Bump to v4.16.1.

README.md

@@ -1,10 +1,10 @@
-# lodash-es v4.14.0
+# lodash-es v4.16.1
 
 The [Lodash](https://lodash.com/) library exported as [ES](http://www.ecma-international.org/ecma-262/6.0/) modules.
 
 Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
-```bash
+```shell
 $ lodash modularize exports=es -o ./
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.14.0-es) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.16.1-es) for more details.

_Reflect.js

@@ -1,6 +0,0 @@
-import root from './_root.js';
-
-/** Built-in value references. */
-var Reflect = root.Reflect;
-
-export default Reflect;

_Stack.js

@@ -13,7 +13,8 @@ import stackSet from './_stackSet.js';
  * @param {Array} [entries] The key-value pairs to cache.
  */
 function Stack(entries) {
-  this.__data__ = new ListCache(entries);
+  var data = this.__data__ = new ListCache(entries);
+  this.size = data.size;
 }
 
 // Add methods to `Stack`.

_arrayIncludes.js

@@ -5,7 +5,7 @@ import baseIndexOf from './_baseIndexOf.js';
  * specifying an index to search from.
  *
  * @private
- * @param {Array} [array] The array to search.
+ * @param {Array} [array] The array to inspect.
  * @param {*} target The value to search for.
  * @returns {boolean} Returns `true` if `target` is found, else `false`.
  */

_arrayIncludesWith.js

@@ -2,7 +2,7 @@
  * 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 inspect.
  * @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`.

_arrayLikeKeys.js

@@ -0,0 +1,39 @@
+import baseTimes from './_baseTimes.js';
+import isArguments from './isArguments.js';
+import isArray from './isArray.js';
+import isIndex from './_isIndex.js';
+
+/** 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) {
+  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
+  // Safari 9 makes `arguments.length` enumerable in strict mode.
+  var result = (isArray(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;
+}
+
+export default arrayLikeKeys;

_arraySample.js

@@ -0,0 +1,16 @@
+import baseRandom from './_baseRandom.js';
+
+/**
+ * A specialized version of `_.sample` for arrays without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @returns {*} Returns the random element.
+ */
+function arraySample(array) {
+  var length = array.length;
+  return length ? array[baseRandom(0, length - 1)] : undefined;
+}
+
+export default arraySample;

_arraySampleSize.js

@@ -0,0 +1,18 @@
+import arrayShuffle from './_arrayShuffle.js';
+import baseClamp from './_baseClamp.js';
+
+/**
+ * A specialized version of `_.sampleSize` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @param {number} n The number of elements to sample.
+ * @returns {Array} Returns the random elements.
+ */
+function arraySampleSize(array, n) {
+  var result = arrayShuffle(array);
+  result.length = baseClamp(n, 0, result.length);
+  return result;
+}
+
+export default arraySampleSize;

_arrayShuffle.js

@@ -0,0 +1,15 @@
+import copyArray from './_copyArray.js';
+import shuffleSelf from './_shuffleSelf.js';
+
+/**
+ * A specialized version of `_.shuffle` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+function arrayShuffle(array) {
+  return shuffleSelf(copyArray(array));
+}
+
+export default arrayShuffle;

_asciiSize.js

@@ -0,0 +1,12 @@
+import baseProperty from './_baseProperty.js';
+
+/**
+ * Gets the size of an ASCII `string`.
+ *
+ * @private
+ * @param {string} string The string inspect.
+ * @returns {number} Returns the string size.
+ */
+var asciiSize = baseProperty('length');
+
+export default asciiSize;

_asciiToArray.js

@@ -0,0 +1,12 @@
+/**
+ * Converts an ASCII `string` to an array.
+ *
+ * @private
+ * @param {string} string The string to convert.
+ * @returns {Array} Returns the converted array.
+ */
+function asciiToArray(string) {
+  return string.split('');
+}
+
+export default asciiToArray;

_asciiWords.js

@@ -0,0 +1,15 @@
+/** Used to match words composed of alphanumeric characters. */
+var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
+
+/**
+ * Splits an ASCII `string` into an array of its words.
+ *
+ * @private
+ * @param {string} The string to inspect.
+ * @returns {Array} Returns the words of `string`.
+ */
+function asciiWords(string) {
+  return string.match(reAsciiWord) || [];
+}
+
+export default asciiWords;

_assignMergeValue.js

@@ -1,3 +1,4 @@
+import baseAssignValue from './_baseAssignValue.js';
 import eq from './eq.js';
 
 /**
@@ -12,7 +13,7 @@ import eq from './eq.js';
 function assignMergeValue(object, key, value) {
   if ((value !== undefined && !eq(object[key], value)) ||
       (typeof key == 'number' && value === undefined && !(key in object))) {
-    object[key] = value;
+    baseAssignValue(object, key, value);
   }
 }
 

_assignValue.js

@@ -1,3 +1,4 @@
+import baseAssignValue from './_baseAssignValue.js';
 import eq from './eq.js';
 
 /** Used for built-in method references. */
@@ -8,7 +9,7 @@ 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
@@ -20,7 +21,7 @@ function assignValue(object, key, value) {
   var objValue = object[key];
   if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
       (value === undefined && !(key in object))) {
-    object[key] = value;
+    baseAssignValue(object, key, value);
   }
 }
 

_assocIndexOf.js

@@ -4,7 +4,7 @@ import eq from './eq.js';
  * Gets the index at which the `key` is found in `array` of key-value pairs.
  *
  * @private
- * @param {Array} array The array to search.
+ * @param {Array} array The array to inspect.
  * @param {*} key The key to search for.
  * @returns {number} Returns the index of the matched value, else `-1`.
  */

_baseAssignValue.js

@@ -0,0 +1,26 @@
+/** Built-in value references. */
+var defineProperty = Object.defineProperty;
+
+/**
+ * The base implementation of `assignValue` and `assignMergeValue` without
+ * value checks.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function baseAssignValue(object, key, value) {
+  if (key == '__proto__' && defineProperty) {
+    defineProperty(object, key, {
+      'configurable': true,
+      'enumerable': true,
+      'value': value,
+      'writable': true
+    });
+  } else {
+    object[key] = value;
+  }
+}
+
+export default baseAssignValue;

