diff --git a/README.md b/README.md
index 76257256d..8fe8eace0 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash v4.7.1
+# lodash v4.8.0
 
 The [lodash](https://lodash.com/) library exported as [npm packages](https://www.npmjs.com/browse/keyword/lodash-modularized) per method.
 
diff --git a/lodash._stringtopath/README.md b/lodash._stringtopath/README.md
index f12bf6d84..7e76277e2 100644
--- a/lodash._stringtopath/README.md
+++ b/lodash._stringtopath/README.md
@@ -1,4 +1,4 @@
-# lodash._stringtopath v4.7.1
+# lodash._stringtopath v4.8.0
 
 The internal [lodash](https://lodash.com/) function `stringToPath` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var stringToPath = require('lodash._stringtopath');
 ```
 
-See the [package source](https://github.com/lodash/lodash/blob/4.7.1-npm-packages/lodash._stringtopath) for more details.
+See the [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash._stringtopath) for more details.
diff --git a/lodash._stringtopath/index.js b/lodash._stringtopath/index.js
index 4679af688..99b3b6b6c 100644
--- a/lodash._stringtopath/index.js
+++ b/lodash._stringtopath/index.js
@@ -1,11 +1,12 @@
 /**
- * lodash 4.7.1 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
  * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  */
+var baseToString = require('lodash._basetostring');
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
@@ -13,13 +14,9 @@ var FUNC_ERROR_TEXT = 'Expected a function';
 /** Used to stand-in for `undefined` hash values. */
 var HASH_UNDEFINED = '__lodash_hash_undefined__';
 
-/** Used as references for various `Number` constants. */
-var INFINITY = 1 / 0;
-
 /** `Object#toString` result references. */
 var funcTag = '[object Function]',
-    genTag = '[object GeneratorFunction]',
-    symbolTag = '[object Symbol]';
+    genTag = '[object GeneratorFunction]';
 
 /** Used to match property names within property paths. */
 var rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g;
@@ -128,95 +125,236 @@ var reIsNative = RegExp('^' +
 );
 
 /** Built-in value references. */
-var Symbol = root.Symbol,
-    splice = arrayProto.splice;
+var splice = arrayProto.splice;
 
 /* Built-in method references that are verified to be native. */
 var Map = getNative(root, 'Map'),
     nativeCreate = getNative(Object, 'create');
 
-/** Used to convert symbols to primitives and strings. */
-var symbolProto = Symbol ? Symbol.prototype : undefined,
-    symbolToString = symbolProto ? symbolProto.toString : undefined;
-
 /**
  * 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;
+
+  this.clear();
+  while (++index < length) {
+    var entry = entries[index];
+    this.set(entry[0], entry[1]);
+  }
+}
+
+/**
+ * Removes all key-value entries from the hash.
+ *
+ * @private
+ * @name clear
+ * @memberOf Hash
+ */
+function hashClear() {
+  this.__data__ = nativeCreate ? nativeCreate(null) : {};
+}
 
 /**
  * Removes `key` and its value from the hash.
  *
  * @private
+ * @name delete
+ * @memberOf Hash
  * @param {Object} hash The hash to modify.
  * @param {string} key The key of the value to remove.
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
-function hashDelete(hash, key) {
-  return hashHas(hash, key) && delete hash[key];
+function hashDelete(key) {
+  return this.has(key) && delete this.__data__[key];
 }
 
 /**
  * Gets the hash value for `key`.
  *
  * @private
- * @param {Object} hash The hash to query.
+ * @name get
+ * @memberOf Hash
  * @param {string} key The key of the value to get.
  * @returns {*} Returns the entry value.
  */
-function hashGet(hash, key) {
+function hashGet(key) {
+  var data = this.__data__;
   if (nativeCreate) {
-    var result = hash[key];
+    var result = data[key];
     return result === HASH_UNDEFINED ? undefined : result;
   }
-  return hasOwnProperty.call(hash, key) ? hash[key] : undefined;
+  return hasOwnProperty.call(data, key) ? data[key] : undefined;
 }
 
 /**
  * Checks if a hash value for `key` exists.
  *
  * @private
- * @param {Object} hash The hash to query.
+ * @name has
+ * @memberOf Hash
  * @param {string} key The key of the entry to check.
  * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
-function hashHas(hash, key) {
-  return nativeCreate ? hash[key] !== undefined : hasOwnProperty.call(hash, key);
+function hashHas(key) {
+  var data = this.__data__;
+  return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);
 }
 
 /**
  * Sets the hash `key` to `value`.
  *
  * @private
- * @param {Object} hash The hash to modify.
+ * @name set
+ * @memberOf Hash
  * @param {string} key The key of the value to set.
  * @param {*} value The value to set.
+ * @returns {Object} Returns the hash instance.
  */
-function hashSet(hash, key, value) {
-  hash[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+function hashSet(key, value) {
+  var data = this.__data__;
+  data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
+  return this;
 }
 
-// Avoid inheriting from `Object.prototype` when possible.
-Hash.prototype = nativeCreate ? nativeCreate(null) : objectProto;
+// Add methods to `Hash`.
+Hash.prototype.clear = hashClear;
+Hash.prototype['delete'] = hashDelete;
+Hash.prototype.get = hashGet;
+Hash.prototype.has = hashHas;
+Hash.prototype.set = hashSet;
+
+/**
+ * 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]);
+  }
+}
+
+/**
+ * Removes all key-value entries from the list cache.
+ *
+ * @private
+ * @name clear
+ * @memberOf ListCache
+ */
+function listCacheClear() {
+  this.__data__ = [];
+}
+
+/**
+ * Removes `key` and its value from the list cache.
+ *
+ * @private
+ * @name delete
+ * @memberOf ListCache
+ * @param {string} key The key of the value to remove.
+ * @returns {boolean} Returns `true` if the entry was removed, else `false`.
+ */
+function listCacheDelete(key) {
+  var data = this.__data__,
+      index = assocIndexOf(data, key);
+
+  if (index < 0) {
+    return false;
+  }
+  var lastIndex = data.length - 1;
+  if (index == lastIndex) {
+    data.pop();
+  } else {
+    splice.call(data, index, 1);
+  }
+  return true;
+}
+
+/**
+ * Gets the list cache value for `key`.
+ *
+ * @private
+ * @name get
+ * @memberOf ListCache
+ * @param {string} key The key of the value to get.
+ * @returns {*} Returns the entry value.
+ */
+function listCacheGet(key) {
+  var data = this.__data__,
+      index = assocIndexOf(data, key);
+
+  return index < 0 ? undefined : data[index][1];
+}
+
+/**
+ * Checks if a list cache value for `key` exists.
+ *
+ * @private
+ * @name has
+ * @memberOf ListCache
+ * @param {string} key The key of the entry to check.
+ * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
+ */
+function listCacheHas(key) {
+  return assocIndexOf(this.__data__, key) > -1;
+}
+
+/**
+ * Sets the list cache `key` to `value`.
+ *
+ * @private
+ * @name set
+ * @memberOf ListCache
+ * @param {string} key The key of the value to set.
+ * @param {*} value The value to set.
+ * @returns {Object} Returns the list cache instance.
+ */
+function listCacheSet(key, value) {
+  var data = this.__data__,
+      index = assocIndexOf(data, key);
+
+  if (index < 0) {
+    data.push([key, value]);
+  } else {
+    data[index][1] = value;
+  }
+  return this;
+}
+
+// Add methods to `ListCache`.
+ListCache.prototype.clear = listCacheClear;
+ListCache.prototype['delete'] = listCacheDelete;
+ListCache.prototype.get = listCacheGet;
+ListCache.prototype.has = listCacheHas;
+ListCache.prototype.set = listCacheSet;
 
 /**
  * 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]);
   }
 }
@@ -228,10 +366,10 @@ function MapCache(values) {
  * @name clear
  * @memberOf MapCache
  */
-function mapClear() {
+function mapCacheClear() {
   this.__data__ = {
     'hash': new Hash,
-    'map': Map ? new Map : [],
+    'map': new (Map || ListCache),
