache.
  */
-function Hash() {}
+function Hash(entries) {
+  var index = -1,
+      length = entries ? entries.length : 0;
 
-// Avoid inheriting from `Object.prototype` when possible.
-Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
+  this.clear();
+  while (++index < length) {
+    var entry = entries[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+// Add methods to `Hash`.
+Hash.prototype.clear = hashClear;
+Hash.prototype['delete'] = hashDelete;
+Hash.prototype.get = hashGet;
+Hash.prototype.has = hashHas;
+Hash.prototype.set = hashSet;
 
 module.exports = Hash;

_ListCache.js

@@ -0,0 +1,32 @@
+var listCacheClear = require('./_listCacheClear'),
+    listCacheDelete = require('./_listCacheDelete'),
+    listCacheGet = require('./_listCacheGet'),
+    listCacheHas = require('./_listCacheHas'),
+    listCacheSet = require('./_listCacheSet');
+
+/**
+ * Creates an list cache object.
+ *
+ * @private
+ * @constructor
+ * @param {Array} [entries] The key-value pairs to cache.
+ */
+function ListCache(entries) {
+  var index = -1,
+      length = entries ? entries.length : 0;
+
+  this.clear();
+  while (++index < length) {
+    var entry = entries[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+// Add methods to `ListCache`.
+ListCache.prototype.clear = listCacheClear;
+ListCache.prototype['delete'] = listCacheDelete;
+ListCache.prototype.get = listCacheGet;
+ListCache.prototype.has = listCacheHas;
+ListCache.prototype.set = listCacheSet;
+
+module.exports = ListCache;

_MapCache.js

@@ -1,32 +1,32 @@
-var mapClear = require('./_mapClear'),
-    mapDelete = require('./_mapDelete'),
-    mapGet = require('./_mapGet'),
-    mapHas = require('./_mapHas'),
-    mapSet = require('./_mapSet');
+var mapCacheClear = require('./_mapCacheClear'),
+    mapCacheDelete = require('./_mapCacheDelete'),
+    mapCacheGet = require('./_mapCacheGet'),
+    mapCacheHas = require('./_mapCacheHas'),
+    mapCacheSet = require('./_mapCacheSet');
 
 /**
  * Creates a map cache object to store key-value pairs.
  *
  * @private
  * @constructor
- * @param {Array} [values] The values to cache.
+ * @param {Array} [entries] The key-value pairs to cache.
  */
-function MapCache(values) {
+function MapCache(entries) {
   var index = -1,
-      length = values ? values.length : 0;
+      length = entries ? entries.length : 0;
 
   this.clear();
   while (++index < length) {
-    var entry = values[index];
+    var entry = entries[index];
     this.set(entry[0], entry[1]);
   }
 }
 
 // Add methods to `MapCache`.
-MapCache.prototype.clear = mapClear;
-MapCache.prototype['delete'] = mapDelete;
-MapCache.prototype.get = mapGet;
-MapCache.prototype.has = mapHas;
-MapCache.prototype.set = mapSet;
+MapCache.prototype.clear = mapCacheClear;
+MapCache.prototype['delete'] = mapCacheDelete;
+MapCache.prototype.get = mapCacheGet;
+MapCache.prototype.has = mapCacheHas;
+MapCache.prototype.set = mapCacheSet;
 
 module.exports = MapCache;

_Reflect.js

@@ -1,6 +0,0 @@
-var root = require('./_root');
-
-/** Built-in value references. */
-var Reflect = root.Reflect;
-
-module.exports = Reflect;

_SetCache.js

@@ -1,9 +1,10 @@
 var MapCache = require('./_MapCache'),
-    cachePush = require('./_cachePush');
+    setCacheAdd = require('./_setCacheAdd'),
+    setCacheHas = require('./_setCacheHas');
 
 /**
  *
- * Creates a set cache object to store unique values.
+ * Creates an array cache object to store unique values.
  *
  * @private
  * @constructor
@@ -15,11 +16,12 @@ function SetCache(values) {
 
   this.__data__ = new MapCache;
   while (++index < length) {
-    this.push(values[index]);
+    this.add(values[index]);
   }
 }
 
 // Add methods to `SetCache`.
-SetCache.prototype.push = cachePush;
+SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
+SetCache.prototype.has = setCacheHas;
 
 module.exports = SetCache;

_Stack.js

@@ -1,4 +1,5 @@
-var stackClear = require('./_stackClear'),
+var ListCache = require('./_ListCache'),
+    stackClear = require('./_stackClear'),
     stackDelete = require('./_stackDelete'),
     stackGet = require('./_stackGet'),
     stackHas = require('./_stackHas'),
@@ -9,17 +10,10 @@ var stackClear = require('./_stackClear'),
  *
  * @private
  * @constructor
- * @param {Array} [values] The values to cache.
+ * @param {Array} [entries] The key-value pairs to cache.
  */
-function Stack(values) {
-  var index = -1,
-      length = values ? values.length : 0;
-
-  this.clear();
-  while (++index < length) {
-    var entry = values[index];
-    this.set(entry[0], entry[1]);
-  }
+function Stack(entries) {
+  this.__data__ = new ListCache(entries);
 }
 
 // Add methods to `Stack`.

_addMapEntry.js

@@ -7,7 +7,7 @@
  * @returns {Object} Returns `map`.
  */
 function addMapEntry(map, pair) {
-  // Don't return `Map#set` because it doesn't return the map instance in IE 11.
+  // Don't return `map.set` because it's not chainable in IE 11.
   map.set(pair[0], pair[1]);
   return map;
 }

_addSetEntry.js

@@ -7,6 +7,7 @@
  * @returns {Object} Returns `set`.
  */
 function addSetEntry(set, value) {
+  // Don't return `set.add` because it's not chainable in IE 11.
   set.add(value);
   return set;
 }

_apply.js

@@ -9,8 +9,7 @@
  * @returns {*} Returns the result of `func`.
  */
 function apply(func, thisArg, args) {
-  var length = args.length;
-  switch (length) {
+  switch (args.length) {
     case 0: return func.call(thisArg);
     case 1: return func.call(thisArg, args[0]);
     case 2: return func.call(thisArg, args[0], args[1]);

_arrayAggregator.js

@@ -2,7 +2,7 @@
  * A specialized version of `baseAggregator` for arrays.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} setter The function to set `accumulator` values.
  * @param {Function} iteratee The iteratee to transform keys.
  * @param {Object} accumulator The initial aggregated object.
@@ -10,7 +10,7 @@
  */
 function arrayAggregator(array, setter, iteratee, accumulator) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     var value = array[index];

_arrayConcat.js

@@ -1,25 +0,0 @@
-/**
- * Creates a new array concatenating `array` with `other`.
- *
- * @private
- * @param {Array} array The first array to concatenate.
- * @param {Array} other The second array to concatenate.
- * @returns {Array} Returns the new concatenated array.
- */
-function arrayConcat(array, other) {
-  var index = -1,
-      length = array.length,
-      othIndex = -1,
-      othLength = other.length,
-      result = Array(length + othLength);
-
-  while (++index < length) {
-    result[index] = array[index];
-  }
-  while (++othIndex < othLength) {
-    result[index++] = other[othIndex];
-  }
-  return result;
-}
-
-module.exports = arrayConcat;

_arrayEach.js

@@ -3,13 +3,13 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns `array`.
  */
 function arrayEach(array, iteratee) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (iteratee(array[index], index, array) === false) {

_arrayEachRight.js

@@ -3,12 +3,12 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns `array`.
  */
 function arrayEachRight(array, iteratee) {
-  var length = array.length;
+  var length = array ? array.length : 0;
 
   while (length--) {
     if (iteratee(array[length], length, array) === false) {

_arrayEvery.js

@@ -3,14 +3,14 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} predicate The function invoked per iteration.
  * @returns {boolean} Returns `true` if all elements pass the predicate check,
  *  else `false`.
  */
 function arrayEvery(array, predicate) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (!predicate(array[index], index, array)) {

_arrayFilter.js

@@ -3,13 +3,13 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} predicate The function invoked per iteration.
  * @returns {Array} Returns the new filtered array.
  */
 function arrayFilter(array, predicate) {
   var index = -1,
-      length = array.length,
+      length = array ? array.length : 0,
       resIndex = 0,
       result = [];
 