_baseClone.js

@@ -12,7 +12,6 @@ import initCloneByTag from './_initCloneByTag.js';
 import initCloneObject from './_initCloneObject.js';
 import isArray from './isArray.js';
 import isBuffer from './isBuffer.js';
-import isHostObject from './_isHostObject.js';
 import isObject from './isObject.js';
 import keys from './keys.js';
 
@@ -100,9 +99,6 @@ function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
       return cloneBuffer(value, isDeep);
     }
     if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
-      if (isHostObject(value)) {
-        return object ? value : {};
-      }
       result = initCloneObject(isFunc ? {} : value);
       if (!isDeep) {
         return copySymbols(value, baseAssign(result, value));
@@ -133,9 +129,6 @@ function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
     // Recursively populate clone (susceptible to call stack limits).
     assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));
   });
-  if (!isFull) {
-    stack['delete'](value);
-  }
   return result;
 }
 

_baseConformsTo.js

@@ -11,14 +11,13 @@ function baseConformsTo(object, source, props) {
   if (object == null) {
     return !length;
   }
-  var index = length;
-  while (index--) {
-    var key = props[index],
+  object = Object(object);
+  while (length--) {
+    var key = props[length],
         predicate = source[key],
         value = object[key];
 
-    if ((value === undefined &&
-        !(key in Object(object))) || !predicate(value)) {
+    if ((value === undefined && !(key in object)) || !predicate(value)) {
       return false;
     }
   }

_baseDelay.js

@@ -9,7 +9,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @param {Function} func The function to delay.
  * @param {number} wait The number of milliseconds to delay invocation.
  * @param {Array} args The arguments to provide to `func`.
- * @returns {number} Returns the timer id.
+ * @returns {number|Object} Returns the timer id or timeout object.
  */
 function baseDelay(func, wait, args) {
   if (typeof func != 'function') {

_baseFindIndex.js

@@ -3,7 +3,7 @@
  * support for iteratee shorthands.
  *
  * @private
- * @param {Array} array The array to search.
+ * @param {Array} array The array to inspect.
  * @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.

_baseFindKey.js

@@ -4,7 +4,7 @@
  * using `eachFunc`.
  *
  * @private
- * @param {Array|Object} collection The collection to search.
+ * @param {Array|Object} collection The collection to inspect.
  * @param {Function} predicate The function invoked per iteration.
  * @param {Function} eachFunc The function to iterate over `collection`.
  * @returns {*} Returns the found element or its key, else `undefined`.

_baseGetTag.js

@@ -3,7 +3,7 @@ var objectProto = Object.prototype;
 
 /**
  * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;

_baseHas.js

@@ -1,5 +1,3 @@
-import getPrototype from './_getPrototype.js';
-
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
@@ -15,12 +13,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * @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 object != null &&
-    (hasOwnProperty.call(object, key) ||
-      (typeof object == 'object' && key in object && getPrototype(object) === null));
+  return object != null && hasOwnProperty.call(object, key);
 }
 
 export default baseHas;

_baseIndexOf.js

@@ -1,28 +1,20 @@
 import baseFindIndex from './_baseFindIndex.js';
 import baseIsNaN from './_baseIsNaN.js';
+import strictIndexOf from './_strictIndexOf.js';
 
 /**
  * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
  *
  * @private
- * @param {Array} array The array to search.
+ * @param {Array} array The array to inspect.
  * @param {*} value The value to search for.
  * @param {number} fromIndex The index to search from.
  * @returns {number} Returns the index of the matched value, else `-1`.
  */
 function baseIndexOf(array, value, fromIndex) {
-  if (value !== value) {
-    return baseFindIndex(array, baseIsNaN, fromIndex);
-  }
-  var index = fromIndex - 1,
-      length = array.length;
-
-  while (++index < length) {
-    if (array[index] === value) {
-      return index;
-    }
-  }
-  return -1;
+  return value === value
+    ? strictIndexOf(array, value, fromIndex)
+    : baseFindIndex(array, baseIsNaN, fromIndex);
 }
 
 export default baseIndexOf;

_baseIndexOfWith.js

@@ -2,7 +2,7 @@
  * This function is like `baseIndexOf` except that it accepts a comparator.
  *
  * @private
- * @param {Array} array The array to search.
+ * @param {Array} array The array to inspect.
  * @param {*} value The value to search for.
  * @param {number} fromIndex The index to search from.
  * @param {Function} comparator The comparator invoked per element.

_baseIsArrayBuffer.js

@@ -7,7 +7,7 @@ var objectProto = Object.prototype;
 
 /**
  * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;

_baseIsDate.js

@@ -8,7 +8,7 @@ var objectProto = Object.prototype;
 
 /**
  * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;

_baseIsEqualDeep.js

@@ -4,7 +4,6 @@ import equalByTag from './_equalByTag.js';
 import equalObjects from './_equalObjects.js';
 import getTag from './_getTag.js';
 import isArray from './isArray.js';
-import isHostObject from './_isHostObject.js';
 import isTypedArray from './isTypedArray.js';
 
 /** Used to compose bitmasks for comparison styles. */
@@ -50,8 +49,8 @@ function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {
     othTag = getTag(other);
     othTag = othTag == argsTag ? objectTag : othTag;
   }
-  var objIsObj = objTag == objectTag && !isHostObject(object),
-      othIsObj = othTag == objectTag && !isHostObject(other),
+  var objIsObj = objTag == objectTag,
+      othIsObj = othTag == objectTag,
       isSameTag = objTag == othTag;
 
   if (isSameTag && !objIsObj) {

_baseIsNative.js

@@ -1,12 +1,11 @@
 import isFunction from './isFunction.js';
-import isHostObject from './_isHostObject.js';
 import isMasked from './_isMasked.js';
 import isObject from './isObject.js';
 import toSource from './_toSource.js';
 
 /**
  * Used to match `RegExp`
- * [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns).
+ * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
  */
 var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
 
@@ -14,10 +13,11 @@ var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
 var reIsHostCtor = /^\[object .+?Constructor\]$/;
 
 /** Used for built-in method references. */
-var objectProto = Object.prototype;
+var funcProto = Function.prototype,
+    objectProto = Object.prototype;
 
 /** Used to resolve the decompiled source of functions. */
-var funcToString = Function.prototype.toString;
+var funcToString = funcProto.toString;
 