     'string': new Hash
   };
 }
@@ -245,12 +383,8 @@ function mapClear() {
  * @param {string} key The key of the value to remove.
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
-function mapDelete(key) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    return hashDelete(typeof key == 'string' ? data.string : data.hash, key);
-  }
-  return Map ? data.map['delete'](key) : assocDelete(data.map, key);
+function mapCacheDelete(key) {
+  return getMapData(this, key)['delete'](key);
 }
 
 /**
@@ -262,12 +396,8 @@ function mapDelete(key) {
  * @param {string} key The key of the value to get.
  * @returns {*} Returns the entry value.
  */
-function mapGet(key) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    return hashGet(typeof key == 'string' ? data.string : data.hash, key);
-  }
-  return Map ? data.map.get(key) : assocGet(data.map, key);
+function mapCacheGet(key) {
+  return getMapData(this, key).get(key);
 }
 
 /**
@@ -279,12 +409,8 @@ function mapGet(key) {
  * @param {string} key The key of the entry to check.
  * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  */
-function mapHas(key) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    return hashHas(typeof key == 'string' ? data.string : data.hash, key);
-  }
-  return Map ? data.map.has(key) : assocHas(data.map, key);
+function mapCacheHas(key) {
+  return getMapData(this, key).has(key);
 }
 
 /**
@@ -297,71 +423,17 @@ function mapHas(key) {
  * @param {*} value The value to set.
  * @returns {Object} Returns the map cache instance.
  */
-function mapSet(key, value) {
-  var data = this.__data__;
-  if (isKeyable(key)) {
-    hashSet(typeof key == 'string' ? data.string : data.hash, key, value);
-  } else if (Map) {
-    data.map.set(key, value);
-  } else {
-    assocSet(data.map, key, value);
-  }
+function mapCacheSet(key, value) {
+  getMapData(this, key).set(key, value);
   return this;
 }
 
 // Add methods to `MapCache`.
-MapCache.prototype.clear = mapClear;
-MapCache.prototype['delete'] = mapDelete;
-MapCache.prototype.get = mapGet;
-MapCache.prototype.has = mapHas;
-MapCache.prototype.set = mapSet;
-
-/**
- * Removes `key` and its value from the associative array.
- *
- * @private
- * @param {Array} array The array to modify.
- * @param {string} key The key of the value to remove.
- * @returns {boolean} Returns `true` if the entry was removed, else `false`.
- */
-function assocDelete(array, key) {
-  var index = assocIndexOf(array, key);
-  if (index < 0) {
-    return false;
-  }
-  var lastIndex = array.length - 1;
-  if (index == lastIndex) {
-    array.pop();
-  } else {
-    splice.call(array, index, 1);
-  }
-  return true;
-}
-
-/**
- * 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];
-}
-
-/**
- * Checks if an associative array value for `key` exists.
- *
- * @private
- * @param {Array} array The array 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 assocHas(array, key) {
-  return assocIndexOf(array, key) > -1;
-}
+MapCache.prototype.clear = mapCacheClear;
+MapCache.prototype['delete'] = mapCacheDelete;
+MapCache.prototype.get = mapCacheGet;
+MapCache.prototype.has = mapCacheHas;
+MapCache.prototype.set = mapCacheSet;
 
 /**
  * Gets the index at which the `key` is found in `array` of key-value pairs.
@@ -382,20 +454,18 @@ function assocIndexOf(array, key) {
 }
 
 /**
- * Sets the associative array `key` to `value`.
+ * Gets the data for `map`.
  *
  * @private
- * @param {Array} array The array to modify.
- * @param {string} key The key of the value to set.
- * @param {*} value The value to set.
+ * @param {Object} map The map to query.
+ * @param {string} key The reference key.
+ * @returns {*} Returns the map data.
  */
-function assocSet(array, key, value) {
-  var index = assocIndexOf(array, key);
-  if (index < 0) {
-    array.push([key, value]);
-  } else {
-    array[index][1] = value;
-  }
+function getMapData(map, key) {
+  var data = map.__data__;
+  return isKeyable(key)
+    ? data[typeof key == 'string' ? 'string' : 'hash']
+    : data.map;
 }
 
 /**
@@ -420,8 +490,9 @@ function getNative(object, key) {
  */
 function isKeyable(value) {
   var type = typeof value;
-  return type == 'number' || type == 'boolean' ||
-    (type == 'string' && value != '__proto__') || value == null;
+  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
+    ? (value !== '__proto__')
+    : (value === null);
 }
 
 /**
@@ -477,7 +548,7 @@ function toSource(func) {
  * @category Function
  * @param {Function} func The function to have its output memoized.
  * @param {Function} [resolver] The function to resolve the cache key.
- * @returns {Function} Returns the new memoizing function.
+ * @returns {Function} Returns the new memoized function.
  * @example
  *
  * var object = { 'a': 1, 'b': 2 };
@@ -617,34 +688,6 @@ function isObject(value) {
   return !!value && (type == 'object' || type == 'function');
 }
 
-/**
- * Checks if `value` is object-like. A value is object-like if it's not `null`
- * and has a `typeof` result of "object".
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
- * @example
- *
- * _.isObjectLike({});
- * // => true
- *
- * _.isObjectLike([1, 2, 3]);
- * // => true
- *
- * _.isObjectLike(_.noop);
- * // => false
- *
- * _.isObjectLike(null);
- * // => false
- */
-function isObjectLike(value) {
-  return !!value && typeof value == 'object';
-}
-
 /**
  * Checks if `value` is a native function.
  *
@@ -671,29 +714,6 @@ function isNative(value) {
   return pattern.test(toSource(value));
 }
 
-/**
- * Checks if `value` is classified as a `Symbol` primitive or object.
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is correctly classified,
- *  else `false`.
- * @example
- *
- * _.isSymbol(Symbol.iterator);
- * // => true
- *
- * _.isSymbol('abc');
- * // => false
- */
-function isSymbol(value) {
-  return typeof value == 'symbol' ||
-    (isObjectLike(value) && objectToString.call(value) == symbolTag);
-}
-
 /**
  * Converts `value` to a string. An empty string is returned for `null`
  * and `undefined` values. The sign of `-0` is preserved.
@@ -716,18 +736,7 @@ function isSymbol(value) {
  * // => '1,2,3'
  */
 function toString(value) {
-  // Exit early for strings to avoid a performance hit in some environments.
-  if (typeof value == 'string') {
-    return value;
-  }
-  if (value == null) {
-    return '';
-  }
-  if (isSymbol(value)) {
-    return symbolToString ? symbolToString.call(value) : '';
-  }
-  var result = (value + '');
-  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
+  return value == null ? '' : baseToString(value);
 }
 
 module.exports = stringToPath;
diff --git a/lodash._stringtopath/package.json b/lodash._stringtopath/package.json
index 5512080ee..e3cbd4968 100644
--- a/lodash._stringtopath/package.json
+++ b/lodash._stringtopath/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash._stringtopath",
-  "version": "4.7.1",
+  "version": "4.8.0",
   "description": "The internal lodash function `stringToPath` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -12,5 +12,8 @@
     "Mathias Bynens <mathias@qiwi.be> (https://mathiasbynens.be/)"
   ],
   "repository": "lodash/lodash",
-  "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" }
+  "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
+  "dependencies": {
+    "lodash._basetostring": "~4.12.0"
+  }
 }
diff --git a/lodash.differenceby/README.md b/lodash.differenceby/README.md
index e888b4d46..9d6db14b2 100644
--- a/lodash.differenceby/README.md
+++ b/lodash.differenceby/README.md
@@ -1,4 +1,4 @@
-# lodash.differenceby v4.7.1
+# lodash.differenceby v4.8.0
 
 The [lodash](https://lodash.com/) method `_.differenceBy` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var differenceBy = require('lodash.differenceby');
 ```
 