_arrayIncludes.js

@@ -5,12 +5,13 @@ var baseIndexOf = require('./_baseIndexOf');
  * specifying an index to search from.
  *
  * @private
- * @param {Array} array The array to search.
+ * @param {Array} [array] The array to search.
  * @param {*} target The value to search for.
  * @returns {boolean} Returns `true` if `target` is found, else `false`.
  */
 function arrayIncludes(array, value) {
-  return !!array.length && baseIndexOf(array, value, 0) > -1;
+  var length = array ? array.length : 0;
+  return !!length && baseIndexOf(array, value, 0) > -1;
 }
 
 module.exports = arrayIncludes;

_arrayIncludesWith.js

@@ -2,14 +2,14 @@
  * This function is like `arrayIncludes` except that it accepts a comparator.
  *
  * @private
- * @param {Array} array The array to search.
+ * @param {Array} [array] The array to search.
  * @param {*} target The value to search for.
  * @param {Function} comparator The comparator invoked per element.
  * @returns {boolean} Returns `true` if `target` is found, else `false`.
  */
 function arrayIncludesWith(array, value, comparator) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (comparator(value, array[index])) {

_arrayLikeKeys.js

@@ -0,0 +1,38 @@
+var baseTimes = require('./_baseTimes'),
+    isArguments = require('./isArguments'),
+    isArray = require('./isArray'),
+    isIndex = require('./_isIndex'),
+    isString = require('./isString');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Creates an array of the enumerable property names of the array-like `value`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @param {boolean} inherited Specify returning inherited property names.
+ * @returns {Array} Returns the array of property names.
+ */
+function arrayLikeKeys(value, inherited) {
+  var result = (isArray(value) || isString(value) || isArguments(value))
+    ? baseTimes(value.length, String)
+    : [];
+
+  var length = result.length,
+      skipIndexes = !!length;
+
+  for (var key in value) {
+    if ((inherited || hasOwnProperty.call(value, key)) &&
+        !(skipIndexes && (key == 'length' || isIndex(key, length)))) {
+      result.push(key);
+    }
+  }
+  return result;
+}
+
+module.exports = arrayLikeKeys;

_arrayMap.js

@@ -3,13 +3,13 @@
  * shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @returns {Array} Returns the new mapped array.
  */
 function arrayMap(array, iteratee) {
   var index = -1,
-      length = array.length,
+      length = array ? array.length : 0,
       result = Array(length);
 
   while (++index < length) {

_arrayReduce.js

@@ -3,7 +3,7 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
  * @param {boolean} [initAccum] Specify using the first element of `array` as
@@ -12,7 +12,7 @@
  */
 function arrayReduce(array, iteratee, accumulator, initAccum) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   if (initAccum && length) {
     accumulator = array[++index];

_arrayReduceRight.js

@@ -3,7 +3,7 @@
  * iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
  * @param {boolean} [initAccum] Specify using the last element of `array` as
@@ -11,7 +11,7 @@
  * @returns {*} Returns the accumulated value.
  */
 function arrayReduceRight(array, iteratee, accumulator, initAccum) {
-  var length = array.length;
+  var length = array ? array.length : 0;
   if (initAccum && length) {
     accumulator = array[--length];
   }

_arraySome.js

@@ -3,14 +3,14 @@
  * shorthands.
  *
  * @private
- * @param {Array} array The array to iterate over.
+ * @param {Array} [array] The array to iterate over.
  * @param {Function} predicate The function invoked per iteration.
  * @returns {boolean} Returns `true` if any element passes the predicate check,
  *  else `false`.
  */
 function arraySome(array, predicate) {
   var index = -1,
-      length = array.length;
+      length = array ? array.length : 0;
 
   while (++index < length) {
     if (predicate(array[index], index, array)) {

_assignValue.js

@@ -8,7 +8,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
  * Assigns `value` to `key` of `object` if the existing value is not equivalent
- * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  * for equality comparisons.
  *
  * @private

_assocGet.js

@@ -1,16 +0,0 @@
-var assocIndexOf = require('./_assocIndexOf');
-
-/**
- * Gets the associative array value for `key`.
- *
- * @private
- * @param {Array} array The array to query.
- * @param {string} key The key of the value to get.
- * @returns {*} Returns the entry value.
- */
-function assocGet(array, key) {
-  var index = assocIndexOf(array, key);
-  return index < 0 ? undefined : array[index][1];
-}
-
-module.exports = assocGet;

_assocSet.js

@@ -1,20 +0,0 @@
-var assocIndexOf = require('./_assocIndexOf');
-
-/**
- * Sets the associative array `key` to `value`.
- *
- * @private
- * @param {Array} array The array to modify.
- * @param {string} key The key of the value to set.
- * @param {*} value The value to set.
- */
-function assocSet(array, key, value) {
-  var index = assocIndexOf(array, key);
-  if (index < 0) {
-    array.push([key, value]);
-  } else {
-    array[index][1] = value;
-  }
-}
-
-module.exports = assocSet;

_baseAt.js

@@ -6,7 +6,7 @@ var get = require('./get');
  * @private
  * @param {Object} object The object to iterate over.
  * @param {string[]} paths The property paths of elements to pick.
- * @returns {Array} Returns the new array of picked elements.
+ * @returns {Array} Returns the picked elements.
  */
 function baseAt(object, paths) {
   var index = -1,

_baseClamp.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.clamp` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.clamp` which doesn't coerce arguments.
  *
  * @private
  * @param {number} number The number to clamp.

_baseClone.js

@@ -125,12 +125,12 @@ function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
   if (!isArr) {
     var props = isFull ? getAllKeys(value) : keys(value);
   }
-  // Recursively populate clone (susceptible to call stack limits).
   arrayEach(props || value, function(subValue, key) {
     if (props) {
       key = subValue;
       subValue = value[key];
     }
+    // Recursively populate clone (susceptible to call stack limits).
     assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));
   });
   return result;

_baseConforms.js

@@ -1,32 +1,17 @@
-var keys = require('./keys');
+var baseConformsTo = require('./_baseConformsTo'),
+    keys = require('./keys');
 
 /**
  * The base implementation of `_.conforms` which doesn't clone `source`.
  *
  * @private
  * @param {Object} source The object of property predicates to conform to.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function baseConforms(source) {
-  var props = keys(source),
-      length = props.length;
-
+  var props = keys(source);
   return function(object) {
-    if (object == null) {
-      return !length;
-    }
-    var index = length;
-    while (index--) {
-      var key = props[index],
-          predicate = source[key],
-          value = object[key];
-
-      if ((value === undefined &&
-          !(key in Object(object))) || !predicate(value)) {
-        return false;
-      }
-    }
-    return true;
+    return baseConformsTo(object, source, props);
   };
 }
 

_baseConformsTo.js

@@ -0,0 +1,27 @@
+/**
+ * The base implementation of `_.conformsTo` which accepts `props` to check.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Object} source The object of property predicates to conform to.
+ * @returns {boolean} Returns `true` if `object` conforms, else `false`.
+ */
+function baseConformsTo(object, source, props) {
+  var length = props.length;
+  if (object == null) {
+    return !length;
+  }
+  object = Object(object);
+  while (length--) {
+    var key = props[length],
+        predicate = source[key],
+        value = object[key];
+
+    if ((value === undefined && !(key in object)) || !predicate(value)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+module.exports = baseConformsTo;

_baseDelay.js

@@ -2,14 +2,14 @@
 var FUNC_ERROR_TEXT = 'Expected a function';
 
 /**
- * The base implementation of `_.delay` and `_.defer` which accepts an array
- * of `func` arguments.
+ * The base implementation of `_.delay` and `_.defer` which accepts `args`
+ * to provide to `func`.
  *
  * @private
  * @param {Function} func The function to delay.
  * @param {number} wait The number of milliseconds to delay invocation.
- * @param {Object} args The arguments to provide to `func`.
- * @returns {number} Returns the timer id.
+ * @param {Array} args The arguments to provide to `func`.
+ * @returns {number|Object} Returns the timer id or timeout object.
  */
 function baseDelay(func, wait, args) {
   if (typeof func != 'function') {

