diff --git a/README.md b/README.md
index 1f769e3a1..c46df68d2 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash-amd v4.14.1
+# lodash-amd v4.14.2
 
 The [Lodash](https://lodash.com/) library exported as [AMD](https://github.com/amdjs/amdjs-api/wiki/AMD) modules.
 
@@ -27,4 +27,4 @@ require({
 });
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.14.1-amd) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.14.2-amd) for more details.
diff --git a/_Reflect.js b/_Reflect.js
deleted file mode 100644
index b0fcc5d42..000000000
--- a/_Reflect.js
+++ /dev/null
@@ -1,7 +0,0 @@
-define(['./_root'], function(root) {
-
-  /** Built-in value references. */
-  var Reflect = root.Reflect;
-
-  return Reflect;
-});
diff --git a/_arrayLikeKeys.js b/_arrayLikeKeys.js
new file mode 100644
index 000000000..4f33c1cd3
--- /dev/null
+++ b/_arrayLikeKeys.js
@@ -0,0 +1,35 @@
+define(['./_baseTimes', './isArguments', './isArray', './_isIndex', './isString'], function(baseTimes, isArguments, isArray, isIndex, isString) {
+
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
+  /**
+   * Creates an array of the enumerable property names of the array-like `value`.
+   *
+   * @private
+   * @param {*} value The value to query.
+   * @param {boolean} inherited Specify returning inherited property names.
+   * @returns {Array} Returns the array of property names.
+   */
+  function arrayLikeKeys(value, inherited) {
+    var result = (isArray(value) || isString(value) || isArguments(value))
+      ? baseTimes(value.length, String)
+      : [];
+
+    var length = result.length,
+        skipIndexes = !!length;
+
+    for (var key in value) {
+      if ((inherited || hasOwnProperty.call(value, key)) &&
+          !(skipIndexes && (key == 'length' || isIndex(key, length)))) {
+        result.push(key);
+      }
+    }
+    return result;
+  }
+
+  return arrayLikeKeys;
+});
diff --git a/_assignValue.js b/_assignValue.js
index c93e69b4b..c6a7cba31 100644
--- a/_assignValue.js
+++ b/_assignValue.js
@@ -11,7 +11,7 @@ define(['./eq'], function(eq) {
 
   /**
    * 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
diff --git a/_baseConformsTo.js b/_baseConformsTo.js
index 46bd8a088..6a8dcf2ce 100644
--- a/_baseConformsTo.js
+++ b/_baseConformsTo.js
@@ -16,14 +16,13 @@ define([], function() {
     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;
       }
     }
diff --git a/_baseDelay.js b/_baseDelay.js
index a4589e785..9344e48ec 100644
--- a/_baseDelay.js
+++ b/_baseDelay.js
@@ -14,7 +14,7 @@ define([], 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') {
diff --git a/_baseGetTag.js b/_baseGetTag.js
index c1d0e3116..62a8a2477 100644
--- a/_baseGetTag.js
+++ b/_baseGetTag.js
@@ -5,7 +5,7 @@ define([], function() {
 
   /**
    * 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;
diff --git a/_baseHas.js b/_baseHas.js
index 51eb1eadb..8c069c6ff 100644
--- a/_baseHas.js
+++ b/_baseHas.js
@@ -1,4 +1,4 @@
-define(['./_getPrototype'], function(getPrototype) {
+define([], function() {
 
   /** Used for built-in method references. */
   var objectProto = Object.prototype;
@@ -15,12 +15,7 @@ define(['./_getPrototype'], function(getPrototype) {
    * @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);
   }
 
   return baseHas;
diff --git a/_baseIsArrayBuffer.js b/_baseIsArrayBuffer.js
index 837dbfd43..6e6e5caeb 100644
--- a/_baseIsArrayBuffer.js
+++ b/_baseIsArrayBuffer.js
@@ -7,7 +7,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
diff --git a/_baseIsDate.js b/_baseIsDate.js
index ecffb6246..d7029b98f 100644
--- a/_baseIsDate.js
+++ b/_baseIsDate.js
@@ -8,7 +8,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
diff --git a/_baseIsNative.js b/_baseIsNative.js
index 3c8346644..3c1867cdd 100644
--- a/_baseIsNative.js
+++ b/_baseIsNative.js
@@ -2,7 +2,7 @@ define(['./isFunction', './_isHostObject', './_isMasked', './isObject', './_toSo
 
   /**
    * 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;
 
diff --git a/_baseIsRegExp.js b/_baseIsRegExp.js
index 1cbd88604..3ccd3d813 100644
--- a/_baseIsRegExp.js
+++ b/_baseIsRegExp.js
@@ -8,7 +8,7 @@ define(['./isObject'], function(isObject) {
 