-See the [documentation](https://lodash.com/docs#differenceBy) or [package source](https://github.com/lodash/lodash/blob/4.7.1-npm-packages/lodash.differenceby) for more details.
+See the [documentation](https://lodash.com/docs#differenceBy) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.differenceby) for more details.
diff --git a/lodash.differenceby/index.js b/lodash.differenceby/index.js
index b1798ea75..0823ac56a 100644
--- a/lodash.differenceby/index.js
+++ b/lodash.differenceby/index.js
@@ -62,7 +62,7 @@ var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
 
 /**
  * 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;
 
@@ -147,7 +147,7 @@ function apply(func, thisArg, args) {
  * 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`.
  */
@@ -160,7 +160,7 @@ function arrayIncludes(array, value) {
  * 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`.
@@ -243,7 +243,7 @@ function arraySome(array, predicate) {
  * 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.
@@ -265,7 +265,7 @@ function baseFindIndex(array, predicate, fromIndex, fromRight) {
  * 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`.
@@ -402,7 +402,7 @@ function mapToArray(map) {
 }
 
 /**
- * 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.
@@ -434,6 +434,7 @@ function setToArray(set) {
 
 /** Used for built-in method references. */
 var arrayProto = Array.prototype,
+    funcProto = Function.prototype,
     objectProto = Object.prototype;
 
 /** Used to detect overreaching core-js shims. */
@@ -446,14 +447,14 @@ var maskSrcKey = (function() {
 }());
 
 /** 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;
 
 /**
  * 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;
@@ -472,8 +473,7 @@ var Symbol = root.Symbol,
     spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeGetPrototype = Object.getPrototypeOf,
-    nativeKeys = Object.keys,
+var nativeKeys = overArg(Object.keys, Object),
     nativeMax = Math.max;
 
 /* Built-in method references that are verified to be native. */
@@ -942,11 +942,38 @@ Stack.prototype.get = stackGet;
 Stack.prototype.has = stackHas;
 Stack.prototype.set = stackSet;
 