_baseFindIndex.js

@@ -5,12 +5,13 @@
  * @private
  * @param {Array} array The array to search.
  * @param {Function} predicate The function invoked per iteration.
+ * @param {number} fromIndex The index to search from.
  * @param {boolean} [fromRight] Specify iterating from right to left.
  * @returns {number} Returns the index of the matched value, else `-1`.
  */
-function baseFindIndex(array, predicate, fromRight) {
+function baseFindIndex(array, predicate, fromIndex, fromRight) {
   var length = array.length,
-      index = fromRight ? length : -1;
+      index = fromIndex + (fromRight ? 1 : -1);
 
   while ((fromRight ? index-- : ++index < length)) {
     if (predicate(array[index], index, array)) {

_baseFindKey.js

@@ -1,25 +1,23 @@
 /**
- * The base implementation of methods like `_.find` and `_.findKey`, without
- * support for iteratee shorthands, which iterates over `collection` using
- * `eachFunc`.
+ * The base implementation of methods like `_.findKey` and `_.findLastKey`,
+ * without support for iteratee shorthands, which iterates over `collection`
+ * using `eachFunc`.
  *
  * @private
  * @param {Array|Object} collection The collection to search.
  * @param {Function} predicate The function invoked per iteration.
  * @param {Function} eachFunc The function to iterate over `collection`.
- * @param {boolean} [retKey] Specify returning the key of the found element
- *  instead of the element itself.
  * @returns {*} Returns the found element or its key, else `undefined`.
  */
-function baseFind(collection, predicate, eachFunc, retKey) {
+function baseFindKey(collection, predicate, eachFunc) {
   var result;
   eachFunc(collection, function(value, key, collection) {
     if (predicate(value, key, collection)) {
-      result = retKey ? key : value;
+      result = key;
       return false;
     }
   });
   return result;
 }
 
-module.exports = baseFind;
+module.exports = baseFindKey;

_baseFunctions.js

@@ -8,7 +8,7 @@ var arrayFilter = require('./_arrayFilter'),
  * @private
  * @param {Object} object The object to inspect.
  * @param {Array} props The property names to filter.
- * @returns {Array} Returns the new array of filtered property names.
+ * @returns {Array} Returns the function names.
  */
 function baseFunctions(object, props) {
   return arrayFilter(props, function(key) {

_baseGetAllKeys.js

@@ -14,9 +14,7 @@ var arrayPush = require('./_arrayPush'),
  */
 function baseGetAllKeys(object, keysFunc, symbolsFunc) {
   var result = keysFunc(object);
-  return isArray(object)
-    ? result
-    : arrayPush(result, symbolsFunc(object));
+  return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
 }
 
 module.exports = baseGetAllKeys;

_baseGetTag.js

@@ -0,0 +1,22 @@
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `getTag`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the `toStringTag`.
+ */
+function baseGetTag(value) {
+  return objectToString.call(value);
+}
+
+module.exports = baseGetTag;

_baseGt.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.gt` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.gt` which doesn't coerce arguments.
  *
  * @private
  * @param {*} value The value to compare.

_baseHas.js

@@ -1,5 +1,3 @@
-var getPrototype = require('./_getPrototype');
-
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
@@ -10,16 +8,12 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * The base implementation of `_.has` without support for deep paths.
  *
  * @private
- * @param {Object} object The object to query.
+ * @param {Object} [object] The object to query.
  * @param {Array|string} key The key to check.
  * @returns {boolean} Returns `true` if `key` exists, else `false`.
  */
 function baseHas(object, key) {
-  // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
-  // that are composed entirely of index properties, return `false` for
-  // `hasOwnProperty` checks of them.
-  return hasOwnProperty.call(object, key) ||
-    (typeof object == 'object' && key in object && getPrototype(object) === null);
+  return object != null && hasOwnProperty.call(object, key);
 }
 
 module.exports = baseHas;

_baseHasIn.js

@@ -2,12 +2,12 @@
  * The base implementation of `_.hasIn` without support for deep paths.
  *
  * @private
- * @param {Object} object The object to query.
+ * @param {Object} [object] The object to query.
  * @param {Array|string} key The key to check.
  * @returns {boolean} Returns `true` if `key` exists, else `false`.
  */
 function baseHasIn(object, key) {
-  return key in Object(object);
+  return object != null && key in Object(object);
 }
 
 module.exports = baseHasIn;

_baseInRange.js

@@ -3,7 +3,7 @@ var nativeMax = Math.max,
     nativeMin = Math.min;
 
 /**
- * The base implementation of `_.inRange` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.inRange` which doesn't coerce arguments.
  *
  * @private
  * @param {number} number The number to check.

_baseIndexOf.js

@@ -1,4 +1,5 @@
-var indexOfNaN = require('./_indexOfNaN');
+var baseFindIndex = require('./_baseFindIndex'),
+    baseIsNaN = require('./_baseIsNaN');
 
 /**
  * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
@@ -11,7 +12,7 @@ var indexOfNaN = require('./_indexOfNaN');
  */
 function baseIndexOf(array, value, fromIndex) {
   if (value !== value) {
-    return indexOfNaN(array, fromIndex);
+    return baseFindIndex(array, baseIsNaN, fromIndex);
   }
   var index = fromIndex - 1,
       length = array.length;

_baseIsArrayBuffer.js

@@ -0,0 +1,26 @@
+var isObjectLike = require('./isObjectLike');
+
+var arrayBufferTag = '[object ArrayBuffer]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
+ */
+function baseIsArrayBuffer(value) {
+  return isObjectLike(value) && objectToString.call(value) == arrayBufferTag;
+}
+
+module.exports = baseIsArrayBuffer;

_baseIsDate.js

@@ -0,0 +1,27 @@
+var isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var dateTag = '[object Date]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isDate` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
+ */
+function baseIsDate(value) {
+  return isObjectLike(value) && objectToString.call(value) == dateTag;
+}
+
+module.exports = baseIsDate;

_baseIsMap.js

@@ -0,0 +1,18 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var mapTag = '[object Map]';
+
+/**
+ * The base implementation of `_.isMap` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a map, else `false`.
+ */
+function baseIsMap(value) {
+  return isObjectLike(value) && getTag(value) == mapTag;
+}
+
+module.exports = baseIsMap;

_baseIsNaN.js

@@ -0,0 +1,12 @@
+/**
+ * The base implementation of `_.isNaN` without support for number objects.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
+ */
+function baseIsNaN(value) {
+  return value !== value;
+}
+
+module.exports = baseIsNaN;

_baseIsNative.js

@@ -0,0 +1,47 @@
+var isFunction = require('./isFunction'),
+    isHostObject = require('./_isHostObject'),
+    isMasked = require('./_isMasked'),
+    isObject = require('./isObject'),
+    toSource = require('./_toSource');
+
+/**
+ * Used to match `RegExp`
+ * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
+ */
+var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
+
+/** Used to detect host constructors (Safari). */
+var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to resolve the decompiled source of functions. */
+var funcToString = Function.prototype.toString;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/** Used to detect if a method is native. */
+var reIsNative = RegExp('^' +
+  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
+  .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+);
+
+/**
+ * The base implementation of `_.isNative` without bad shim checks.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a native function,
+ *  else `false`.
+ */
+function baseIsNative(value) {
+  if (!isObject(value) || isMasked(value)) {
+    return false;
+  }
+  var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
+  return pattern.test(toSource(value));
+}
+
+module.exports = baseIsNative;

_baseIsRegExp.js

@@ -0,0 +1,27 @@
+var isObject = require('./isObject');
+
+/** `Object#toString` result references. */
+var regexpTag = '[object RegExp]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isRegExp` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
+ */
+function baseIsRegExp(value) {
+  return isObject(value) && objectToString.call(value) == regexpTag;
+}
+
+module.exports = baseIsRegExp;

_baseIsSet.js

@@ -0,0 +1,18 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var setTag = '[object Set]';
+
+/**
+ * The base implementation of `_.isSet` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a set, else `false`.
+ */
+function baseIsSet(value) {
+  return isObjectLike(value) && getTag(value) == setTag;
+}
+
+module.exports = baseIsSet;