   /**
    * 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;
diff --git a/_baseIsTypedArray.js b/_baseIsTypedArray.js
index 0bacaf06f..0413fbef3 100644
--- a/_baseIsTypedArray.js
+++ b/_baseIsTypedArray.js
@@ -48,7 +48,7 @@ define(['./isLength', './isObjectLike'], function(isLength, isObjectLike) {
 
   /**
    * 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;
diff --git a/_baseKeys.js b/_baseKeys.js
index ee94f3748..88fdb4e3b 100644
--- a/_baseKeys.js
+++ b/_baseKeys.js
@@ -1,17 +1,30 @@
-define(['./_overArg'], function(overArg) {
+define(['./_isPrototype', './_nativeKeys'], function(isPrototype, nativeKeys) {
 
-  /* 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;
+  }
 
   return baseKeys;
 });
diff --git a/_baseKeysIn.js b/_baseKeysIn.js
index ed8a694a8..e4b845c4e 100644
--- a/_baseKeysIn.js
+++ b/_baseKeysIn.js
@@ -1,39 +1,32 @@
-define(['./_Reflect', './_iteratorToArray'], function(Reflect, iteratorToArray) {
-
-  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
-  var undefined;
+define(['./isObject', './_isPrototype', './_nativeKeysIn'], function(isObject, isPrototype, nativeKeysIn) {
 
   /** Used for built-in method references. */
   var objectProto = Object.prototype;
 
-  /** Built-in value references. */
-  var enumerate = Reflect ? Reflect.enumerate : undefined,
-      propertyIsEnumerable = objectProto.propertyIsEnumerable;
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
 
   /**
-   * The base implementation of `_.keysIn` which doesn't skip the constructor
-   * property of prototypes or treat sparse arrays as dense.
+   * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
    *
    * @private
    * @param {Object} object The object to query.
    * @returns {Array} Returns the array of property names.
    */
   function baseKeysIn(object) {
-    object = object == null ? object : Object(object);
+    if (!isObject(object)) {
+      return nativeKeysIn(object);
+    }
+    var isProto = isPrototype(object),
+        result = [];
 
-    var result = [];
     for (var key in object) {
-      result.push(key);
+      if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
+        result.push(key);
+      }
     }
     return result;
   }
 
-  // Fallback for IE < 9 with es6-shim.
-  if (enumerate && !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf')) {
-    baseKeysIn = function(object) {
-      return iteratorToArray(enumerate(object));
-    };
-  }
-
   return baseKeysIn;
 });
diff --git a/_baseMerge.js b/_baseMerge.js
index 201dae764..e7b16a4c1 100644
--- a/_baseMerge.js
+++ b/_baseMerge.js
@@ -1,4 +1,4 @@
-define(['./_Stack', './_arrayEach', './_assignMergeValue', './_baseMergeDeep', './isArray', './isObject', './isTypedArray', './keysIn'], function(Stack, arrayEach, assignMergeValue, baseMergeDeep, isArray, isObject, isTypedArray, keysIn) {
+define(['./_Stack', './_arrayEach', './_assignMergeValue', './_baseKeysIn', './_baseMergeDeep', './isArray', './isObject', './isTypedArray'], function(Stack, arrayEach, assignMergeValue, baseKeysIn, baseMergeDeep, isArray, isObject, isTypedArray) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -19,7 +19,7 @@ define(['./_Stack', './_arrayEach', './_assignMergeValue', './_baseMergeDeep', '
       return;
     }
     if (!(isArray(source) || isTypedArray(source))) {
-      var props = keysIn(source);
+      var props = baseKeysIn(source);
     }
     arrayEach(props || source, function(srcValue, key) {
       if (props) {
diff --git a/_baseSet.js b/_baseSet.js
index 112cd3ab2..b6e9554c9 100644
--- a/_baseSet.js
+++ b/_baseSet.js
@@ -14,6 +14,9 @@ define(['./_assignValue', './_castPath', './_isIndex', './_isKey', './isObject',
    * @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,
@@ -22,20 +25,19 @@ define(['./_assignValue', './_castPath', './_isIndex', './_isKey', './isObject',
         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;
diff --git a/_baseUnset.js b/_baseUnset.js
index 8db380046..8899ef343 100644
--- a/_baseUnset.js
+++ b/_baseUnset.js
@@ -1,4 +1,10 @@
-define(['./_baseHas', './_castPath', './_isKey', './last', './_parent', './_toKey'], function(baseHas, castPath, isKey, last, parent, toKey) {
+define(['./_castPath', './_isKey', './last', './_parent', './_toKey'], function(castPath, isKey, last, parent, toKey) {
+
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
 