+/**
+ * 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;
+}
+
 /**
  * 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`.
  */
@@ -1081,23 +1108,6 @@ function baseGetTag(value) {
   return objectToString.call(value);
 }
 
-/**
- * The base implementation of `_.has` without support for deep paths.
- *
- * @private
- * @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 object != null &&
-    (hasOwnProperty.call(object, key) ||
-      (typeof object == 'object' && key in object && getPrototype(object) === null));
-}
-
 /**
  * The base implementation of `_.hasIn` without support for deep paths.
  *
@@ -1300,14 +1310,24 @@ function baseIteratee(value) {
 }
 
 /**
- * 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;
+}
 
 /**
  * The base implementation of `_.matches` which doesn't clone `source`.
@@ -1542,7 +1562,7 @@ 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 + '');
 
@@ -1604,7 +1624,7 @@ 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;
     }
   }
@@ -1655,19 +1675,6 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
   return result;
 }
 
-/**
- * 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');
-
 /**
  * Gets the data for `map`.
  *
@@ -1716,15 +1723,6 @@ function getNative(object, key) {
   return baseIsNative(value) ? value : undefined;
 }
 
-/**
- * Gets the `[[Prototype]]` of `value`.
- *
- * @private
- * @param {*} value The value to query.
- * @returns {null|Object} Returns the `[[Prototype]]`.
- */
-var getPrototype = overArg(nativeGetPrototype, Object);
-
 /**
  * Gets the `toStringTag` of `value`.
  *
@@ -1735,7 +1733,7 @@ var getPrototype = overArg(nativeGetPrototype, Object);
 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.
+// for data views in Edge < 14, and promises in Node.js.
 if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
     (Map && getTag(new Map) != mapTag) ||
     (Promise && getTag(Promise.resolve()) != promiseTag) ||
@@ -1787,24 +1785,7 @@ function hasPath(object, path, hasFunc) {
   }
   var length = object ? object.length : 0;
   return !!length && isLength(length) && isIndex(key, length) &&
-    (isArray(object) || isString(object) || isArguments(object));
-}
-
-/**
- * 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;
+    (isArray(object) || isArguments(object));
 }
 
 /**
@@ -2043,7 +2024,7 @@ function last(array) {
  * **Note:** The cache is exposed as the `cache` property on the memoized
  * function. Its creation may be customized by replacing the `_.memoize.Cache`
  * constructor with one whose instances implement the
- * [`Map`](http://ecma-international.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object)
+ * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
  * method interface of `delete`, `get`, `has`, and `set`.
  *
  * @static
@@ -2102,7 +2083,7 @@ memoize.Cache = MapCache;
 
 /**
  * Performs a
- * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  * comparison between two values to determine if they are equivalent.
  *
  * @static
@@ -2155,7 +2136,7 @@ function eq(value, other) {
  * // => false
  */
 function isArguments(value) {
-  // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
+  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
   return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
     (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
 }
@@ -2211,7 +2192,7 @@ var isArray = Array.isArray;
  * // => false
  */
 function isArrayLike(value) {
-  return value != null && isLength(getLength(value)) && !isFunction(value);
+  return value != null && isLength(value.length) && !isFunction(value);
 }
 
 /**
@@ -2262,8 +2243,7 @@ function isArrayLikeObject(value) {
  */
 function isFunction(value) {
   // The use of `Object#toString` avoids issues with the `typeof` operator
-  // in Safari 8 which returns 'object' for typed array and weak map constructors,
-  // and PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+  // in Safari 8-9 which returns 'object' for typed array and other constructors.
   var tag = isObject(value) ? objectToString.call(value) : '';
   return tag == funcTag || tag == genTag;
 }
@@ -2271,16 +2251,15 @@ function isFunction(value) {
 /**
  * Checks if `value` is a valid array-like length.
  *
- * **Note:** This function is loosely based on
- * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+ * **Note:** This method is loosely based on
+ * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
  *
  * @static
  * @memberOf _
  * @since 4.0.0
  * @category Lang
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a valid length,
- *  else `false`.
+ * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
  * @example
  *
  * _.isLength(3);
@@ -2302,7 +2281,7 @@ function isLength(value) {
 
 /**
  * Checks if `value` is the
- * [language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)
+ * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
  * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
  *
  * @static
@@ -2358,28 +2337,6 @@ function isObjectLike(value) {
   return !!value && typeof value == 'object';
 }
 
-/**
- * Checks if `value` is classified as a `String` primitive or object.
- *
- * @static
- * @since 0.1.0
- * @memberOf _
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a string, else `false`.
- * @example
- *
- * _.isString('abc');
- * // => true
- *
- * _.isString(1);
- * // => false
- */
-function isString(value) {
-  return typeof value == 'string' ||
-    (!isArray(value) && isObjectLike(value) && objectToString.call(value) == stringTag);
-}
-
 /**
  * Checks if `value` is classified as a `Symbol` primitive or object.
  *
@@ -2510,7 +2467,7 @@ function hasIn(object, path) {
  * Creates an array of the own enumerable property names of `object`.
  *
  * **Note:** Non-object values are coerced to objects. See the
- * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
+ * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
  * for more details.
  *
  * @static
@@ -2535,23 +2492,7 @@ function hasIn(object, path) {
  * // => ['0', '1']
  */
 function keys(object) {
-  var isProto = isPrototype(object);
-  if (!(isProto || isArrayLike(object))) {
-    return baseKeys(object);
-  }
-  var indexes = indexKeys(object),
-      skipIndexes = !!indexes,
-      result = indexes || [],
-      length = result.length;
-
-  for (var key in object) {
-    if (baseHas(object, key) &&
-        !(skipIndexes && (key == 'length' || isIndex(key, length))) &&
-        !(isProto && key == 'constructor')) {
-      result.push(key);
-    }
-  }
-  return result;
+  return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
 }
 