_baseIsTypedArray.js

@@ -0,0 +1,69 @@
+var isLength = require('./isLength'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var argsTag = '[object Arguments]',
+    arrayTag = '[object Array]',
+    boolTag = '[object Boolean]',
+    dateTag = '[object Date]',
+    errorTag = '[object Error]',
+    funcTag = '[object Function]',
+    mapTag = '[object Map]',
+    numberTag = '[object Number]',
+    objectTag = '[object Object]',
+    regexpTag = '[object RegExp]',
+    setTag = '[object Set]',
+    stringTag = '[object String]',
+    weakMapTag = '[object WeakMap]';
+
+var arrayBufferTag = '[object ArrayBuffer]',
+    dataViewTag = '[object DataView]',
+    float32Tag = '[object Float32Array]',
+    float64Tag = '[object Float64Array]',
+    int8Tag = '[object Int8Array]',
+    int16Tag = '[object Int16Array]',
+    int32Tag = '[object Int32Array]',
+    uint8Tag = '[object Uint8Array]',
+    uint8ClampedTag = '[object Uint8ClampedArray]',
+    uint16Tag = '[object Uint16Array]',
+    uint32Tag = '[object Uint32Array]';
+
+/** Used to identify `toStringTag` values of typed arrays. */
+var typedArrayTags = {};
+typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+typedArrayTags[uint32Tag] = true;
+typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
+typedArrayTags[errorTag] = typedArrayTags[funcTag] =
+typedArrayTags[mapTag] = typedArrayTags[numberTag] =
+typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
+typedArrayTags[setTag] = typedArrayTags[stringTag] =
+typedArrayTags[weakMapTag] = false;
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.isTypedArray` without Node.js optimizations.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
+ */
+function baseIsTypedArray(value) {
+  return isObjectLike(value) &&
+    isLength(value.length) && !!typedArrayTags[objectToString.call(value)];
+}
+
+module.exports = baseIsTypedArray;

_baseKeys.js

@@ -1,16 +1,30 @@
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeKeys = Object.keys;
+var isPrototype = require('./_isPrototype'),
+    nativeKeys = require('./_nativeKeys');
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
- * The base implementation of `_.keys` which doesn't skip the constructor
- * property of prototypes or treat sparse arrays as dense.
+ * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
  *
  * @private
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of property names.
  */
 function baseKeys(object) {
-  return nativeKeys(Object(object));
+  if (!isPrototype(object)) {
+    return nativeKeys(object);
+  }
+  var result = [];
+  for (var key in Object(object)) {
+    if (hasOwnProperty.call(object, key) && key != 'constructor') {
+      result.push(key);
+    }
+  }
+  return result;
 }
 
 module.exports = baseKeys;

_baseKeysIn.js

@@ -1,36 +1,33 @@
-var Reflect = require('./_Reflect'),
-    iteratorToArray = require('./_iteratorToArray');
+var isObject = require('./isObject'),
+    isPrototype = require('./_isPrototype'),
+    nativeKeysIn = require('./_nativeKeysIn');
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
-/** Built-in value references. */
-var enumerate = Reflect ? Reflect.enumerate : undefined,
-    propertyIsEnumerable = objectProto.propertyIsEnumerable;
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
- * The base implementation of `_.keysIn` which doesn't skip the constructor
- * property of prototypes or treat sparse arrays as dense.
+ * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
  *
  * @private
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of property names.
  */
 function baseKeysIn(object) {
-  object = object == null ? object : Object(object);
+  if (!isObject(object)) {
+    return nativeKeysIn(object);
+  }
+  var isProto = isPrototype(object),
+      result = [];
 
-  var result = [];
   for (var key in object) {
-    result.push(key);
+    if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
+      result.push(key);
+    }
   }
   return result;
 }
 
-// Fallback for IE < 9 with es6-shim.
-if (enumerate && !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf')) {
-  baseKeysIn = function(object) {
-    return iteratorToArray(enumerate(object));
-  };
-}
-
 module.exports = baseKeysIn;

_baseLt.js

@@ -1,5 +1,5 @@
 /**
- * The base implementation of `_.lt` which doesn't coerce arguments to numbers.
+ * The base implementation of `_.lt` which doesn't coerce arguments.
  *
  * @private
  * @param {*} value The value to compare.

_baseMatches.js

@@ -7,7 +7,7 @@ var baseIsMatch = require('./_baseIsMatch'),
  *
  * @private
  * @param {Object} source The object of property values to match.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function baseMatches(source) {
   var matchData = getMatchData(source);

_baseMatchesProperty.js

@@ -16,7 +16,7 @@ var UNORDERED_COMPARE_FLAG = 1,
  * @private
  * @param {string} path The path of the property to get.
  * @param {*} srcValue The value to match.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new spec function.
  */
 function baseMatchesProperty(path, srcValue) {
   if (isKey(path) && isStrictComparable(srcValue)) {

_baseMerge.js

@@ -1,11 +1,11 @@
 var Stack = require('./_Stack'),
     arrayEach = require('./_arrayEach'),
     assignMergeValue = require('./_assignMergeValue'),
+    baseKeysIn = require('./_baseKeysIn'),
     baseMergeDeep = require('./_baseMergeDeep'),
     isArray = require('./isArray'),
     isObject = require('./isObject'),
-    isTypedArray = require('./isTypedArray'),
-    keysIn = require('./keysIn');
+    isTypedArray = require('./isTypedArray');
 
 /**
  * The base implementation of `_.merge` without support for multiple sources.
@@ -23,7 +23,7 @@ function baseMerge(object, source, srcIndex, customizer, stack) {
     return;
   }
   if (!(isArray(source) || isTypedArray(source))) {
-    var props = keysIn(source);
+    var props = baseKeysIn(source);
   }
   arrayEach(props || source, function(srcValue, key) {
     if (props) {

_baseMergeDeep.js

@@ -70,13 +70,12 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       isCommon = false;
     }
   }
-  stack.set(srcValue, newValue);
-
   if (isCommon) {
     // Recursively merge objects and arrays (susceptible to call stack limits).
+    stack.set(srcValue, newValue);
     mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
+    stack['delete'](srcValue);
   }
-  stack['delete'](srcValue);
   assignMergeValue(object, key, newValue);
 }
 

_baseNth.js

@@ -1,7 +1,7 @@
 var isIndex = require('./_isIndex');
 
 /**
- * The base implementation of `_.nth` which doesn't coerce `n` to an integer.
+ * The base implementation of `_.nth` which doesn't coerce arguments.
  *
  * @private
  * @param {Array} array The array to query.

_basePick.js

@@ -1,4 +1,4 @@
-var arrayReduce = require('./_arrayReduce');
+var basePickBy = require('./_basePickBy');
 
 /**
  * The base implementation of `_.pick` without support for individual
@@ -11,12 +11,9 @@ var arrayReduce = require('./_arrayReduce');
  */
 function basePick(object, props) {
   object = Object(object);
-  return arrayReduce(props, function(result, key) {
-    if (key in object) {
-      result[key] = object[key];
-    }
-    return result;
-  }, {});
+  return basePickBy(object, props, function(value, key) {
+    return key in object;
+  });
 }
 
 module.exports = basePick;

_basePickBy.js

@@ -1,16 +1,14 @@
-var getAllKeysIn = require('./_getAllKeysIn');
-
 /**
  * The base implementation of  `_.pickBy` without support for iteratee shorthands.
  *
  * @private
  * @param {Object} object The source object.
+ * @param {string[]} props The property identifiers to pick from.
  * @param {Function} predicate The function invoked per property.
  * @returns {Object} Returns the new object.
  */
-function basePickBy(object, predicate) {
+function basePickBy(object, props, predicate) {
   var index = -1,
-      props = getAllKeysIn(object),
       length = props.length,
       result = {};
 

_baseProperty.js

@@ -3,7 +3,7 @@
  *
  * @private
  * @param {string} key The key of the property to get.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new accessor function.
  */
 function baseProperty(key) {
   return function(object) {

_basePropertyDeep.js

@@ -5,7 +5,7 @@ var baseGet = require('./_baseGet');
  *
  * @private
  * @param {Array|string} path The path of the property to get.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new accessor function.
  */
 function basePropertyDeep(path) {
   return function(object) {

_basePropertyOf.js

@@ -0,0 +1,14 @@
+/**
+ * The base implementation of `_.propertyOf` without support for deep paths.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Function} Returns the new accessor function.
+ */
+function basePropertyOf(object) {
+  return function(key) {
+    return object == null ? undefined : object[key];
+  };
+}
+
+module.exports = basePropertyOf;

_basePullAll.js

@@ -1,7 +1,8 @@
 var arrayMap = require('./_arrayMap'),
     baseIndexOf = require('./_baseIndexOf'),
     baseIndexOfWith = require('./_baseIndexOfWith'),
-    baseUnary = require('./_baseUnary');
+    baseUnary = require('./_baseUnary'),
+    copyArray = require('./_copyArray');
 