   /**
    * The base implementation of `_.unset`.
@@ -13,7 +19,7 @@ define(['./_baseHas', './_castPath', './_isKey', './last', './_parent', './_toKe
     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];
   }
 
   return baseUnset;
diff --git a/_createCtor.js b/_createCtor.js
index ef5d00f24..96e472e6b 100644
--- a/_createCtor.js
+++ b/_createCtor.js
@@ -11,7 +11,7 @@ define(['./_baseCreate', './isObject'], function(baseCreate, isObject) {
   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) {
diff --git a/_equalByTag.js b/_equalByTag.js
index 196993702..51df7a919 100644
--- a/_equalByTag.js
+++ b/_equalByTag.js
@@ -73,7 +73,7 @@ define(['./_Symbol', './_Uint8Array', './eq', './_equalArrays', './_mapToArray',
       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 + '');
 
diff --git a/_equalObjects.js b/_equalObjects.js
index 94c4a9a60..df4cc37b5 100644
--- a/_equalObjects.js
+++ b/_equalObjects.js
@@ -1,4 +1,4 @@
-define(['./_baseHas', './keys'], function(baseHas, keys) {
+define(['./keys'], function(keys) {
 
   /** Used as a safe reference for `undefined` in pre-ES5 environments. */
   var undefined;
@@ -6,6 +6,12 @@ define(['./_baseHas', './keys'], function(baseHas, keys) {
   /** Used to compose bitmasks for comparison styles. */
   var PARTIAL_COMPARE_FLAG = 2;
 
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
   /**
    * A specialized version of `baseIsEqualDeep` for objects with support for
    * partial deep comparisons.
@@ -33,7 +39,7 @@ define(['./_baseHas', './keys'], function(baseHas, keys) {
     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;
       }
     }
diff --git a/_getLength.js b/_getLength.js
deleted file mode 100644
index d59b46856..000000000
--- a/_getLength.js
+++ /dev/null
@@ -1,17 +0,0 @@
-define(['./_baseProperty'], function(baseProperty) {
-
-  /**
-   * 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');
-
-  return getLength;
-});
diff --git a/_getPrototype.js b/_getPrototype.js
index 23b90a35f..a2e50e8c0 100644
--- a/_getPrototype.js
+++ b/_getPrototype.js
@@ -1,16 +1,7 @@
 define(['./_overArg'], function(overArg) {
 
-  /* 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);
 
   return getPrototype;
 });
diff --git a/_getTag.js b/_getTag.js
index fb364a10b..17cb0c6b4 100644
--- a/_getTag.js
+++ b/_getTag.js
@@ -17,7 +17,7 @@ define(['./_DataView', './_Map', './_Promise', './_Set', './_WeakMap', './_baseG
 
   /**
    * 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;
diff --git a/_indexKeys.js b/_indexKeys.js
deleted file mode 100644
index 06ad5b4c9..000000000
--- a/_indexKeys.js
+++ /dev/null
@@ -1,24 +0,0 @@
-define(['./_baseTimes', './isArguments', './isArray', './isLength', './isString'], function(baseTimes, isArguments, isArray, isLength, isString) {
-
-  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
-  var undefined;
-
-  /**
-   * 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;
-  }
-
-  return indexKeys;
-});
diff --git a/_nativeKeys.js b/_nativeKeys.js
new file mode 100644
index 000000000..492fd82c4
--- /dev/null
+++ b/_nativeKeys.js
@@ -0,0 +1,7 @@
+define(['./_overArg'], function(overArg) {
+
+  /* Built-in method references for those with the same name as other `lodash` methods. */
+  var nativeKeys = overArg(Object.keys, Object);
+
+  return nativeKeys;
+});
diff --git a/_nativeKeysIn.js b/_nativeKeysIn.js
new file mode 100644
index 000000000..011992d9f
--- /dev/null
+++ b/_nativeKeysIn.js
@@ -0,0 +1,23 @@
+define([], function() {
+
+  /**
+   * 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;
+  }
+
+  return nativeKeysIn;
+});
diff --git a/_overArg.js b/_overArg.js
index e39423dfb..4d72f4637 100644
--- a/_overArg.js
+++ b/_overArg.js
@@ -1,7 +1,7 @@
 define([], function() {
 