 /**
diff --git a/lodash.differenceby/package.json b/lodash.differenceby/package.json
index 50c248aa1..35841b057 100644
--- a/lodash.differenceby/package.json
+++ b/lodash.differenceby/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.differenceby",
-  "version": "4.7.1",
+  "version": "4.8.0",
   "description": "The lodash method `_.differenceBy` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.divide/README.md b/lodash.divide/README.md
index 31b8afd2c..83a020e8c 100644
--- a/lodash.divide/README.md
+++ b/lodash.divide/README.md
@@ -1,4 +1,4 @@
-# lodash.divide v4.7.0
+# lodash.divide v4.8.0
 
 The [lodash](https://lodash.com/) method `_.divide` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var divide = require('lodash.divide');
 ```
 
-See the [documentation](https://lodash.com/docs#divide) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.divide) for more details.
+See the [documentation](https://lodash.com/docs#divide) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.divide) for more details.
diff --git a/lodash.divide/index.js b/lodash.divide/index.js
index 643cf5590..5eaab1dee 100644
--- a/lodash.divide/index.js
+++ b/lodash.divide/index.js
@@ -1,11 +1,13 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
  * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  */
+var baseToNumber = require('lodash._basetonumber'),
+    baseToString = require('lodash._basetostring');
 
 /**
  * Creates a function that performs a mathematical operation on two values.
@@ -24,7 +26,17 @@ function createMathOperation(operator) {
       result = value;
     }
     if (other !== undefined) {
-      result = result === undefined ? other : operator(result, other);
+      if (result === undefined) {
+        return other;
+      }
+      if (typeof value == 'string' || typeof other == 'string') {
+        value = baseToString(value);
+        other = baseToString(other);
+      } else {
+        value = baseToNumber(value);
+        other = baseToNumber(other);
+      }
+      result = operator(value, other);
     }
     return result;
   };
diff --git a/lodash.divide/package.json b/lodash.divide/package.json
index 7ab2def90..c2d1d3e7e 100644
--- a/lodash.divide/package.json
+++ b/lodash.divide/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.divide",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.divide` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -13,5 +13,9 @@
     "Mathias Bynens <mathias@qiwi.be> (https://mathiasbynens.be/)"
   ],
   "repository": "lodash/lodash",
-  "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" }
+  "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
+  "dependencies": {
+    "lodash._basetonumber": "~4.12.0",
+    "lodash._basetostring": "~4.12.0"
+  }
 }
diff --git a/lodash.flatmapdeep/README.md b/lodash.flatmapdeep/README.md
index c81a41e69..28cd83a38 100644
--- a/lodash.flatmapdeep/README.md
+++ b/lodash.flatmapdeep/README.md
@@ -1,4 +1,4 @@
-# lodash.flatmapdeep v4.7.0
+# lodash.flatmapdeep v4.8.0
 
 The [lodash](https://lodash.com/) method `_.flatMapDeep` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var flatMapDeep = require('lodash.flatmapdeep');
 ```
 
-See the [documentation](https://lodash.com/docs#flatMapDeep) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.flatmapdeep) for more details.
+See the [documentation](https://lodash.com/docs#flatMapDeep) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.flatmapdeep) for more details.
diff --git a/lodash.flatmapdeep/index.js b/lodash.flatmapdeep/index.js
index b39c878d5..91fc3869c 100644
--- a/lodash.flatmapdeep/index.js
+++ b/lodash.flatmapdeep/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash 4.8.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
diff --git a/lodash.flatmapdeep/package.json b/lodash.flatmapdeep/package.json
index 93072e369..313338afd 100644
--- a/lodash.flatmapdeep/package.json
+++ b/lodash.flatmapdeep/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.flatmapdeep",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.flatMapDeep` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -15,7 +15,7 @@
   "repository": "lodash/lodash",
   "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
   "dependencies": {
-    "lodash._baseflatten": "~4.1.0",
+    "lodash._baseflatten": "~4.2.0",
     "lodash.map": "^4.0.0"
   }
 }
diff --git a/lodash.flatmapdepth/README.md b/lodash.flatmapdepth/README.md
index 424ad9339..1de689749 100644
--- a/lodash.flatmapdepth/README.md
+++ b/lodash.flatmapdepth/README.md
@@ -1,4 +1,4 @@
-# lodash.flatmapdepth v4.7.0
+# lodash.flatmapdepth v4.8.0
 
 The [lodash](https://lodash.com/) method `_.flatMapDepth` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var flatMapDepth = require('lodash.flatmapdepth');
 ```
 
-See the [documentation](https://lodash.com/docs#flatMapDepth) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.flatmapdepth) for more details.
+See the [documentation](https://lodash.com/docs#flatMapDepth) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.flatmapdepth) for more details.
diff --git a/lodash.flatmapdepth/index.js b/lodash.flatmapdepth/index.js
index 458007396..4c54ae7fc 100644
--- a/lodash.flatmapdepth/index.js
+++ b/lodash.flatmapdepth/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash 4.8.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
@@ -38,7 +38,8 @@ var freeParseInt = parseInt;
 var objectProto = Object.prototype;
 
 /**
- * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;
@@ -97,8 +98,9 @@ function isFunction(value) {
 }
 
 /**
- * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
- * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+ * Checks if `value` is the
+ * [language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)
+ * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
  *
  * @static
  * @memberOf _
diff --git a/lodash.flatmapdepth/package.json b/lodash.flatmapdepth/package.json
index 713113abc..1c3ddaece 100644
--- a/lodash.flatmapdepth/package.json
+++ b/lodash.flatmapdepth/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.flatmapdepth",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.flatMapDepth` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -15,7 +15,7 @@
   "repository": "lodash/lodash",
   "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
   "dependencies": {
-    "lodash._baseflatten": "~4.1.0",
+    "lodash._baseflatten": "~4.2.0",
     "lodash.map": "^4.0.0"
   }
 }
diff --git a/lodash.meanby/README.md b/lodash.meanby/README.md
index da1a6fb20..dc5ad87c6 100644
--- a/lodash.meanby/README.md
+++ b/lodash.meanby/README.md
@@ -1,4 +1,4 @@
-# lodash.meanby v4.7.0
+# lodash.meanby v4.8.0
 
 The [lodash](https://lodash.com/) method `_.meanBy` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var meanBy = require('lodash.meanby');
 ```
 