 /** Used for built-in method references. */
 var arrayProto = Array.prototype;
@@ -26,6 +27,9 @@ function basePullAll(array, values, iteratee, comparator) {
       length = values.length,
       seen = array;
 
+  if (array === values) {
+    values = copyArray(values);
+  }
   if (iteratee) {
     seen = arrayMap(array, baseUnary(iteratee));
   }

_baseRange.js

@@ -4,14 +4,14 @@ var nativeCeil = Math.ceil,
 
 /**
  * The base implementation of `_.range` and `_.rangeRight` which doesn't
- * coerce arguments to numbers.
+ * coerce arguments.
  *
  * @private
  * @param {number} start The start of the range.
  * @param {number} end The end of the range.
  * @param {number} step The value to increment or decrement by.
  * @param {boolean} [fromRight] Specify iterating from right to left.
- * @returns {Array} Returns the new array of numbers.
+ * @returns {Array} Returns the range of numbers.
  */
 function baseRange(start, end, step, fromRight) {
   var index = -1,

_baseRest.js

@@ -0,0 +1,35 @@
+var apply = require('./_apply');
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * The base implementation of `_.rest` which doesn't validate or coerce arguments.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @returns {Function} Returns the new function.
+ */
+function baseRest(func, start) {
+  start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+  return function() {
+    var args = arguments,
+        index = -1,
+        length = nativeMax(args.length - start, 0),
+        array = Array(length);
+
+    while (++index < length) {
+      array[index] = args[start + index];
+    }
+    index = -1;
+    var otherArgs = Array(start + 1);
+    while (++index < start) {
+      otherArgs[index] = args[index];
+    }
+    otherArgs[start] = array;
+    return apply(func, this, otherArgs);
+  };
+}
+
+module.exports = baseRest;

_baseSet.js

@@ -16,6 +16,9 @@ var assignValue = require('./_assignValue'),
  * @returns {Object} Returns `object`.
  */
 function baseSet(object, path, value, customizer) {
+  if (!isObject(object)) {
+    return object;
+  }
   path = isKey(path, object) ? [path] : castPath(path);
 
   var index = -1,
@@ -24,20 +27,19 @@ function baseSet(object, path, value, customizer) {
       nested = object;
 
   while (nested != null && ++index < length) {
-    var key = toKey(path[index]);
-    if (isObject(nested)) {
-      var newValue = value;
-      if (index != lastIndex) {
-        var objValue = nested[key];
-        newValue = customizer ? customizer(objValue, key, nested) : undefined;
-        if (newValue === undefined) {
-          newValue = objValue == null
-            ? (isIndex(path[index + 1]) ? [] : {})
-            : objValue;
-        }
+    var key = toKey(path[index]),
+        newValue = value;
+
+    if (index != lastIndex) {
+      var objValue = nested[key];
+      newValue = customizer ? customizer(objValue, key, nested) : undefined;
+      if (newValue === undefined) {
+        newValue = isObject(objValue)
+          ? objValue
+          : (isIndex(path[index + 1]) ? [] : {});
       }
-      assignValue(nested, key, newValue);
     }
+    assignValue(nested, key, newValue);
     nested = nested[key];
   }
   return object;

_baseToPairs.js

@@ -7,7 +7,7 @@ var arrayMap = require('./_arrayMap');
  * @private
  * @param {Object} object The object to query.
  * @param {Array} props The property names to get values for.
- * @returns {Object} Returns the new array of key-value pairs.
+ * @returns {Object} Returns the key-value pairs.
  */
 function baseToPairs(object, props) {
   return arrayMap(props, function(key) {

_baseUnary.js

@@ -1,9 +1,9 @@
 /**
- * The base implementation of `_.unary` without support for storing wrapper metadata.
+ * The base implementation of `_.unary` without support for storing metadata.
  *
  * @private
  * @param {Function} func The function to cap arguments for.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new capped function.
  */
 function baseUnary(func) {
   return function(value) {

_baseUnset.js

@@ -1,10 +1,15 @@
-var baseHas = require('./_baseHas'),
-    castPath = require('./_castPath'),
+var castPath = require('./_castPath'),
     isKey = require('./_isKey'),
     last = require('./last'),
     parent = require('./_parent'),
     toKey = require('./_toKey');
 
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
 /**
  * The base implementation of `_.unset`.
  *
@@ -18,7 +23,7 @@ function baseUnset(object, path) {
   object = parent(object, path);
 
   var key = toKey(last(path));
-  return !(object != null && baseHas(object, key)) || delete object[key];
+  return !(object != null && hasOwnProperty.call(object, key)) || delete object[key];
 }
 
 module.exports = baseUnset;

_cacheHas.js

@@ -1,25 +1,13 @@
-var isKeyable = require('./_isKeyable');
-
-/** Used to stand-in for `undefined` hash values. */
-var HASH_UNDEFINED = '__lodash_hash_undefined__';
-
 /**
- * Checks if `value` is in `cache`.
+ * Checks if a cache value for `key` exists.
  *
  * @private
- * @param {Object} cache The set cache to search.
- * @param {*} value The value to search for.
- * @returns {number} Returns `true` if `value` is found, else `false`.
+ * @param {Object} cache The cache to query.
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
-function cacheHas(cache, value) {
-  var map = cache.__data__;
-  if (isKeyable(value)) {
-    var data = map.__data__,
-        hash = typeof value == 'string' ? data.string : data.hash;
-
-    return hash[value] === HASH_UNDEFINED;
-  }
-  return map.has(value);
+function cacheHas(cache, key) {
+  return cache.has(key);
 }
 
 module.exports = cacheHas;

_cachePush.js

@@ -1,27 +0,0 @@
-var isKeyable = require('./_isKeyable');
-
-/** Used to stand-in for `undefined` hash values. */
-var HASH_UNDEFINED = '__lodash_hash_undefined__';
-
-/**
- * Adds `value` to the set cache.
- *
- * @private
- * @name push
- * @memberOf SetCache
- * @param {*} value The value to cache.
- */
-function cachePush(value) {
-  var map = this.__data__;
-  if (isKeyable(value)) {
-    var data = map.__data__,
-        hash = typeof value == 'string' ? data.string : data.hash;
-
-    hash[value] = HASH_UNDEFINED;
-  }
-  else {
-    map.set(value, HASH_UNDEFINED);
-  }
-}
-
-module.exports = cachePush;

_checkGlobal.js

@@ -1,12 +0,0 @@
-/**
- * Checks if `value` is a global object.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {null|Object} Returns `value` if it's a global object, else `null`.
- */
-function checkGlobal(value) {
-  return (value && value.Object === Object) ? value : null;
-}
-
-module.exports = checkGlobal;

_composeArgs.js

@@ -6,7 +6,7 @@ var nativeMax = Math.max;
  * placeholders, and provided arguments into a single array of arguments.
  *
  * @private
- * @param {Array|Object} args The provided arguments.
+ * @param {Array} args The provided arguments.
  * @param {Array} partials The arguments to prepend to those provided.
  * @param {Array} holders The `partials` placeholder indexes.
  * @params {boolean} [isCurried] Specify composing for a curried function.

_composeArgsRight.js

@@ -6,7 +6,7 @@ var nativeMax = Math.max;
  * is tailored for `_.partialRight`.
  *
  * @private
- * @param {Array|Object} args The provided arguments.
+ * @param {Array} args The provided arguments.
  * @param {Array} partials The arguments to append to those provided.
  * @param {Array} holders The `partials` placeholder indexes.
  * @params {boolean} [isCurried] Specify composing for a curried function.