   /**
-   * 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.
diff --git a/assignIn.js b/assignIn.js
index a9533795e..29b084172 100644
--- a/assignIn.js
+++ b/assignIn.js
@@ -1,13 +1,4 @@
-define(['./_assignValue', './_copyObject', './_createAssigner', './isArrayLike', './_isPrototype', './keysIn'], function(assignValue, copyObject, createAssigner, isArrayLike, isPrototype, keysIn) {
-
-  /** Used for built-in method references. */
-  var objectProto = Object.prototype;
-
-  /** Built-in value references. */
-  var propertyIsEnumerable = objectProto.propertyIsEnumerable;
-
-  /** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
-  var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
+define(['./_copyObject', './_createAssigner', './keysIn'], function(copyObject, createAssigner, keysIn) {
 
   /**
    * This method is like `_.assign` except that it iterates over own and
@@ -41,13 +32,7 @@ define(['./_assignValue', './_copyObject', './_createAssigner', './isArrayLike',
    * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
    */
   var assignIn = createAssigner(function(object, source) {
-    if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
-      copyObject(source, keysIn(source), object);
-      return;
-    }
-    for (var key in source) {
-      assignValue(object, key, source[key]);
-    }
+    copyObject(source, keysIn(source), object);
   });
 
   return assignIn;
diff --git a/difference.js b/difference.js
index 862d89549..c5cdf9614 100644
--- a/difference.js
+++ b/difference.js
@@ -2,7 +2,7 @@ define(['./_baseDifference', './_baseFlatten', './_baseRest', './isArrayLikeObje
 
   /**
    * Creates an array of `array` values not included in the other given arrays
-   * 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. The order of result values is determined by the
    * order they occur in the first array.
    *
diff --git a/eq.js b/eq.js
index 0c5a2d712..ad2605d7e 100644
--- a/eq.js
+++ b/eq.js
@@ -2,7 +2,7 @@ define([], function() {
 
   /**
    * 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
diff --git a/escapeRegExp.js b/escapeRegExp.js
index 03d653aed..fed17caa9 100644
--- a/escapeRegExp.js
+++ b/escapeRegExp.js
@@ -2,7 +2,7 @@ define(['./toString'], function(toString) {
 
   /**
    * 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,
       reHasRegExpChar = RegExp(reRegExpChar.source);
diff --git a/every.js b/every.js
index 80b70a316..b9aeeee9d 100644
--- a/every.js
+++ b/every.js
@@ -8,6 +8,11 @@ define(['./_arrayEvery', './_baseEvery', './_baseIteratee', './isArray', './_isI
    * Iteration is stopped once `predicate` returns falsey. The predicate is
    * invoked with three arguments: (value, index|key, collection).
    *
+   * **Note:** This method returns `true` for
+   * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
+   * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
+   * elements of empty collections.
+   *
    * @static
    * @memberOf _
    * @since 0.1.0
diff --git a/includes.js b/includes.js
index e244655ba..19fbc218b 100644
--- a/includes.js
+++ b/includes.js
@@ -6,7 +6,7 @@ define(['./_baseIndexOf', './isArrayLike', './isString', './toInteger', './value
   /**
    * Checks if `value` is in `collection`. If `collection` is a string, it's
    * checked for a substring of `value`, otherwise
-   * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
    * is used for equality comparisons. If `fromIndex` is negative, it's used as
    * the offset from the end of `collection`.
    *
diff --git a/indexOf.js b/indexOf.js
index 890f01a08..2ec35078f 100644
--- a/indexOf.js
+++ b/indexOf.js
@@ -5,7 +5,7 @@ define(['./_baseIndexOf', './toInteger'], function(baseIndexOf, toInteger) {
 
   /**
    * Gets the index at which the first occurrence of `value` is found in `array`
-   * 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. If `fromIndex` is negative, it's used as the
    * offset from the end of `array`.
    *
diff --git a/initial.js b/initial.js
index 0bfabc051..7f68d75c3 100644
--- a/initial.js
+++ b/initial.js
@@ -1,4 +1,4 @@
-define(['./dropRight'], function(dropRight) {
+define(['./_baseSlice'], function(baseSlice) {
 
   /**
    * Gets all but the last element of `array`.
@@ -15,7 +15,8 @@ define(['./dropRight'], function(dropRight) {
    * // => [1, 2]
    */
   function initial(array) {
-    return dropRight(array, 1);
+    var length = array ? array.length : 0;
+    return length ? baseSlice(array, 0, -1) : [];
   }
 
   return initial;
diff --git a/intersection.js b/intersection.js
index 6b8a69fdf..ae21fefa8 100644
--- a/intersection.js
+++ b/intersection.js
@@ -2,7 +2,7 @@ define(['./_arrayMap', './_baseIntersection', './_baseRest', './_castArrayLikeOb
 