-See the [documentation](https://lodash.com/docs#meanBy) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.meanby) for more details.
+See the [documentation](https://lodash.com/docs#meanBy) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.meanby) for more details.
diff --git a/lodash.meanby/index.js b/lodash.meanby/index.js
index c89972519..a8aa16d18 100644
--- a/lodash.meanby/index.js
+++ b/lodash.meanby/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
diff --git a/lodash.meanby/package.json b/lodash.meanby/package.json
index 4c59e68b8..e8963f4bc 100644
--- a/lodash.meanby/package.json
+++ b/lodash.meanby/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.meanby",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.meanBy` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -15,6 +15,6 @@
   "repository": "lodash/lodash",
   "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
   "dependencies": {
-    "lodash._baseiteratee": "~4.6.0"
+    "lodash._baseiteratee": "~4.7.0"
   }
 }
diff --git a/lodash.multiply/README.md b/lodash.multiply/README.md
index 1cea10226..10501f704 100644
--- a/lodash.multiply/README.md
+++ b/lodash.multiply/README.md
@@ -1,4 +1,4 @@
-# lodash.multiply v4.7.0
+# lodash.multiply v4.8.0
 
 The [lodash](https://lodash.com/) method `_.multiply` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var multiply = require('lodash.multiply');
 ```
 
-See the [documentation](https://lodash.com/docs#multiply) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.multiply) for more details.
+See the [documentation](https://lodash.com/docs#multiply) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.multiply) for more details.
diff --git a/lodash.multiply/index.js b/lodash.multiply/index.js
index 827475204..30154f213 100644
--- a/lodash.multiply/index.js
+++ b/lodash.multiply/index.js
@@ -1,11 +1,13 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
  * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  */
+var baseToNumber = require('lodash._basetonumber'),
+    baseToString = require('lodash._basetostring');
 
 /**
  * Creates a function that performs a mathematical operation on two values.
@@ -24,7 +26,17 @@ function createMathOperation(operator) {
       result = value;
     }
     if (other !== undefined) {
-      result = result === undefined ? other : operator(result, other);
+      if (result === undefined) {
+        return other;
+      }
+      if (typeof value == 'string' || typeof other == 'string') {
+        value = baseToString(value);
+        other = baseToString(other);
+      } else {
+        value = baseToNumber(value);
+        other = baseToNumber(other);
+      }
+      result = operator(value, other);
     }
     return result;
   };
diff --git a/lodash.multiply/package.json b/lodash.multiply/package.json
index eb9cf583a..c51d206db 100644
--- a/lodash.multiply/package.json
+++ b/lodash.multiply/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.multiply",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.multiply` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -13,5 +13,9 @@
     "Mathias Bynens <mathias@qiwi.be> (https://mathiasbynens.be/)"
   ],
   "repository": "lodash/lodash",
-  "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" }
+  "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
+  "dependencies": {
+    "lodash._basetonumber": "~4.12.0",
+    "lodash._basetostring": "~4.12.0"
+  }
 }
diff --git a/lodash.unionby/README.md b/lodash.unionby/README.md
index dbc53cc9a..9954ad4a4 100644
--- a/lodash.unionby/README.md
+++ b/lodash.unionby/README.md
@@ -1,4 +1,4 @@
-# lodash.unionby v4.7.1
+# lodash.unionby v4.8.0
 
 The [lodash](https://lodash.com/) method `_.unionBy` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var unionBy = require('lodash.unionby');
 ```
 
-See the [documentation](https://lodash.com/docs#unionBy) or [package source](https://github.com/lodash/lodash/blob/4.7.1-npm-packages/lodash.unionby) for more details.
+See the [documentation](https://lodash.com/docs#unionBy) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.unionby) for more details.
diff --git a/lodash.unionby/index.js b/lodash.unionby/index.js
index 9e9193f3d..b61497ae1 100644
--- a/lodash.unionby/index.js
+++ b/lodash.unionby/index.js
@@ -62,7 +62,7 @@ var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
 
 /**
  * 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;
 
@@ -147,7 +147,7 @@ function apply(func, thisArg, args) {
  * 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`.
  */
@@ -160,7 +160,7 @@ function arrayIncludes(array, value) {
  * 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`.
@@ -223,7 +223,7 @@ function arraySome(array, predicate) {
  * 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.
@@ -245,7 +245,7 @@ function baseFindIndex(array, predicate, fromIndex, fromRight) {
  * 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`.
@@ -382,7 +382,7 @@ function mapToArray(map) {
 }
 
 /**
- * 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.
@@ -414,6 +414,7 @@ function setToArray(set) {
 
 /** Used for built-in method references. */
 var arrayProto = Array.prototype,
+    funcProto = Function.prototype,
     objectProto = Object.prototype;
 
 /** Used to detect overreaching core-js shims. */
@@ -426,14 +427,14 @@ var maskSrcKey = (function() {
 }());
 
 /** 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;
 
 /**
  * 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;
@@ -452,8 +453,7 @@ var Symbol = root.Symbol,
     spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeGetPrototype = Object.getPrototypeOf,
-    nativeKeys = Object.keys,
+var nativeKeys = overArg(Object.keys, Object),
     nativeMax = Math.max;
 
 /* Built-in method references that are verified to be native. */
@@ -922,11 +922,38 @@ Stack.prototype.get = stackGet;
 Stack.prototype.has = stackHas;
 Stack.prototype.set = stackSet;
 
+/**
+ * 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;
+}
+
 /**
  * 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`.
  */
@@ -1005,23 +1032,6 @@ function baseGetTag(value) {
   return objectToString.call(value);
 }
 
-/**
- * The base implementation of `_.has` without support for deep paths.
- *
- * @private
- * @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 object != null &&
-    (hasOwnProperty.call(object, key) ||
-      (typeof object == 'object' && key in object && getPrototype(object) === null));
-}
-
 /**
  * The base implementation of `_.hasIn` without support for deep paths.
  *
@@ -1224,14 +1234,24 @@ function baseIteratee(value) {
 }
 