_copyObject.js

@@ -21,9 +21,9 @@ function copyObject(source, props, object, customizer) {
 
     var newValue = customizer
       ? customizer(object[key], source[key], key, object, source)
-      : source[key];
+      : undefined;
 
-    assignValue(object, key, newValue);
+    assignValue(object, key, newValue === undefined ? source[key] : newValue);
   }
   return object;
 }

_coreJsData.js

@@ -0,0 +1,6 @@
+var root = require('./_root');
+
+/** Used to detect overreaching core-js shims. */
+var coreJsData = root['__core-js_shared__'];
+
+module.exports = coreJsData;

_createAggregator.js

@@ -16,7 +16,7 @@ function createAggregator(setter, initializer) {
     var func = isArray(collection) ? arrayAggregator : baseAggregator,
         accumulator = initializer ? initializer() : {};
 
-    return func(collection, setter, baseIteratee(iteratee), accumulator);
+    return func(collection, setter, baseIteratee(iteratee, 2), accumulator);
   };
 }
 

_createAssigner.js

@@ -1,5 +1,5 @@
-var isIterateeCall = require('./_isIterateeCall'),
-    rest = require('./rest');
+var baseRest = require('./_baseRest'),
+    isIterateeCall = require('./_isIterateeCall');
 
 /**
  * Creates a function like `_.assign`.
@@ -9,13 +9,13 @@ var isIterateeCall = require('./_isIterateeCall'),
  * @returns {Function} Returns the new assigner function.
  */
 function createAssigner(assigner) {
-  return rest(function(object, sources) {
+  return baseRest(function(object, sources) {
     var index = -1,
         length = sources.length,
         customizer = length > 1 ? sources[length - 1] : undefined,
         guard = length > 2 ? sources[2] : undefined;
 
-    customizer = typeof customizer == 'function'
+    customizer = (assigner.length > 3 && typeof customizer == 'function')
       ? (length--, customizer)
       : undefined;
 

_createBind.js

@@ -1,7 +1,7 @@
-var createCtorWrapper = require('./_createCtorWrapper'),
+var createCtor = require('./_createCtor'),
     root = require('./_root');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1;
 
 /**
@@ -10,14 +10,13 @@ var BIND_FLAG = 1;
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {*} [thisArg] The `this` binding of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createBaseWrapper(func, bitmask, thisArg) {
+function createBind(func, bitmask, thisArg) {
   var isBind = bitmask & BIND_FLAG,
-      Ctor = createCtorWrapper(func);
+      Ctor = createCtor(func);
 
   function wrapper() {
     var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
@@ -26,4 +25,4 @@ function createBaseWrapper(func, bitmask, thisArg) {
   return wrapper;
 }
 
-module.exports = createBaseWrapper;
+module.exports = createBind;

_createCaseFirst.js

@@ -8,7 +8,7 @@ var castSlice = require('./_castSlice'),
  *
  * @private
  * @param {string} methodName The name of the `String` case method to use.
- * @returns {Function} Returns the new function.
+ * @returns {Function} Returns the new case function.
  */
 function createCaseFirst(methodName) {
   return function(string) {

_createCtor.js

@@ -9,10 +9,10 @@ var baseCreate = require('./_baseCreate'),
  * @param {Function} Ctor The constructor to wrap.
  * @returns {Function} Returns the new wrapped function.
  */
-function createCtorWrapper(Ctor) {
+function createCtor(Ctor) {
   return function() {
     // Use a `switch` statement to work with class constructors. See
-    // http://ecma-international.org/ecma-262/6.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
+    // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
     // for more details.
     var args = arguments;
     switch (args.length) {
@@ -34,4 +34,4 @@ function createCtorWrapper(Ctor) {
   };
 }
 
-module.exports = createCtorWrapper;
+module.exports = createCtor;

_createCurry.js

@@ -1,8 +1,8 @@
 var apply = require('./_apply'),
-    createCtorWrapper = require('./_createCtorWrapper'),
-    createHybridWrapper = require('./_createHybridWrapper'),
-    createRecurryWrapper = require('./_createRecurryWrapper'),
-    getPlaceholder = require('./_getPlaceholder'),
+    createCtor = require('./_createCtor'),
+    createHybrid = require('./_createHybrid'),
+    createRecurry = require('./_createRecurry'),
+    getHolder = require('./_getHolder'),
     replaceHolders = require('./_replaceHolders'),
     root = require('./_root');
 
@@ -11,19 +11,18 @@ var apply = require('./_apply'),
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {number} arity The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createCurryWrapper(func, bitmask, arity) {
-  var Ctor = createCtorWrapper(func);
+function createCurry(func, bitmask, arity) {
+  var Ctor = createCtor(func);
 
   function wrapper() {
     var length = arguments.length,
         args = Array(length),
         index = length,
-        placeholder = getPlaceholder(wrapper);
+        placeholder = getHolder(wrapper);
 
     while (index--) {
       args[index] = arguments[index];
@@ -34,8 +33,8 @@ function createCurryWrapper(func, bitmask, arity) {
 
     length -= holders.length;
     if (length < arity) {
-      return createRecurryWrapper(
-        func, bitmask, createHybridWrapper, wrapper.placeholder, undefined,
+      return createRecurry(
+        func, bitmask, createHybrid, wrapper.placeholder, undefined,
         args, holders, undefined, undefined, arity - length);
     }
     var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
@@ -44,4 +43,4 @@ function createCurryWrapper(func, bitmask, arity) {
   return wrapper;
 }
 
-module.exports = createCurryWrapper;
+module.exports = createCurry;

_createFind.js

@@ -0,0 +1,25 @@
+var baseIteratee = require('./_baseIteratee'),
+    isArrayLike = require('./isArrayLike'),
+    keys = require('./keys');
+
+/**
+ * Creates a `_.find` or `_.findLast` function.
+ *
+ * @private
+ * @param {Function} findIndexFunc The function to find the collection index.
+ * @returns {Function} Returns the new find function.
+ */
+function createFind(findIndexFunc) {
+  return function(collection, predicate, fromIndex) {
+    var iterable = Object(collection);
+    if (!isArrayLike(collection)) {
+      var iteratee = baseIteratee(predicate, 3);
+      collection = keys(collection);
+      predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+    }
+    var index = findIndexFunc(collection, predicate, fromIndex);
+    return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
+  };
+}
+
+module.exports = createFind;

_createFlow.js

@@ -1,10 +1,10 @@
 var LodashWrapper = require('./_LodashWrapper'),
     baseFlatten = require('./_baseFlatten'),
+    baseRest = require('./_baseRest'),
     getData = require('./_getData'),
     getFuncName = require('./_getFuncName'),
     isArray = require('./isArray'),
-    isLaziable = require('./_isLaziable'),
-    rest = require('./rest');
+    isLaziable = require('./_isLaziable');
 
 /** Used as the size to enable large array optimizations. */
 var LARGE_ARRAY_SIZE = 200;
@@ -12,7 +12,7 @@ var LARGE_ARRAY_SIZE = 200;
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var CURRY_FLAG = 8,
     PARTIAL_FLAG = 32,
     ARY_FLAG = 128,
@@ -26,7 +26,7 @@ var CURRY_FLAG = 8,
  * @returns {Function} Returns the new flow function.
  */
 function createFlow(fromRight) {
-  return rest(function(funcs) {
+  return baseRest(function(funcs) {
     funcs = baseFlatten(funcs, 1);
 
     var length = funcs.length,

_createHybrid.js

@@ -1,14 +1,14 @@
 var composeArgs = require('./_composeArgs'),
     composeArgsRight = require('./_composeArgsRight'),
     countHolders = require('./_countHolders'),
-    createCtorWrapper = require('./_createCtorWrapper'),
-    createRecurryWrapper = require('./_createRecurryWrapper'),
-    getPlaceholder = require('./_getPlaceholder'),
+    createCtor = require('./_createCtor'),
+    createRecurry = require('./_createRecurry'),
+    getHolder = require('./_getHolder'),
     reorder = require('./_reorder'),
     replaceHolders = require('./_replaceHolders'),
     root = require('./_root');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_FLAG = 8,
@@ -22,8 +22,7 @@ var BIND_FLAG = 1,
  *
  * @private
  * @param {Function|string} func The function or method name to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {*} [thisArg] The `this` binding of `func`.
  * @param {Array} [partials] The arguments to prepend to those provided to
  *  the new function.
@@ -36,24 +35,24 @@ var BIND_FLAG = 1,
  * @param {number} [arity] The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createHybridWrapper(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
+function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
   var isAry = bitmask & ARY_FLAG,
       isBind = bitmask & BIND_FLAG,
       isBindKey = bitmask & BIND_KEY_FLAG,
       isCurried = bitmask & (CURRY_FLAG | CURRY_RIGHT_FLAG),
       isFlip = bitmask & FLIP_FLAG,
-      Ctor = isBindKey ? undefined : createCtorWrapper(func);
+      Ctor = isBindKey ? undefined : createCtor(func);
 
   function wrapper() {
     var length = arguments.length,
-        index = length,
-        args = Array(length);
+        args = Array(length),
+        index = length;
 
     while (index--) {
       args[index] = arguments[index];
     }
     if (isCurried) {
-      var placeholder = getPlaceholder(wrapper),
+      var placeholder = getHolder(wrapper),
           holdersCount = countHolders(args, placeholder);
     }
     if (partials) {
@@ -65,8 +64,8 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
     length -= holdersCount;
     if (isCurried && length < arity) {
       var newHolders = replaceHolders(args, placeholder);
-      return createRecurryWrapper(
-        func, bitmask, createHybridWrapper, wrapper.placeholder, thisArg,
+      return createRecurry(
+        func, bitmask, createHybrid, wrapper.placeholder, thisArg,
         args, newHolders, argPos, ary, arity - length
       );
     }
@@ -83,11 +82,11 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
       args.length = ary;
     }
     if (this && this !== root && this instanceof wrapper) {
-      fn = Ctor || createCtorWrapper(fn);
+      fn = Ctor || createCtor(fn);
     }
     return fn.apply(thisBinding, args);
   }
   return wrapper;
 }
 