   /**
    * Creates an array of unique values that are included in all given arrays
-   * 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. The order of result values is determined by the
    * order they occur in the first array.
    *
diff --git a/isArguments.js b/isArguments.js
index d6b4150a3..dc2671cfd 100644
--- a/isArguments.js
+++ b/isArguments.js
@@ -11,7 +11,7 @@ define(['./isArrayLikeObject'], function(isArrayLikeObject) {
 
   /**
    * 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;
diff --git a/isArrayLike.js b/isArrayLike.js
index c8cd8761c..915c47e1f 100644
--- a/isArrayLike.js
+++ b/isArrayLike.js
@@ -1,4 +1,4 @@
-define(['./_getLength', './isFunction', './isLength'], function(getLength, isFunction, isLength) {
+define(['./isFunction', './isLength'], function(isFunction, isLength) {
 
   /**
    * Checks if `value` is array-like. A value is considered array-like if it's
@@ -26,7 +26,7 @@ define(['./_getLength', './isFunction', './isLength'], function(getLength, isFun
    * // => false
    */
   function isArrayLike(value) {
-    return value != null && isLength(getLength(value)) && !isFunction(value);
+    return value != null && isLength(value.length) && !isFunction(value);
   }
 
   return isArrayLike;
diff --git a/isBoolean.js b/isBoolean.js
index 22d848b06..7d95eb023 100644
--- a/isBoolean.js
+++ b/isBoolean.js
@@ -8,7 +8,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
diff --git a/isElement.js b/isElement.js
index 5ed4aec74..a801d56ec 100644
--- a/isElement.js
+++ b/isElement.js
@@ -8,8 +8,7 @@ define(['./isObjectLike', './isPlainObject'], function(isObjectLike, isPlainObje
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a DOM element,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
    * @example
    *
    * _.isElement(document.body);
diff --git a/isEmpty.js b/isEmpty.js
index 99db7ed95..c83b7ee79 100644
--- a/isEmpty.js
+++ b/isEmpty.js
@@ -1,4 +1,4 @@
-define(['./_getTag', './isArguments', './isArray', './isArrayLike', './isBuffer', './isFunction', './isObjectLike', './isString', './keys'], function(getTag, isArguments, isArray, isArrayLike, isBuffer, isFunction, isObjectLike, isString, keys) {
+define(['./_getTag', './isArguments', './isArray', './isArrayLike', './isBuffer', './isFunction', './isObjectLike', './_isPrototype', './isString', './_nativeKeys'], function(getTag, isArguments, isArray, isArrayLike, isBuffer, isFunction, isObjectLike, isPrototype, isString, nativeKeys) {
 
   /** `Object#toString` result references. */
   var mapTag = '[object Map]',
@@ -61,12 +61,14 @@ define(['./_getTag', './isArguments', './isArray', './isArrayLike', './isBuffer'
         return !value.size;
       }
     }
+    var isProto = isPrototype(value);
     for (var key in value) {
-      if (hasOwnProperty.call(value, key)) {
+      if (hasOwnProperty.call(value, key) &&
+          !(isProto && key == 'constructor')) {
         return false;
       }
     }
-    return !(nonEnumShadows && keys(value).length);
+    return !(nonEnumShadows && nativeKeys(value).length);
   }
 
   return isEmpty;
diff --git a/isEqual.js b/isEqual.js
index c53bff31f..605e44613 100644
--- a/isEqual.js
+++ b/isEqual.js
@@ -16,8 +16,7 @@ define(['./_baseIsEqual'], function(baseIsEqual) {
    * @category Lang
    * @param {*} value The value to compare.
    * @param {*} other The other value to compare.
-   * @returns {boolean} Returns `true` if the values are equivalent,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
    * @example
    *
    * var object = { 'a': 1 };
diff --git a/isEqualWith.js b/isEqualWith.js
index c4c3a07de..c4e62066c 100644
--- a/isEqualWith.js
+++ b/isEqualWith.js
@@ -16,8 +16,7 @@ define(['./_baseIsEqual'], function(baseIsEqual) {
    * @param {*} value The value to compare.
    * @param {*} other The other value to compare.
    * @param {Function} [customizer] The function to customize comparisons.
-   * @returns {boolean} Returns `true` if the values are equivalent,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
    * @example
    *
    * function isGreeting(value) {
diff --git a/isError.js b/isError.js
index 914544755..4eb11cee3 100644
--- a/isError.js
+++ b/isError.js
@@ -8,7 +8,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
@@ -22,8 +22,7 @@ define(['./isObjectLike'], function(isObjectLike) {
    * @since 3.0.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is an error object,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
    * @example
    *
    * _.isError(new Error);
diff --git a/isFinite.js b/isFinite.js
index 9ae9d842b..11cbc317d 100644
--- a/isFinite.js
+++ b/isFinite.js
@@ -14,8 +14,7 @@ define(['./_root'], function(root) {
    * @since 0.1.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a finite number,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
    * @example
    *
    * _.isFinite(3);
diff --git a/isFunction.js b/isFunction.js
index 4d3667fb5..e8044df2b 100644
--- a/isFunction.js
+++ b/isFunction.js
@@ -9,7 +9,7 @@ define(['./isObject'], function(isObject) {
 