 /**
- * 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;
+}
 
 /**
  * The base implementation of `_.matches` which doesn't clone `source`.
@@ -1538,7 +1558,7 @@ 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 + '');
 
@@ -1600,7 +1620,7 @@ 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;
     }
   }
@@ -1651,19 +1671,6 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
   return result;
 }
 
-/**
- * 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');
-
 /**
  * Gets the data for `map`.
  *
@@ -1712,15 +1719,6 @@ function getNative(object, key) {
   return baseIsNative(value) ? value : undefined;
 }
 
-/**
- * Gets the `[[Prototype]]` of `value`.
- *
- * @private
- * @param {*} value The value to query.
- * @returns {null|Object} Returns the `[[Prototype]]`.
- */
-var getPrototype = overArg(nativeGetPrototype, Object);
-
 /**
  * Gets the `toStringTag` of `value`.
  *
@@ -1731,7 +1729,7 @@ var getPrototype = overArg(nativeGetPrototype, Object);
 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.
+// for data views in Edge < 14, and promises in Node.js.
 if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
     (Map && getTag(new Map) != mapTag) ||
     (Promise && getTag(Promise.resolve()) != promiseTag) ||
@@ -1783,24 +1781,7 @@ function hasPath(object, path, hasFunc) {
   }
   var length = object ? object.length : 0;
   return !!length && isLength(length) && isIndex(key, length) &&
-    (isArray(object) || isString(object) || isArguments(object));
-}
-
-/**
- * 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;
+    (isArray(object) || isArguments(object));
 }
 
 /**
@@ -2036,7 +2017,7 @@ var unionBy = baseRest(function(arrays) {
  * **Note:** The cache is exposed as the `cache` property on the memoized
  * function. Its creation may be customized by replacing the `_.memoize.Cache`
  * constructor with one whose instances implement the
- * [`Map`](http://ecma-international.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object)
+ * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
  * method interface of `delete`, `get`, `has`, and `set`.
  *
  * @static
@@ -2095,7 +2076,7 @@ memoize.Cache = MapCache;
 
 /**
  * Performs a
- * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  * comparison between two values to determine if they are equivalent.
  *
  * @static
@@ -2148,7 +2129,7 @@ function eq(value, other) {
  * // => false
  */
 function isArguments(value) {
-  // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
+  // Safari 8.1 makes `arguments.callee` enumerable in strict mode.
   return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
     (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
 }
@@ -2204,7 +2185,7 @@ var isArray = Array.isArray;
  * // => false
  */
 function isArrayLike(value) {
-  return value != null && isLength(getLength(value)) && !isFunction(value);
+  return value != null && isLength(value.length) && !isFunction(value);
 }
 
 /**
@@ -2255,8 +2236,7 @@ function isArrayLikeObject(value) {
  */
 function isFunction(value) {
   // The use of `Object#toString` avoids issues with the `typeof` operator
-  // in Safari 8 which returns 'object' for typed array and weak map constructors,
-  // and PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+  // in Safari 8-9 which returns 'object' for typed array and other constructors.
   var tag = isObject(value) ? objectToString.call(value) : '';
   return tag == funcTag || tag == genTag;
 }
@@ -2264,16 +2244,15 @@ function isFunction(value) {
 /**
  * Checks if `value` is a valid array-like length.
  *
- * **Note:** This function is loosely based on
- * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+ * **Note:** This method is loosely based on
+ * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
  *
  * @static
  * @memberOf _
  * @since 4.0.0
  * @category Lang
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a valid length,
- *  else `false`.
+ * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
  * @example
  *
  * _.isLength(3);
@@ -2295,7 +2274,7 @@ function isLength(value) {
 
 /**
  * Checks if `value` is the
- * [language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)
+ * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
  * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
  *
  * @static
@@ -2351,28 +2330,6 @@ function isObjectLike(value) {
   return !!value && typeof value == 'object';
 }
 
-/**
- * Checks if `value` is classified as a `String` primitive or object.
- *
- * @static
- * @since 0.1.0
- * @memberOf _
- * @category Lang
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a string, else `false`.
- * @example
- *
- * _.isString('abc');
- * // => true
- *
- * _.isString(1);
- * // => false
- */
-function isString(value) {
-  return typeof value == 'string' ||
-    (!isArray(value) && isObjectLike(value) && objectToString.call(value) == stringTag);
-}
-
 /**
  * Checks if `value` is classified as a `Symbol` primitive or object.
  *
@@ -2503,7 +2460,7 @@ function hasIn(object, path) {
  * Creates an array of the own enumerable property names of `object`.
  *
  * **Note:** Non-object values are coerced to objects. See the
- * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
+ * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
  * for more details.
  *
  * @static
@@ -2528,23 +2485,7 @@ function hasIn(object, path) {
  * // => ['0', '1']
  */
 function keys(object) {
-  var isProto = isPrototype(object);
-  if (!(isProto || isArrayLike(object))) {
-    return baseKeys(object);
-  }
-  var indexes = indexKeys(object),
-      skipIndexes = !!indexes,
-      result = indexes || [],
-      length = result.length;
-
-  for (var key in object) {
-    if (baseHas(object, key) &&
-        !(skipIndexes && (key == 'length' || isIndex(key, length))) &&
-        !(isProto && key == 'constructor')) {
-      result.push(key);
-    }
-  }
-  return result;
+  return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
 }
 
 /**
diff --git a/lodash.unionby/package.json b/lodash.unionby/package.json
index 00797d7a5..8d40dd27c 100644
--- a/lodash.unionby/package.json
+++ b/lodash.unionby/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.unionby",
-  "version": "4.7.1",
+  "version": "4.8.0",
   "description": "The lodash method `_.unionBy` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/lodash.update/README.md b/lodash.update/README.md
index 5289b0603..b30fb2964 100644
--- a/lodash.update/README.md
+++ b/lodash.update/README.md
@@ -1,4 +1,4 @@
-# lodash.update v4.7.0
+# lodash.update v4.8.0
 