 /** Used to check objects for own properties. */
 var hasOwnProperty = objectProto.hasOwnProperty;
@@ -40,7 +40,7 @@ function baseIsNative(value) {
   if (!isObject(value) || isMasked(value)) {
     return false;
   }
-  var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
+  var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
   return pattern.test(toSource(value));
 }
 

_baseIsRegExp.js

@@ -8,7 +8,7 @@ var objectProto = Object.prototype;
 
 /**
  * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;

_baseIsTypedArray.js

@@ -49,7 +49,7 @@ var objectProto = Object.prototype;
 
 /**
  * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;

_baseKeys.js

@@ -1,16 +1,30 @@
-import overArg from './_overArg.js';
+import isPrototype from './_isPrototype.js';
+import nativeKeys from './_nativeKeys.js';
 
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeKeys = Object.keys;
+/** 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.
  */
-var baseKeys = overArg(nativeKeys, Object);
+function baseKeys(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;
+}
 
 export default baseKeys;

_baseKeysIn.js

@@ -1,36 +1,33 @@
-import Reflect from './_Reflect.js';
-import iteratorToArray from './_iteratorToArray.js';
+import isObject from './isObject.js';
+import isPrototype from './_isPrototype.js';
+import nativeKeysIn from './_nativeKeysIn.js';
 
 /** 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));
-  };
-}
-
 export default baseKeysIn;

_baseMerge.js

@@ -1,11 +1,11 @@
 import Stack from './_Stack.js';
 import arrayEach from './_arrayEach.js';
 import assignMergeValue from './_assignMergeValue.js';
+import baseKeysIn from './_baseKeysIn.js';
 import baseMergeDeep from './_baseMergeDeep.js';
 import isArray from './isArray.js';
 import isObject from './isObject.js';
 import isTypedArray from './isTypedArray.js';
-import keysIn from './keysIn.js';
 
 /**
  * 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) {

_basePickBy.js

@@ -1,3 +1,5 @@
+import baseAssignValue from './_baseAssignValue.js';
+
 /**
  * The base implementation of  `_.pickBy` without support for iteratee shorthands.
  *
@@ -17,7 +19,7 @@ function basePickBy(object, props, predicate) {
         value = object[key];
 
     if (predicate(value, key)) {
-      result[key] = value;
+      baseAssignValue(result, key, value);
     }
   }
   return result;

_baseRest.js

@@ -1,7 +1,6 @@
-import apply from './_apply.js';
-
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeMax = Math.max;
+import identity from './identity.js';
+import overRest from './_overRest.js';
+import setToString from './_setToString.js';
 
 /**
  * The base implementation of `_.rest` which doesn't validate or coerce arguments.
@@ -12,24 +11,7 @@ var nativeMax = Math.max;
  * @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);
-  };
+  return setToString(overRest(func, start, identity), func + '');
 }
 
 export default baseRest;

_baseSet.js

@@ -9,13 +9,16 @@ import toKey from './_toKey.js';
  * The base implementation of `_.set`.
  *
  * @private
- * @param {Object} object The object to query.
+ * @param {Object} object The object to modify.
  * @param {Array|string} path The path of the property to set.
  * @param {*} value The value to set.
  * @param {Function} [customizer] The function to customize path creation.
  * @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;

_baseSetData.js

@@ -2,7 +2,7 @@ import identity from './identity.js';
 import metaMap from './_metaMap.js';
 
 /**
- * The base implementation of `setData` without support for hot loop detection.
+ * The base implementation of `setData` without support for hot loop shorting.
  *
  * @private
  * @param {Function} func The function to associate metadata with.

_baseSetToString.js

@@ -0,0 +1,22 @@
+import constant from './constant.js';
+import identity from './identity.js';
+import nativeDefineProperty from './_nativeDefineProperty.js';
+
+/**
+ * The base implementation of `setToString` without support for hot loop shorting.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The `toString` result.
+ * @returns {Function} Returns `func`.
+ */
+var baseSetToString = !nativeDefineProperty ? identity : function(func, string) {
+  return nativeDefineProperty(func, 'toString', {
+    'configurable': true,
+    'enumerable': false,
+    'value': constant(string),
+    'writable': true
+  });
+};
+
+export default baseSetToString;

_baseUnset.js

@@ -1,10 +1,15 @@
-import baseHas from './_baseHas.js';
 import castPath from './_castPath.js';
 import isKey from './_isKey.js';
 import last from './last.js';
 import parent from './_parent.js';
 import toKey from './_toKey.js';
 
+/** 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];
 }
 
 export default baseUnset;

_baseUpdate.js

@@ -5,7 +5,7 @@ import baseSet from './_baseSet.js';
  * The base implementation of `_.update`.
  *
  * @private
- * @param {Object} object The object to query.
+ * @param {Object} object The object to modify.
  * @param {Array|string} path The path of the property to update.
  * @param {Function} updater The function to produce the updated value.
  * @param {Function} [customizer] The function to customize path creation.

_cacheHas.js

@@ -1,5 +1,5 @@
 /**
- * Checks if a cache value for `key` exists.
+ * Checks if a `cache` value for `key` exists.
  *
  * @private
  * @param {Object} cache The cache to query.

_castRest.js

@@ -0,0 +1,14 @@
+import baseRest from './_baseRest.js';
+
+/**
+ * A `baseRest` alias which can be replaced with `identity` by module
+ * replacement plugins.
+ *
+ * @private
+ * @type {Function}
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+var castRest = baseRest;
+
+export default castRest;

_copyObject.js

@@ -1,4 +1,5 @@
 import assignValue from './_assignValue.js';
+import baseAssignValue from './_baseAssignValue.js';
 
 /**
  * Copies properties of `source` to `object`.
@@ -11,6 +12,7 @@ import assignValue from './_assignValue.js';
  * @returns {Object} Returns `object`.
  */
 function copyObject(source, props, object, customizer) {
+  var isNew = !object;
   object || (object = {});
 
   var index = -1,
@@ -23,7 +25,14 @@ function copyObject(source, props, object, customizer) {
       ? customizer(object[key], source[key], key, object, source)
       : undefined;
 
-    assignValue(object, key, newValue === undefined ? source[key] : newValue);
+    if (newValue === undefined) {
+      newValue = source[key];
+    }
+    if (isNew) {
+      baseAssignValue(object, key, newValue);
+    } else {
+      assignValue(object, key, newValue);
+    }
   }
   return object;
 }