   /**
    * 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;
diff --git a/isLength.js b/isLength.js
index 3cde9c1af..4a7f3746b 100644
--- a/isLength.js
+++ b/isLength.js
@@ -6,16 +6,15 @@ define([], function() {
   /**
    * 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);
diff --git a/isMatch.js b/isMatch.js
index 89e317ead..f71bcd082 100644
--- a/isMatch.js
+++ b/isMatch.js
@@ -4,8 +4,12 @@ define(['./_baseIsMatch', './_getMatchData'], function(baseIsMatch, getMatchData
    * Performs a partial deep comparison between `object` and `source` to
    * determine if `object` contains equivalent property values.
    *
-   * **Note:** This method supports comparing the same values as `_.isEqual`
-   * and is equivalent to `_.matches` when `source` is partially applied.
+   * **Note:** This method is equivalent to `_.matches` when `source` is
+   * partially applied.
+   *
+   * Partial comparisons will match empty array and empty object `source`
+   * values against any array or object value, respectively. See `_.isEqual`
+   * for a list of supported value comparisons.
    *
    * @static
    * @memberOf _
diff --git a/isNumber.js b/isNumber.js
index f276a2438..777a8e227 100644
--- a/isNumber.js
+++ b/isNumber.js
@@ -8,7 +8,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
diff --git a/isObject.js b/isObject.js
index 1c760012c..5480483df 100644
--- a/isObject.js
+++ b/isObject.js
@@ -2,7 +2,7 @@ define([], function() {
 
   /**
    * 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
diff --git a/isPlainObject.js b/isPlainObject.js
index b97a432a8..a13e826a9 100644
--- a/isPlainObject.js
+++ b/isPlainObject.js
@@ -17,7 +17,7 @@ define(['./_getPrototype', './_isHostObject', './isObjectLike'], function(getPro
 
   /**
    * 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;
@@ -31,8 +31,7 @@ define(['./_getPrototype', './_isHostObject', './isObjectLike'], function(getPro
    * @since 0.8.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a plain object,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
    * @example
    *
    * function Foo() {
diff --git a/isSafeInteger.js b/isSafeInteger.js
index 595a66987..34402dd99 100644
--- a/isSafeInteger.js
+++ b/isSafeInteger.js
@@ -15,8 +15,7 @@ define(['./isInteger'], function(isInteger) {
    * @since 4.0.0
    * @category Lang
    * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a safe integer,
-   *  else `false`.
+   * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
    * @example
    *
    * _.isSafeInteger(3);
diff --git a/isString.js b/isString.js
index 4ab503f7c..da7c60bc5 100644
--- a/isString.js
+++ b/isString.js
@@ -8,7 +8,7 @@ define(['./isArray', './isObjectLike'], function(isArray, isObjectLike) {
 
   /**
    * 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;
diff --git a/isSymbol.js b/isSymbol.js
index da9d9856f..0d14ec7b1 100644
--- a/isSymbol.js
+++ b/isSymbol.js
@@ -8,7 +8,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
diff --git a/isWeakSet.js b/isWeakSet.js
index bd594cde8..cfc56a646 100644
--- a/isWeakSet.js
+++ b/isWeakSet.js
@@ -8,7 +8,7 @@ define(['./isObjectLike'], function(isObjectLike) {
 
   /**
    * 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;
diff --git a/keys.js b/keys.js
index 5cdee8055..912be530a 100644
--- a/keys.js
+++ b/keys.js
@@ -1,10 +1,10 @@
-define(['./_baseHas', './_baseKeys', './_indexKeys', './isArrayLike', './_isIndex', './_isPrototype'], function(baseHas, baseKeys, indexKeys, isArrayLike, isIndex, isPrototype) {
+define(['./_arrayLikeKeys', './_baseKeys', './isArrayLike'], function(arrayLikeKeys, baseKeys, isArrayLike) {
 