-module.exports = createHybridWrapper;
+module.exports = createHybrid;

_createMathOperation.js

@@ -6,13 +6,14 @@ var baseToNumber = require('./_baseToNumber'),
  *
  * @private
  * @param {Function} operator The function to perform the operation.
+ * @param {number} [defaultValue] The value used for `undefined` arguments.
  * @returns {Function} Returns the new mathematical operation function.
  */
-function createMathOperation(operator) {
+function createMathOperation(operator, defaultValue) {
   return function(value, other) {
     var result;
     if (value === undefined && other === undefined) {
-      return 0;
+      return defaultValue;
     }
     if (value !== undefined) {
       result = value;

_createOver.js

@@ -2,25 +2,24 @@ var apply = require('./_apply'),
     arrayMap = require('./_arrayMap'),
     baseFlatten = require('./_baseFlatten'),
     baseIteratee = require('./_baseIteratee'),
+    baseRest = require('./_baseRest'),
     baseUnary = require('./_baseUnary'),
-    isArray = require('./isArray'),
-    isFlattenableIteratee = require('./_isFlattenableIteratee'),
-    rest = require('./rest');
+    isArray = require('./isArray');
 
 /**
  * Creates a function like `_.over`.
  *
  * @private
  * @param {Function} arrayFunc The function to iterate over iteratees.
- * @returns {Function} Returns the new invoker function.
+ * @returns {Function} Returns the new over function.
  */
 function createOver(arrayFunc) {
-  return rest(function(iteratees) {
+  return baseRest(function(iteratees) {
     iteratees = (iteratees.length == 1 && isArray(iteratees[0]))
       ? arrayMap(iteratees[0], baseUnary(baseIteratee))
-      : arrayMap(baseFlatten(iteratees, 1, isFlattenableIteratee), baseUnary(baseIteratee));
+      : arrayMap(baseFlatten(iteratees, 1), baseUnary(baseIteratee));
 
-    return rest(function(args) {
+    return baseRest(function(args) {
       var thisArg = this;
       return arrayFunc(iteratees, function(iteratee) {
         return apply(iteratee, thisArg, args);

_createPartial.js

@@ -1,8 +1,8 @@
 var apply = require('./_apply'),
-    createCtorWrapper = require('./_createCtorWrapper'),
+    createCtor = require('./_createCtor'),
     root = require('./_root');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1;
 
 /**
@@ -11,16 +11,15 @@ var BIND_FLAG = 1;
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {*} thisArg The `this` binding of `func`.
  * @param {Array} partials The arguments to prepend to those provided to
  *  the new function.
  * @returns {Function} Returns the new wrapped function.
  */
-function createPartialWrapper(func, bitmask, thisArg, partials) {
+function createPartial(func, bitmask, thisArg, partials) {
   var isBind = bitmask & BIND_FLAG,
-      Ctor = createCtorWrapper(func);
+      Ctor = createCtor(func);
 
   function wrapper() {
     var argsIndex = -1,
@@ -41,4 +40,4 @@ function createPartialWrapper(func, bitmask, thisArg, partials) {
   return wrapper;
 }
 
-module.exports = createPartialWrapper;
+module.exports = createPartial;

_createRange.js

@@ -1,6 +1,6 @@
 var baseRange = require('./_baseRange'),
     isIterateeCall = require('./_isIterateeCall'),
-    toNumber = require('./toNumber');
+    toFinite = require('./toFinite');
 
 /**
  * Creates a `_.range` or `_.rangeRight` function.
@@ -15,15 +15,14 @@ function createRange(fromRight) {
       end = step = undefined;
     }
     // Ensure the sign of `-0` is preserved.
-    start = toNumber(start);
-    start = start === start ? start : 0;
+    start = toFinite(start);
     if (end === undefined) {
       end = start;
       start = 0;
     } else {
-      end = toNumber(end) || 0;
+      end = toFinite(end);
     }
-    step = step === undefined ? (start < end ? 1 : -1) : (toNumber(step) || 0);
+    step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
     return baseRange(start, end, step, fromRight);
   };
 }

_createRecurry.js

@@ -1,7 +1,8 @@
 var isLaziable = require('./_isLaziable'),
-    setData = require('./_setData');
+    setData = require('./_setData'),
+    setWrapToString = require('./_setWrapToString');
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_BOUND_FLAG = 4,
@@ -14,8 +15,7 @@ var BIND_FLAG = 1,
  *
  * @private
  * @param {Function} func The function to wrap.
- * @param {number} bitmask The bitmask of wrapper flags. See `createWrapper`
- *  for more details.
+ * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @param {Function} wrapFunc The function to create the `func` wrapper.
  * @param {*} placeholder The placeholder value.
  * @param {*} [thisArg] The `this` binding of `func`.
@@ -27,7 +27,7 @@ var BIND_FLAG = 1,
  * @param {number} [arity] The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createRecurryWrapper(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
+function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
   var isCurry = bitmask & CURRY_FLAG,
       newHolders = isCurry ? holders : undefined,
       newHoldersRight = isCurry ? undefined : holders,
@@ -50,7 +50,7 @@ function createRecurryWrapper(func, bitmask, wrapFunc, placeholder, thisArg, par
     setData(result, newData);
   }
   result.placeholder = placeholder;
-  return result;
+  return setWrapToString(result, func, bitmask);
 }
 
-module.exports = createRecurryWrapper;
+module.exports = createRecurry;

_createRound.js

@@ -2,6 +2,9 @@ var toInteger = require('./toInteger'),
     toNumber = require('./toNumber'),
     toString = require('./toString');
 
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
 /**
  * Creates a function like `_.round`.
  *
@@ -13,7 +16,7 @@ function createRound(methodName) {
   var func = Math[methodName];
   return function(number, precision) {
     number = toNumber(number);
-    precision = toInteger(precision);
+    precision = nativeMin(toInteger(precision), 292);
     if (precision) {
       // Shift with exponential notation to avoid floating-point issues.
       // See [MDN](https://mdn.io/round#Examples) for more details.

_createSet.js

@@ -6,7 +6,7 @@ var Set = require('./_Set'),
 var INFINITY = 1 / 0;
 
 /**
- * Creates a set of `values`.
+ * Creates a set object of `values`.
  *
  * @private
  * @param {Array} values The values to add to the set.