_countHolders.js

@@ -12,7 +12,7 @@ function countHolders(array, placeholder) {
 
   while (length--) {
     if (array[length] === placeholder) {
-      result++;
+      ++result;
     }
   }
   return result;

_createCaseFirst.js

@@ -1,5 +1,5 @@
 import castSlice from './_castSlice.js';
-import reHasComplexSymbol from './_reHasComplexSymbol.js';
+import hasUnicode from './_hasUnicode.js';
 import stringToArray from './_stringToArray.js';
 import toString from './toString.js';
 
@@ -14,7 +14,7 @@ function createCaseFirst(methodName) {
   return function(string) {
     string = toString(string);
 
-    var strSymbols = reHasComplexSymbol.test(string)
+    var strSymbols = hasUnicode(string)
       ? stringToArray(string)
       : undefined;
 

_createCtor.js

@@ -12,7 +12,7 @@ import isObject from './isObject.js';
 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) {

_createFlow.js

@@ -1,6 +1,5 @@
 import LodashWrapper from './_LodashWrapper.js';
-import baseFlatten from './_baseFlatten.js';
-import baseRest from './_baseRest.js';
+import flatRest from './_flatRest.js';
 import getData from './_getData.js';
 import getFuncName from './_getFuncName.js';
 import isArray from './isArray.js';
@@ -26,9 +25,7 @@ var CURRY_FLAG = 8,
  * @returns {Function} Returns the new flow function.
  */
 function createFlow(fromRight) {
-  return baseRest(function(funcs) {
-    funcs = baseFlatten(funcs, 1);
-
+  return flatRest(function(funcs) {
     var length = funcs.length,
         index = length,
         prereq = LodashWrapper.prototype.thru;

_createOver.js

@@ -1,10 +1,9 @@
 import apply from './_apply.js';
 import arrayMap from './_arrayMap.js';
-import baseFlatten from './_baseFlatten.js';
 import baseIteratee from './_baseIteratee.js';
 import baseRest from './_baseRest.js';
 import baseUnary from './_baseUnary.js';
-import isArray from './isArray.js';
+import flatRest from './_flatRest.js';
 
 /**
  * Creates a function like `_.over`.
@@ -14,11 +13,8 @@ import isArray from './isArray.js';
  * @returns {Function} Returns the new over function.
  */
 function createOver(arrayFunc) {
-  return baseRest(function(iteratees) {
-    iteratees = (iteratees.length == 1 && isArray(iteratees[0]))
-      ? arrayMap(iteratees[0], baseUnary(baseIteratee))
-      : arrayMap(baseFlatten(iteratees, 1), baseUnary(baseIteratee));
-
+  return flatRest(function(iteratees) {
+    iteratees = arrayMap(iteratees, baseUnary(baseIteratee));
     return baseRest(function(args) {
       var thisArg = this;
       return arrayFunc(iteratees, function(iteratee) {

_createPadding.js

@@ -1,7 +1,7 @@
 import baseRepeat from './_baseRepeat.js';
 import baseToString from './_baseToString.js';
 import castSlice from './_castSlice.js';
-import reHasComplexSymbol from './_reHasComplexSymbol.js';
+import hasUnicode from './_hasUnicode.js';
 import stringSize from './_stringSize.js';
 import stringToArray from './_stringToArray.js';
 
@@ -25,7 +25,7 @@ function createPadding(length, chars) {
     return charsLength ? baseRepeat(chars, length) : chars;
   }
   var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
-  return reHasComplexSymbol.test(chars)
+  return hasUnicode(chars)
     ? castSlice(stringToArray(result), 0, length).join('')
     : result.slice(0, length);
 }

_createRange.js

@@ -1,6 +1,6 @@
 import baseRange from './_baseRange.js';
 import isIterateeCall from './_isIterateeCall.js';
-import toNumber from './toNumber.js';
+import toFinite from './toFinite.js';
 
 /**
  * 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);
   };
 }

_deburrLetter.js

@@ -1,15 +1,16 @@
 import basePropertyOf from './_basePropertyOf.js';
 
-/** Used to map latin-1 supplementary letters to basic latin letters. */
+/** Used to map Latin Unicode letters to basic Latin letters. */
 var deburredLetters = {
+  // Latin-1 Supplement block.
   '\xc0': 'A',  '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
   '\xe0': 'a',  '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
   '\xc7': 'C',  '\xe7': 'c',
   '\xd0': 'D',  '\xf0': 'd',
   '\xc8': 'E',  '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
   '\xe8': 'e',  '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
-  '\xcC': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
-  '\xeC': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
+  '\xcc': 'I',  '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
+  '\xec': 'i',  '\xed': 'i', '\xee': 'i', '\xef': 'i',
   '\xd1': 'N',  '\xf1': 'n',
   '\xd2': 'O',  '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
   '\xf2': 'o',  '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
@@ -18,11 +19,48 @@ var deburredLetters = {
   '\xdd': 'Y',  '\xfd': 'y', '\xff': 'y',
   '\xc6': 'Ae', '\xe6': 'ae',
   '\xde': 'Th', '\xfe': 'th',
-  '\xdf': 'ss'
+  '\xdf': 'ss',
+  // Latin Extended-A block.
+  '\u0100': 'A',  '\u0102': 'A', '\u0104': 'A',
+  '\u0101': 'a',  '\u0103': 'a', '\u0105': 'a',
+  '\u0106': 'C',  '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
+  '\u0107': 'c',  '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
+  '\u010e': 'D',  '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
+  '\u0112': 'E',  '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
+  '\u0113': 'e',  '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
+  '\u011c': 'G',  '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
+  '\u011d': 'g',  '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
+  '\u0124': 'H',  '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
+  '\u0128': 'I',  '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
+  '\u0129': 'i',  '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
+  '\u0134': 'J',  '\u0135': 'j',
+  '\u0136': 'K',  '\u0137': 'k', '\u0138': 'k',
+  '\u0139': 'L',  '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
+  '\u013a': 'l',  '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
+  '\u0143': 'N',  '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
+  '\u0144': 'n',  '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
+  '\u014c': 'O',  '\u014e': 'O', '\u0150': 'O',
+  '\u014d': 'o',  '\u014f': 'o', '\u0151': 'o',
+  '\u0154': 'R',  '\u0156': 'R', '\u0158': 'R',
+  '\u0155': 'r',  '\u0157': 'r', '\u0159': 'r',
+  '\u015a': 'S',  '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
+  '\u015b': 's',  '\u015d': 's', '\u015f': 's', '\u0161': 's',
+  '\u0162': 'T',  '\u0164': 'T', '\u0166': 'T',
+  '\u0163': 't',  '\u0165': 't', '\u0167': 't',
+  '\u0168': 'U',  '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
+  '\u0169': 'u',  '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
+  '\u0174': 'W',  '\u0175': 'w',
+  '\u0176': 'Y',  '\u0177': 'y', '\u0178': 'Y',
+  '\u0179': 'Z',  '\u017b': 'Z', '\u017d': 'Z',
+  '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
+  '\u0132': 'IJ', '\u0133': 'ij',
+  '\u0152': 'Oe', '\u0153': 'oe',
+  '\u0149': "'n", '\u017f': 's'
 };
 