   /**
    * 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
@@ -29,23 +29,7 @@ define(['./_baseHas', './_baseKeys', './_indexKeys', './isArrayLike', './_isInde
    * // => ['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);
   }
 
   return keys;
diff --git a/keysIn.js b/keysIn.js
index 879dfe9ac..2e0985bd1 100644
--- a/keysIn.js
+++ b/keysIn.js
@@ -1,10 +1,4 @@
-define(['./_baseKeysIn', './_indexKeys', './_isIndex', './_isPrototype'], function(baseKeysIn, indexKeys, isIndex, isPrototype) {
-
-  /** Used for built-in method references. */
-  var objectProto = Object.prototype;
-
-  /** Used to check objects for own properties. */
-  var hasOwnProperty = objectProto.hasOwnProperty;
+define(['./_arrayLikeKeys', './_baseKeysIn', './isArrayLike'], function(arrayLikeKeys, baseKeysIn, isArrayLike) {
 
   /**
    * Creates an array of the own and inherited enumerable property names of `object`.
@@ -30,23 +24,7 @@ define(['./_baseKeysIn', './_indexKeys', './_isIndex', './_isPrototype'], functi
    * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
    */
   function keysIn(object) {
-    var index = -1,
-        isProto = isPrototype(object),
-        props = baseKeysIn(object),
-        propsLength = props.length,
-        indexes = indexKeys(object),
-        skipIndexes = !!indexes,
-        result = indexes || [],
-        length = result.length;
-
-    while (++index < propsLength) {
-      var key = props[index];
-      if (!(skipIndexes && (key == 'length' || isIndex(key, length))) &&
-          !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
-        result.push(key);
-      }
-    }
-    return result;
+    return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
   }
 
   return keysIn;
diff --git a/main.js b/main.js
index c9c37e6a7..021fdd391 100644
--- a/main.js
+++ b/main.js
@@ -13,7 +13,7 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.14.1';
+  var VERSION = '4.14.2';
 
   /** Used as the size to enable large array optimizations. */
   var LARGE_ARRAY_SIZE = 200;
@@ -135,7 +135,7 @@
 
   /**
    * 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,
       reHasRegExpChar = RegExp(reRegExpChar.source);
@@ -158,7 +158,7 @@
 
   /**
    * Used to match
-   * [ES template delimiters](http://ecma-international.org/ecma-262/6.0/#sec-template-literal-lexical-components).
+   * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
    */
   var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
 
@@ -267,9 +267,9 @@
   var contextProps = [
     'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
     'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
-    'Promise', 'Reflect', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError',
-    'Uint8Array', 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
-    '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
+    'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
+    'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap', '_', 'clearTimeout',
+    'isFinite', 'parseInt', 'setTimeout'
   ];
 
   /** Used to make template sourceURLs easier to identify. */
@@ -1130,7 +1130,7 @@
   }
 
   /**
-   * 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.
@@ -1283,7 +1283,6 @@
 
     /** Built-in constructor references. */
     var Array = context.Array,
-        Date = context.Date,
         Error = context.Error,
         Math = context.Math,
         RegExp = context.RegExp,
@@ -1317,7 +1316,7 @@
 
     /**
      * 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;
@@ -1333,29 +1332,28 @@
 
     /** Built-in value references. */
     var Buffer = moduleExports ? context.Buffer : undefined,
-        Reflect = context.Reflect,
         Symbol = context.Symbol,
         Uint8Array = context.Uint8Array,
-        enumerate = Reflect ? Reflect.enumerate : undefined,
+        getPrototype = overArg(Object.getPrototypeOf, Object),
         iteratorSymbol = Symbol ? Symbol.iterator : undefined,
         objectCreate = context.Object.create,
         propertyIsEnumerable = objectProto.propertyIsEnumerable,
         splice = arrayProto.splice,
         spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined;
 
-    /** Built-in method references that are mockable. */
-    var clearTimeout = function(id) { return context.clearTimeout.call(root, id); },
-        setTimeout = function(func, wait) { return context.setTimeout.call(root, func, wait); };
+    /** Mocked built-ins. */
+    var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
+        ctxNow = context.Date && context.Date.now !== root.Date.now && context.Date.now,
+        ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
 
     /* Built-in method references for those with the same name as other `lodash` methods. */
     var nativeCeil = Math.ceil,
         nativeFloor = Math.floor,
-        nativeGetPrototype = Object.getPrototypeOf,
         nativeGetSymbols = Object.getOwnPropertySymbols,
         nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
         nativeIsFinite = context.isFinite,
         nativeJoin = arrayProto.join,
-        nativeKeys = Object.keys,
+        nativeKeys = overArg(Object.keys, Object),
         nativeMax = Math.max,
         nativeMin = Math.min,
         nativeParseInt = context.parseInt,
@@ -2202,6 +2200,31 @@
 