 The [lodash](https://lodash.com/) method `_.update` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var update = require('lodash.update');
 ```
 
-See the [documentation](https://lodash.com/docs#update) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.update) for more details.
+See the [documentation](https://lodash.com/docs#update) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.update) for more details.
diff --git a/lodash.update/index.js b/lodash.update/index.js
index 643e95e1f..24594ce9a 100644
--- a/lodash.update/index.js
+++ b/lodash.update/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
@@ -9,6 +9,9 @@
 var baseSet = require('lodash._baseset'),
     stringToPath = require('lodash._stringtopath');
 
+/** Used as references for various `Number` constants. */
+var INFINITY = 1 / 0;
+
 /** `Object#toString` result references. */
 var symbolTag = '[object Symbol]';
 
@@ -41,7 +44,7 @@ function baseGet(object, path) {
       length = path.length;
 
   while (object != null && index < length) {
-    object = object[path[index++]];
+    object = object[toKey(path[index++])];
   }
   return (index && index == length) ? object : undefined;
 }
@@ -91,13 +94,31 @@ function castPath(value) {
  * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
  */
 function isKey(value, object) {
+  if (isArray(value)) {
+    return false;
+  }
   var type = typeof value;
-  if (type == 'number' || type == 'symbol') {
+  if (type == 'number' || type == 'symbol' || type == 'boolean' ||
+      value == null || isSymbol(value)) {
     return true;
   }
-  return !isArray(value) &&
-    (isSymbol(value) || reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
-      (object != null && value in Object(object)));
+  return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+    (object != null && value in Object(object));
+}
+
+/**
+ * Converts `value` to a string key if it's not a string or symbol.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {string|symbol} Returns the key.
+ */
+function toKey(value) {
+  if (typeof value == 'string' || isSymbol(value)) {
+    return value;
+  }
+  var result = (value + '');
+  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
 }
 
 /**
diff --git a/lodash.update/package.json b/lodash.update/package.json
index 0f22f0493..d110f3eb6 100644
--- a/lodash.update/package.json
+++ b/lodash.update/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.update",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.update` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -16,6 +16,6 @@
   "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
   "dependencies": {
     "lodash._baseset": "~4.2.0",
-    "lodash._stringtopath": "~4.7.0"
+    "lodash._stringtopath": "~4.8.0"
   }
 }
diff --git a/lodash.updatewith/README.md b/lodash.updatewith/README.md
index ef8d23ce2..ef6f0a0b1 100644
--- a/lodash.updatewith/README.md
+++ b/lodash.updatewith/README.md
@@ -1,4 +1,4 @@
-# lodash.updatewith v4.7.0
+# lodash.updatewith v4.8.0
 
 The [lodash](https://lodash.com/) method `_.updateWith` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -15,4 +15,4 @@ In Node.js:
 var updateWith = require('lodash.updatewith');
 ```
 
-See the [documentation](https://lodash.com/docs#updateWith) or [package source](https://github.com/lodash/lodash/blob/4.7.0-npm-packages/lodash.updatewith) for more details.
+See the [documentation](https://lodash.com/docs#updateWith) or [package source](https://github.com/lodash/lodash/blob/4.8.0-npm-packages/lodash.updatewith) for more details.
diff --git a/lodash.updatewith/index.js b/lodash.updatewith/index.js
index b4486591f..3cb16c531 100644
--- a/lodash.updatewith/index.js
+++ b/lodash.updatewith/index.js
@@ -1,5 +1,5 @@
 /**
- * lodash 4.7.0 (Custom Build) <https://lodash.com/>
+ * lodash (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
  * Copyright jQuery Foundation and other contributors <https://jquery.org/>
  * Released under MIT license <https://lodash.com/license>
@@ -9,6 +9,9 @@
 var baseSet = require('lodash._baseset'),
     stringToPath = require('lodash._stringtopath');
 
+/** Used as references for various `Number` constants. */
+var INFINITY = 1 / 0;
+
 /** `Object#toString` result references. */
 var symbolTag = '[object Symbol]';
 
@@ -41,7 +44,7 @@ function baseGet(object, path) {
       length = path.length;
 
   while (object != null && index < length) {
-    object = object[path[index++]];
+    object = object[toKey(path[index++])];
   }
   return (index && index == length) ? object : undefined;
 }
@@ -91,13 +94,31 @@ function castPath(value) {
  * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
  */
 function isKey(value, object) {
+  if (isArray(value)) {
+    return false;
+  }
   var type = typeof value;
-  if (type == 'number' || type == 'symbol') {
+  if (type == 'number' || type == 'symbol' || type == 'boolean' ||
+      value == null || isSymbol(value)) {
     return true;
   }
-  return !isArray(value) &&
-    (isSymbol(value) || reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
-      (object != null && value in Object(object)));
+  return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+    (object != null && value in Object(object));
+}
+
+/**
+ * Converts `value` to a string key if it's not a string or symbol.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {string|symbol} Returns the key.
+ */
+function toKey(value) {
+  if (typeof value == 'string' || isSymbol(value)) {
+    return value;
+  }
+  var result = (value + '');
+  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
 }
 
 /**
diff --git a/lodash.updatewith/package.json b/lodash.updatewith/package.json
index e04f597c1..4aee1267b 100644
--- a/lodash.updatewith/package.json
+++ b/lodash.updatewith/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash.updatewith",
-  "version": "4.7.0",
+  "version": "4.8.0",
   "description": "The lodash method `_.updateWith` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
@@ -16,6 +16,6 @@
   "scripts": { "test": "echo \"See https://travis-ci.org/lodash/lodash-cli for testing details.\"" },
   "dependencies": {
     "lodash._baseset": "~4.2.0",
-    "lodash._stringtopath": "~4.7.0"
+    "lodash._stringtopath": "~4.8.0"
   }
 }