 /**
- * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters.
+ * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
+ * letters to basic Latin letters.
  *
  * @private
  * @param {string} letter The matched letter to deburr.

_defineProperty.js

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

_equalArrays.js

@@ -1,5 +1,6 @@
 import SetCache from './_SetCache.js';
 import arraySome from './_arraySome.js';
+import cacheHas from './_cacheHas.js';
 
 /** Used to compose bitmasks for comparison styles. */
 var UNORDERED_COMPARE_FLAG = 1,
@@ -59,9 +60,9 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     // Recursively compare arrays (susceptible to call stack limits).
     if (seen) {
       if (!arraySome(other, function(othValue, othIndex) {
-            if (!seen.has(othIndex) &&
+            if (!cacheHas(seen, othIndex) &&
                 (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
-              return seen.add(othIndex);
+              return seen.push(othIndex);
             }
           })) {
         result = false;
@@ -76,6 +77,7 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](array);
+  stack['delete'](other);
   return result;
 }
 

_equalByTag.js

@@ -75,7 +75,7 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
     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 + '');
 

_equalObjects.js

@@ -1,9 +1,14 @@
-import baseHas from './_baseHas.js';
 import keys from './keys.js';
 
 /** 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.
@@ -31,7 +36,7 @@ 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;
     }
   }
@@ -78,6 +83,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
     }
   }
   stack['delete'](object);
+  stack['delete'](other);
   return result;
 }
 

_escapeHtmlChar.js

@@ -6,8 +6,7 @@ var htmlEscapes = {
   '<': '&lt;',
   '>': '&gt;',
   '"': '&quot;',
-  "'": '&#39;',
-  '`': '&#96;'
+  "'": '&#39;'
 };
 
 /**

_flatRest.js

@@ -0,0 +1,16 @@
+import flatten from './flatten.js';
+import overRest from './_overRest.js';
+import setToString from './_setToString.js';
+
+/**
+ * A specialized version of `baseRest` which flattens the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+function flatRest(func) {
+  return setToString(overRest(func, undefined, flatten), func + '');
+}
+
+export default flatRest;

_getLength.js

@@ -1,16 +0,0 @@
-import baseProperty from './_baseProperty.js';
-
-/**
- * Gets the "length" property value of `object`.
- *
- * **Note:** This function is used to avoid a
- * [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792) that affects
- * Safari on at least iOS 8.1-8.3 ARM64.
- *
- * @private
- * @param {Object} object The object to query.
- * @returns {*} Returns the "length" value.
- */
-var getLength = baseProperty('length');
-
-export default getLength;

_getPrototype.js

@@ -1,15 +1,6 @@
 import overArg from './_overArg.js';
 
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeGetPrototype = Object.getPrototypeOf;
-
-/**
- * Gets the `[[Prototype]]` of `value`.
- *
- * @private
- * @param {*} value The value to query.
- * @returns {null|Object} Returns the `[[Prototype]]`.
- */
-var getPrototype = overArg(nativeGetPrototype, Object);
+/** Built-in value references. */
+var getPrototype = overArg(Object.getPrototypeOf, Object);
 
 export default getPrototype;

_getSymbolsIn.js

@@ -1,6 +1,7 @@
 import arrayPush from './_arrayPush.js';
 import getPrototype from './_getPrototype.js';
 import getSymbols from './_getSymbols.js';
+import stubArray from './stubArray.js';
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeGetSymbols = Object.getOwnPropertySymbols;
@@ -13,7 +14,7 @@ var nativeGetSymbols = Object.getOwnPropertySymbols;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-var getSymbolsIn = !nativeGetSymbols ? getSymbols : function(object) {
+var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
   var result = [];
   while (object) {
     arrayPush(result, getSymbols(object));

_getTag.js

@@ -20,7 +20,7 @@ var objectProto = Object.prototype;
 
 /**
  * Used to resolve the
- * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;
@@ -41,8 +41,7 @@ var dataViewCtorString = toSource(DataView),
  */
 var getTag = baseGetTag;
 
-// Fallback for data views, maps, sets, and weak maps in IE 11,
-// for data views in Edge, and promises in Node.js.
+// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
 if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
     (Map && getTag(new Map) != mapTag) ||
     (Promise && getTag(Promise.resolve()) != promiseTag) ||

_hasPath.js

@@ -4,7 +4,6 @@ import isArray from './isArray.js';
 import isIndex from './_isIndex.js';
 import isKey from './_isKey.js';
 import isLength from './isLength.js';
-import isString from './isString.js';
 import toKey from './_toKey.js';
 
 /**
@@ -19,9 +18,9 @@ import toKey from './_toKey.js';
 function hasPath(object, path, hasFunc) {
   path = isKey(path, object) ? [path] : castPath(path);
 
-  var result,
-      index = -1,
-      length = path.length;
+  var index = -1,
+      length = path.length,
+      result = false;
 
   while (++index < length) {
     var key = toKey(path[index]);
@@ -30,12 +29,12 @@ function hasPath(object, path, hasFunc) {
     }
     object = object[key];
   }
-  if (result) {
+  if (result || ++index != length) {
     return result;
   }
-  var length = object ? object.length : 0;
+  length = object ? object.length : 0;
   return !!length && isLength(length) && isIndex(key, length) &&
-    (isArray(object) || isString(object) || isArguments(object));
+    (isArray(object) || isArguments(object));
 }
 
 export default hasPath;