_createToPairs.js

@@ -0,0 +1,30 @@
+var baseToPairs = require('./_baseToPairs'),
+    getTag = require('./_getTag'),
+    mapToArray = require('./_mapToArray'),
+    setToPairs = require('./_setToPairs');
+
+/** `Object#toString` result references. */
+var mapTag = '[object Map]',
+    setTag = '[object Set]';
+
+/**
+ * Creates a `_.toPairs` or `_.toPairsIn` function.
+ *
+ * @private
+ * @param {Function} keysFunc The function to get the keys of a given object.
+ * @returns {Function} Returns the new pairs function.
+ */
+function createToPairs(keysFunc) {
+  return function(object) {
+    var tag = getTag(object);
+    if (tag == mapTag) {
+      return mapToArray(object);
+    }
+    if (tag == setTag) {
+      return setToPairs(object);
+    }
+    return baseToPairs(object, keysFunc(object));
+  };
+}
+
+module.exports = createToPairs;

_createWrap.js

@@ -1,17 +1,18 @@
 var baseSetData = require('./_baseSetData'),
-    createBaseWrapper = require('./_createBaseWrapper'),
-    createCurryWrapper = require('./_createCurryWrapper'),
-    createHybridWrapper = require('./_createHybridWrapper'),
-    createPartialWrapper = require('./_createPartialWrapper'),
+    createBind = require('./_createBind'),
+    createCurry = require('./_createCurry'),
+    createHybrid = require('./_createHybrid'),
+    createPartial = require('./_createPartial'),
     getData = require('./_getData'),
     mergeData = require('./_mergeData'),
     setData = require('./_setData'),
+    setWrapToString = require('./_setWrapToString'),
     toInteger = require('./toInteger');
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
-/** Used to compose bitmasks for wrapper metadata. */
+/** Used to compose bitmasks for function metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
     CURRY_FLAG = 8,
@@ -28,7 +29,7 @@ var nativeMax = Math.max;
  *
  * @private
  * @param {Function|string} func The function or method name to wrap.
- * @param {number} bitmask The bitmask of wrapper flags.
+ * @param {number} bitmask The bitmask flags.
  *  The bitmask may be composed of the following flags:
  *     1 - `_.bind`
  *     2 - `_.bindKey`
@@ -39,6 +40,7 @@ var nativeMax = Math.max;
  *    64 - `_.partialRight`
  *   128 - `_.rearg`
  *   256 - `_.ary`
+ *   512 - `_.flip`
  * @param {*} [thisArg] The `this` binding of `func`.
  * @param {Array} [partials] The arguments to be partially applied.
  * @param {Array} [holders] The `partials` placeholder indexes.
@@ -47,7 +49,7 @@ var nativeMax = Math.max;
  * @param {number} [arity] The arity of `func`.
  * @returns {Function} Returns the new wrapped function.
  */
-function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
+function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
   var isBindKey = bitmask & BIND_KEY_FLAG;
   if (!isBindKey && typeof func != 'function') {
     throw new TypeError(FUNC_ERROR_TEXT);
@@ -90,16 +92,16 @@ function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, a
     bitmask &= ~(CURRY_FLAG | CURRY_RIGHT_FLAG);
   }
   if (!bitmask || bitmask == BIND_FLAG) {
-    var result = createBaseWrapper(func, bitmask, thisArg);
+    var result = createBind(func, bitmask, thisArg);
   } else if (bitmask == CURRY_FLAG || bitmask == CURRY_RIGHT_FLAG) {
-    result = createCurryWrapper(func, bitmask, arity);
+    result = createCurry(func, bitmask, arity);
   } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !holders.length) {
-    result = createPartialWrapper(func, bitmask, thisArg, partials);
+    result = createPartial(func, bitmask, thisArg, partials);
   } else {
-    result = createHybridWrapper.apply(undefined, newData);
+    result = createHybrid.apply(undefined, newData);
   }
   var setter = data ? baseSetData : setData;
-  return setter(result, newData);
+  return setWrapToString(setter(result, newData), func, bitmask);
 }
 
-module.exports = createWrapper;
+module.exports = createWrap;

_deburrLetter.js

@@ -1,3 +1,5 @@
+var basePropertyOf = require('./_basePropertyOf');
+
 /** Used to map latin-1 supplementary letters to basic latin letters. */
 var deburredLetters = {
   '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
@@ -26,8 +28,6 @@ var deburredLetters = {
  * @param {string} letter The matched letter to deburr.
  * @returns {string} Returns the deburred letter.
  */
-function deburrLetter(letter) {
-  return deburredLetters[letter];
-}
+var deburrLetter = basePropertyOf(deburredLetters);
 
 module.exports = deburrLetter;

_defineProperty.js

@@ -0,0 +1,11 @@
+var getNative = require('./_getNative');
+
+/* Used to set `toString` methods. */
+var defineProperty = (function() {
+  var func = getNative(Object, 'defineProperty'),
+      name = getNative.name;
+
+  return (name && name.length > 2) ? func : undefined;
+}());
+
+module.exports = defineProperty;

_equalArrays.js

@@ -1,4 +1,5 @@
-var arraySome = require('./_arraySome');
+var SetCache = require('./_SetCache'),
+    arraySome = require('./_arraySome');
 
 /** Used to compose bitmasks for comparison styles. */
 var UNORDERED_COMPARE_FLAG = 1,
@@ -19,9 +20,7 @@ var UNORDERED_COMPARE_FLAG = 1,
  * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
  */
 function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
-  var index = -1,
-      isPartial = bitmask & PARTIAL_COMPARE_FLAG,
-      isUnordered = bitmask & UNORDERED_COMPARE_FLAG,
+  var isPartial = bitmask & PARTIAL_COMPARE_FLAG,
       arrLength = array.length,
       othLength = other.length;
 
@@ -30,11 +29,15 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
   }
   // Assume cyclic values are equal.
   var stacked = stack.get(array);
-  if (stacked) {
+  if (stacked && stack.get(other)) {
     return stacked == other;
   }
-  var result = true;
+  var index = -1,
+      result = true,
+      seen = (bitmask & UNORDERED_COMPARE_FLAG) ? new SetCache : undefined;
+
   stack.set(array, other);
+  stack.set(other, array);
 
   // Ignore non-index properties.
   while (++index < arrLength) {
@@ -54,10 +57,12 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
       break;
     }
     // Recursively compare arrays (susceptible to call stack limits).
-    if (isUnordered) {
-      if (!arraySome(other, function(othValue) {
-            return arrValue === othValue ||
-              equalFunc(arrValue, othValue, customizer, bitmask, stack);
+    if (seen) {
+      if (!arraySome(other, function(othValue, othIndex) {
+            if (!seen.has(othIndex) &&
+                (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
+              return seen.add(othIndex);
+            }
           })) {
         result = false;
         break;
@@ -71,6 +76,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](array);
+  stack['delete'](other);
   return result;
 }
 

_equalByTag.js

@@ -1,5 +1,6 @@
 var Symbol = require('./_Symbol'),
     Uint8Array = require('./_Uint8Array'),
+    eq = require('./eq'),
     equalArrays = require('./_equalArrays'),
     mapToArray = require('./_mapToArray'),
     setToArray = require('./_setToArray');
@@ -63,22 +64,18 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
 
     case boolTag:
     case dateTag:
-      // Coerce dates and booleans to numbers, dates to milliseconds and
-      // booleans to `1` or `0` treating invalid dates coerced to `NaN` as
-      // not equal.
-      return +object == +other;
+    case numberTag:
+      // Coerce booleans to `1` or `0` and dates to milliseconds.
+      // Invalid dates are coerced to `NaN`.
+      return eq(+object, +other);
 
     case errorTag:
       return object.name == other.name && object.message == other.message;
 
-    case numberTag:
-      // Treat `NaN` vs. `NaN` as equal.
-      return (object != +object) ? other != +other : object == +other;
-
     case regexpTag:
     case stringTag:
       // Coerce regexes to strings and treat strings, primitives and objects,
-      // as equal. See http://www.ecma-international.org/ecma-262/6.0/#sec-regexp.prototype.tostring
+      // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
       // for more details.
       return object == (other + '');
 
@@ -98,10 +95,12 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
         return stacked == other;
       }
       bitmask |= UNORDERED_COMPARE_FLAG;
-      stack.set(object, other);
 
       // Recursively compare objects (susceptible to call stack limits).
-      return equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask, stack);
+      stack.set(object, other);
+      var result = equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask, stack);
+      stack['delete'](object);
+      return result;
 
     case symbolTag:
       if (symbolValueOf) {

_equalObjects.js

@@ -1,9 +1,14 @@
-var baseHas = require('./_baseHas'),
-    keys = require('./keys');
+var keys = require('./keys');
 
 /** Used to compose bitmasks for comparison styles. */
 var PARTIAL_COMPARE_FLAG = 2;
 
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
 /**
  * A specialized version of `baseIsEqualDeep` for objects with support for
  * partial deep comparisons.
@@ -31,17 +36,18 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
   var index = objLength;
   while (index--) {
     var key = objProps[index];
-    if (!(isPartial ? key in other : baseHas(other, key))) {
+    if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
       return false;
     }
   }
   // Assume cyclic values are equal.
   var stacked = stack.get(object);
-  if (stacked) {
+  if (stacked && stack.get(other)) {
     return stacked == other;
   }
   var result = true;
   stack.set(object, other);
+  stack.set(other, object);
 
   var skipCtor = isPartial;
   while (++index < objLength) {
@@ -77,6 +83,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](object);
+  stack['delete'](other);
   return result;
 }