_hasUnicode.js

@@ -8,6 +8,17 @@ var rsAstralRange = '\\ud800-\\udfff',
 var rsZWJ = '\\u200d';
 
 /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
-var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
+var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
 
-export default reHasComplexSymbol;
+/**
+ * Checks if `string` contains Unicode symbols.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {boolean} Returns `true` if a symbol is found, else `false`.
+ */
+function hasUnicode(string) {
+  return reHasUnicode.test(string);
+}
+
+export default hasUnicode;

_hasUnicodeWord.js

@@ -0,0 +1,15 @@
+/** Used to detect strings that need a more robust regexp to match words. */
+var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
+
+/**
+ * Checks if `string` contains a word composed of Unicode symbols.
+ *
+ * @private
+ * @param {string} string The string to inspect.
+ * @returns {boolean} Returns `true` if a word is found, else `false`.
+ */
+function hasUnicodeWord(string) {
+  return reHasUnicodeWord.test(string);
+}
+
+export default hasUnicodeWord;

_hashClear.js

@@ -9,6 +9,7 @@ import nativeCreate from './_nativeCreate.js';
  */
 function hashClear() {
   this.__data__ = nativeCreate ? nativeCreate(null) : {};
+  this.size = 0;
 }
 
 export default hashClear;

_hashDelete.js

@@ -9,7 +9,9 @@
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function hashDelete(key) {
-  return this.has(key) && delete this.__data__[key];
+  var result = this.has(key) && delete this.__data__[key];
+  this.size -= result ? 1 : 0;
+  return result;
 }
 
 export default hashDelete;

_hashSet.js

@@ -15,6 +15,7 @@ var HASH_UNDEFINED = '__lodash_hash_undefined__';
  */
 function hashSet(key, value) {
   var data = this.__data__;
+  this.size += this.has(key) ? 0 : 1;
   data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
   return this;
 }

_indexKeys.js

@@ -1,24 +0,0 @@
-import baseTimes from './_baseTimes.js';
-import isArguments from './isArguments.js';
-import isArray from './isArray.js';
-import isLength from './isLength.js';
-import isString from './isString.js';
-
-/**
- * Creates an array of index keys for `object` values of arrays,
- * `arguments` objects, and strings, otherwise `null` is returned.
- *
- * @private
- * @param {Object} object The object to query.
- * @returns {Array|null} Returns index keys, else `null`.
- */
-function indexKeys(object) {
-  var length = object ? object.length : undefined;
-  if (isLength(length) &&
-      (isArray(object) || isString(object) || isArguments(object))) {
-    return baseTimes(length, String);
-  }
-  return null;
-}
-
-export default indexKeys;

_insertWrapDetails.js

@@ -10,9 +10,11 @@ var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/;
  * @returns {string} Returns the modified source.
  */
 function insertWrapDetails(source, details) {
-  var length = details.length,
-      lastIndex = length - 1;
-
+  var length = details.length;
+  if (!length) {
+    return source;
+  }
+  var lastIndex = length - 1;
   details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
   details = details.join(length > 2 ? ', ' : ' ');
   return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');

_isFlattenable.js

@@ -14,7 +14,7 @@ var spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
  */
 function isFlattenable(value) {
   return isArray(value) || isArguments(value) ||
-    !!(spreadableSymbol && value && value[spreadableSymbol])
+    !!(spreadableSymbol && value && value[spreadableSymbol]);
 }
 
 export default isFlattenable;

_isHostObject.js

@@ -1,20 +0,0 @@
-/**
- * Checks if `value` is a host object in IE < 9.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
- */
-function isHostObject(value) {
-  // Many host objects are `Object` objects that can coerce to strings
-  // despite having improperly defined `toString` methods.
-  var result = false;
-  if (value != null && typeof value.toString != 'function') {
-    try {
-      result = !!(value + '');
-    } catch (e) {}
-  }
-  return result;
-}
-
-export default isHostObject;

_listCacheClear.js

@@ -7,6 +7,7 @@
  */
 function listCacheClear() {
   this.__data__ = [];
+  this.size = 0;
 }
 
 export default listCacheClear;

_listCacheDelete.js

@@ -28,6 +28,7 @@ function listCacheDelete(key) {
   } else {
     splice.call(data, index, 1);
   }
+  --this.size;
   return true;
 }
 

_listCacheSet.js

@@ -15,6 +15,7 @@ function listCacheSet(key, value) {
       index = assocIndexOf(data, key);
 
   if (index < 0) {
+    ++this.size;
     data.push([key, value]);
   } else {
     data[index][1] = value;

_mapCacheClear.js

@@ -10,6 +10,7 @@ import Map from './_Map.js';
  * @memberOf MapCache
  */
 function mapCacheClear() {
+  this.size = 0;
   this.__data__ = {
     'hash': new Hash,
     'map': new (Map || ListCache),

_mapCacheDelete.js

@@ -10,7 +10,9 @@ import getMapData from './_getMapData.js';
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function mapCacheDelete(key) {
-  return getMapData(this, key)['delete'](key);
+  var result = getMapData(this, key)['delete'](key);
+  this.size -= result ? 1 : 0;
+  return result;
 }
 
 export default mapCacheDelete;

_mapCacheSet.js

@@ -11,7 +11,11 @@ import getMapData from './_getMapData.js';
  * @returns {Object} Returns the map cache instance.
  */
 function mapCacheSet(key, value) {
-  getMapData(this, key).set(key, value);
+  var data = getMapData(this, key),
+      size = data.size;
+
+  data.set(key, value);
+  this.size += data.size == size ? 0 : 1;
   return this;
 }
 

_memoizeCapped.js

@@ -0,0 +1,26 @@
+import memoize from './memoize.js';
+
+/** Used as the maximum memoize cache size. */
+var MAX_MEMOIZE_SIZE = 500;
+
+/**
+ * A specialized version of `_.memoize` which clears the memoized function's
+ * cache when it exceeds `MAX_MEMOIZE_SIZE`.
+ *
+ * @private
+ * @param {Function} func The function to have its output memoized.
+ * @returns {Function} Returns the new memoized function.
+ */
+function memoizeCapped(func) {
+  var result = memoize(func, function(key) {
+    if (cache.size === MAX_MEMOIZE_SIZE) {
+      cache.clear();
+    }
+    return key;
+  });
+
+  var cache = result.cache;
+  return result;
+}
+
+export default memoizeCapped;

_nativeDefineProperty.js

@@ -0,0 +1,6 @@
+import getNative from './_getNative.js';
+
+/* Built-in method references that are verified to be native. */
+var nativeDefineProperty = getNative(Object, 'defineProperty');
+
+export default nativeDefineProperty;

_nativeKeys.js

@@ -0,0 +1,6 @@
+import overArg from './_overArg.js';
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeKeys = overArg(Object.keys, Object);
+
+export default nativeKeys;

_nativeKeysIn.js

@@ -0,0 +1,20 @@
+/**
+ * This function is like
+ * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
+ * except that it includes inherited enumerable properties.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of property names.
+ */
+function nativeKeysIn(object) {
+  var result = [];
+  if (object != null) {
+    for (var key in Object(object)) {
+      result.push(key);
+    }
+  }
+  return result;
+}
+
+export default nativeKeysIn;

_nodeUtil.js

@@ -1,10 +1,10 @@
 import freeGlobal from './_freeGlobal.js';
 
 /** Detect free variable `exports`. */
-var freeExports = freeGlobal && typeof exports == 'object' && exports;
+var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
 
 /** Detect free variable `module`. */
-var freeModule = freeExports && typeof module == 'object' && module;
+var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
 
 /** Detect the popular CommonJS extension `module.exports`. */
 var moduleExports = freeModule && freeModule.exports === freeExports;

_overArg.js

@@ -1,5 +1,5 @@
 /**
- * Creates a function that invokes `func` with its first argument transformed.
+ * Creates a unary function that invokes `func` with its argument transformed.
  *
  * @private
  * @param {Function} func The function to wrap.

_overRest.js

@@ -0,0 +1,36 @@
+import apply from './_apply.js';
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * A specialized version of `baseRest` which transforms the rest array.
+ *
+ * @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.
+ * @param {Function} transform The rest array transform.
+ * @returns {Function} Returns the new function.
+ */
+function overRest(func, start, transform) {
+  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] = transform(array);
+    return apply(func, this, otherArgs);
+  };
+}
+
+export default overRest;

_setData.js

@@ -1,9 +1,5 @@
 import baseSetData from './_baseSetData.js';
-import now from './now.js';
-
-/** Used to detect hot functions by number of calls within a span of milliseconds. */
-var HOT_COUNT = 150,
-    HOT_SPAN = 16;
+import shortOut from './_shortOut.js';
 
 /**
  * Sets metadata for `func`.
@@ -19,24 +15,6 @@ var HOT_COUNT = 150,
  * @param {*} data The metadata.
  * @returns {Function} Returns `func`.
  */
-var setData = (function() {
-  var count = 0,
-      lastCalled = 0;
-
-  return function(key, value) {
-    var stamp = now(),
-        remaining = HOT_SPAN - (stamp - lastCalled);
-
-    lastCalled = stamp;
-    if (remaining > 0) {
-      if (++count >= HOT_COUNT) {
-        return key;
-      }
-    } else {
-      count = 0;
-    }
-    return baseSetData(key, value);
-  };
-}());
+var setData = shortOut(baseSetData);
 
 export default setData;

_setToString.js

@@ -0,0 +1,14 @@
+import baseSetToString from './_baseSetToString.js';
+import shortOut from './_shortOut.js';
+
+/**
+ * Sets the `toString` method of `func` to return `string`.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The `toString` result.
+ * @returns {Function} Returns `func`.
+ */
+var setToString = shortOut(baseSetToString);
+
+export default setToString;

_setWrapToString.js

@@ -1,8 +1,6 @@
-import constant from './constant.js';
-import defineProperty from './_defineProperty.js';
 import getWrapDetails from './_getWrapDetails.js';
-import identity from './identity.js';
 import insertWrapDetails from './_insertWrapDetails.js';
+import setToString from './_setToString.js';
 import updateWrapDetails from './_updateWrapDetails.js';
 
 /**
@@ -15,13 +13,9 @@ import updateWrapDetails from './_updateWrapDetails.js';
  * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @returns {Function} Returns `wrapper`.
  */
-var setWrapToString = !defineProperty ? identity : function(wrapper, reference, bitmask) {
+function setWrapToString(wrapper, reference, bitmask) {
   var source = (reference + '');
-  return defineProperty(wrapper, 'toString', {
-    'configurable': true,
-    'enumerable': false,
-    'value': constant(insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)))
-  });
-};
+  return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+}
 
 export default setWrapToString;

_shortOut.js

@@ -0,0 +1,37 @@
+/** Used to detect hot functions by number of calls within a span of milliseconds. */
+var HOT_COUNT = 500,
+    HOT_SPAN = 16;
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeNow = Date.now;
+
+/**
+ * Creates a function that'll short out and invoke `identity` instead
+ * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
+ * milliseconds.
+ *
+ * @private
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new shortable function.
+ */
+function shortOut(func) {
+  var count = 0,
+      lastCalled = 0;
+
+  return function() {
+    var stamp = nativeNow(),
+        remaining = HOT_SPAN - (stamp - lastCalled);
+
+    lastCalled = stamp;
+    if (remaining > 0) {
+      if (++count >= HOT_COUNT) {
+        return arguments[0];
+      }
+    } else {
+      count = 0;
+    }
+    return func.apply(undefined, arguments);
+  };
+}
+
+export default shortOut;

_shuffleSelf.js

@@ -0,0 +1,25 @@
+import baseRandom from './_baseRandom.js';
+
+/**
+ * A specialized version of `arrayShuffle` which mutates `array`.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @returns {Array} Returns `array`.
+ */
+function shuffleSelf(array) {
+  var index = -1,
+      length = array.length,
+      lastIndex = length - 1;
+
+  while (++index < length) {
+    var rand = baseRandom(index, lastIndex),
+        value = array[rand];
+
+    array[rand] = array[index];
+    array[index] = value;
+  }
+  return array;
+}
+
+export default shuffleSelf;

_stackClear.js

@@ -9,6 +9,7 @@ import ListCache from './_ListCache.js';
  */
 function stackClear() {
   this.__data__ = new ListCache;
+  this.size = 0;
 }
 
 export default stackClear;

_stackDelete.js

@@ -8,7 +8,11 @@
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function stackDelete(key) {
-  return this.__data__['delete'](key);
+  var data = this.__data__,
+      result = data['delete'](key);
+
+  this.size = data.size;
+  return result;
 }
 
 export default stackDelete;

_stackSet.js

@@ -16,16 +16,18 @@ var LARGE_ARRAY_SIZE = 200;
  * @returns {Object} Returns the stack cache instance.
  */
 function stackSet(key, value) {
-  var cache = this.__data__;
-  if (cache instanceof ListCache) {
-    var pairs = cache.__data__;
+  var data = this.__data__;
+  if (data instanceof ListCache) {
+    var pairs = data.__data__;
     if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
       pairs.push([key, value]);
+      this.size = ++data.size;
       return this;
     }
-    cache = this.__data__ = new MapCache(pairs);
+    data = this.__data__ = new MapCache(pairs);
   }
-  cache.set(key, value);
+  data.set(key, value);
+  this.size = data.size;
   return this;
 }
 

_strictIndexOf.js

@@ -0,0 +1,23 @@
+/**
+ * A specialized version of `_.indexOf` which performs strict equality
+ * comparisons of values, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function strictIndexOf(array, value, fromIndex) {
+  var index = fromIndex - 1,
+      length = array.length;
+
+  while (++index < length) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+export default strictIndexOf;

_strictLastIndexOf.js

@@ -0,0 +1,21 @@
+/**
+ * A specialized version of `_.lastIndexOf` which performs strict equality
+ * comparisons of values, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function strictLastIndexOf(array, value, fromIndex) {
+  var index = fromIndex + 1;
+  while (index--) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return index;
+}
+
+export default strictLastIndexOf;

_stringSize.js

@@ -1,30 +1,6 @@
-import reHasComplexSymbol from './_reHasComplexSymbol.js';
-
-/** Used to compose unicode character classes. */
-var rsAstralRange = '\\ud800-\\udfff',
-    rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
-    rsComboSymbolsRange = '\\u20d0-\\u20f0',
-    rsVarRange = '\\ufe0e\\ufe0f';
-
-/** Used to compose unicode capture groups. */
-var rsAstral = '[' + rsAstralRange + ']',
-    rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']',
-    rsFitz = '\\ud83c[\\udffb-\\udfff]',
-    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
-    rsNonAstral = '[^' + rsAstralRange + ']',
-    rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
-    rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
-    rsZWJ = '\\u200d';
-
-/** Used to compose unicode regexes. */
-var reOptMod = rsModifier + '?',
-    rsOptVar = '[' + rsVarRange + ']?',
-    rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
-    rsSeq = rsOptVar + reOptMod + rsOptJoin,
-    rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
-
-/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
-var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
+import asciiSize from './_asciiSize.js';
+import hasUnicode from './_hasUnicode.js';
+import unicodeSize from './_unicodeSize.js';
 
 /**
  * Gets the number of symbols in `string`.
@@ -34,14 +10,9 @@ var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq,
  * @returns {number} Returns the string size.
  */
 function stringSize(string) {
-  if (!(string && reHasComplexSymbol.test(string))) {
-    return string.length;
-  }
-  var result = reComplexSymbol.lastIndex = 0;
-  while (reComplexSymbol.test(string)) {
-    result++;
-  }
-  return result;
+  return hasUnicode(string)
+    ? unicodeSize(string)
+    : asciiSize(string);
 }
 
 export default stringSize;

_stringToArray.js

@@ -1,28 +1,6 @@
-/** Used to compose unicode character classes. */
-var rsAstralRange = '\\ud800-\\udfff',
-    rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
-    rsComboSymbolsRange = '\\u20d0-\\u20f0',
-    rsVarRange = '\\ufe0e\\ufe0f';
-
-/** Used to compose unicode capture groups. */
-var rsAstral = '[' + rsAstralRange + ']',
-    rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']',
-    rsFitz = '\\ud83c[\\udffb-\\udfff]',
-    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
-    rsNonAstral = '[^' + rsAstralRange + ']',
-    rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
-    rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
-    rsZWJ = '\\u200d';
-
-/** Used to compose unicode regexes. */
-var reOptMod = rsModifier + '?',
-    rsOptVar = '[' + rsVarRange + ']?',
-    rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
-    rsSeq = rsOptVar + reOptMod + rsOptJoin,
-    rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
-
-/** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
-var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
+import asciiToArray from './_asciiToArray.js';
+import hasUnicode from './_hasUnicode.js';
+import unicodeToArray from './_unicodeToArray.js';
 
 /**
  * Converts `string` to an array.
@@ -32,7 +10,9 @@ var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq,
  * @returns {Array} Returns the converted array.
  */
 function stringToArray(string) {
-  return string.match(reComplexSymbol);
+  return hasUnicode(string)
+    ? unicodeToArray(string)
+    : asciiToArray(string);
 }
 
 export default stringToArray;

_stringToPath.js

@@ -1,8 +1,9 @@
-import memoize from './memoize.js';
+import memoizeCapped from './_memoizeCapped.js';
 import toString from './toString.js';
 
 /** Used to match property names within property paths. */
-var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(\.|\[\])(?:\4|$))/g;
+var reLeadingDot = /^\./,
+    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
 
 /** Used to match backslashes in property paths. */
 var reEscapeChar = /\\(\\)?/g;
@@ -14,9 +15,14 @@ var reEscapeChar = /\\(\\)?/g;
  * @param {string} string The string to convert.
  * @returns {Array} Returns the property path array.
  */
-var stringToPath = memoize(function(string) {
+var stringToPath = memoizeCapped(function(string) {
+  string = toString(string);
+
   var result = [];
-  toString(string).replace(rePropName, function(match, number, quote, string) {
+  if (reLeadingDot.test(string)) {
+    result.push('');
+  }
+  string.replace(rePropName, function(match, number, quote, string) {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;

_toSource.js

@@ -1,5 +1,8 @@
+/** Used for built-in method references. */
+var funcProto = Function.prototype;
+
 /** Used to resolve the decompiled source of functions. */
-var funcToString = Function.prototype.toString;
+var funcToString = funcProto.toString;
 
 /**
  * Converts `func` to its source code.

_unescapeHtmlChar.js

@@ -6,8 +6,7 @@ var htmlUnescapes = {
   '&lt;': '<',
   '&gt;': '>',
   '&quot;': '"',
-  '&#39;': "'",
-  '&#96;': '`'
+  '&#39;': "'"
 };
 
 /**