     /*------------------------------------------------------------------------*/
 
+    /**
+     * Creates an array of the enumerable property names of the array-like `value`.
+     *
+     * @private
+     * @param {*} value The value to query.
+     * @param {boolean} inherited Specify returning inherited property names.
+     * @returns {Array} Returns the array of property names.
+     */
+    function arrayLikeKeys(value, inherited) {
+      var result = (isArray(value) || isString(value) || isArguments(value))
+        ? baseTimes(value.length, String)
+        : [];
+
+      var length = result.length,
+          skipIndexes = !!length;
+
+      for (var key in value) {
+        if ((inherited || hasOwnProperty.call(value, key)) &&
+            !(skipIndexes && (key == 'length' || isIndex(key, length)))) {
+          result.push(key);
+        }
+      }
+      return result;
+    }
+
     /**
      * Used by `_.defaults` to customize its `_.assignIn` use.
      *
@@ -2238,7 +2261,7 @@
 
     /**
      * 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
@@ -2446,14 +2469,13 @@
       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;
         }
       }
@@ -2480,7 +2502,7 @@
      * @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') {
@@ -2825,12 +2847,7 @@
      * @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);
     }
 
     /**
@@ -3204,40 +3221,47 @@
     }
 
     /**
-     * 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 `_.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));
-      };
-    }
-
     /**
      * The base implementation of `_.lt` which doesn't coerce arguments.
      *
@@ -3322,7 +3346,7 @@
         return;
       }
       if (!(isArray(source) || isTypedArray(source))) {
-        var props = keysIn(source);
+        var props = baseKeysIn(source);
       }
       arrayEach(props || source, function(srcValue, key) {
         if (props) {
@@ -3689,6 +3713,9 @@
      * @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,
@@ -3697,20 +3724,19 @@
           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;
@@ -4003,7 +4029,7 @@
       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];
     }
 
     /**
@@ -4158,6 +4184,16 @@
       return (!start && end >= length) ? array : baseSlice(array, start, end);
     }
 
+    /**
+     * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
+     *
+     * @private
+     * @param {number|Object} id The timer id or timeout object of the timer to clear.
+     */
+    var clearTimeout = ctxClearTimeout || function(id) {
+      return root.clearTimeout(id);
+    };
+
     /**
      * Creates a clone of  `buffer`.
      *
@@ -4651,7 +4687,7 @@
     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) {
@@ -5339,7 +5375,7 @@
         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 + '');
 
@@ -5401,7 +5437,7 @@
       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;
         }
       }
@@ -5537,19 +5573,6 @@
       return arguments.length ? result(arguments[0], arguments[1]) : 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`.
      *
@@ -5598,15 +5621,6 @@
       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);
-
     /**
      * Creates an array of the own enumerable symbol properties of `object`.
      *
@@ -5819,23 +5833,6 @@
       }
     }
 
-    /**
-     * 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;
-    }
-
     /**
      * Inserts wrapper `details` in a comment at the top of the `source` body.
      *
@@ -6120,6 +6117,25 @@
       return objValue;
     }
 
+    /**
+     * 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;
+    }
+
     /**
      * Gets the parent value at `path` of `object`.
      *
@@ -6188,6 +6204,18 @@
       };
     }());
 
+    /**
+     * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
+     *
+     * @private
+     * @param {Function} func The function to delay.
+     * @param {number} wait The number of milliseconds to delay invocation.
+     * @returns {number|Object} Returns the timer id or timeout object.
+     */
+    var setTimeout = ctxSetTimeout || function(func, wait) {
+      return root.setTimeout(func, wait);
+    };
+
     /**
      * Sets the `toString` method of `wrapper` to mimic the source of `reference`
      * with wrapper details in a comment at the top of the source body.
@@ -6408,7 +6436,7 @@
 
     /**
      * Creates an array of `array` values not included in the other given arrays
-     * 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. The order of result values is determined by the
      * order they occur in the first array.
      *
@@ -6911,7 +6939,7 @@
 
     /**
      * Gets the index at which the first occurrence of `value` is found in `array`
-     * 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. If `fromIndex` is negative, it's used as the
      * offset from the end of `array`.
      *
@@ -6959,12 +6987,13 @@
      * // => [1, 2]
      */
     function initial(array) {
-      return dropRight(array, 1);
+      var length = array ? array.length : 0;
+      return length ? baseSlice(array, 0, -1) : [];
     }
 
     /**
      * Creates an array of unique values that are included in all given arrays
-     * 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. The order of result values is determined by the
      * order they occur in the first array.
      *
@@ -7168,7 +7197,7 @@
 
     /**
      * Removes all given values from `array` using
-     * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
      * for equality comparisons.
      *
      * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
@@ -7637,7 +7666,8 @@
      * // => [2, 3]
      */
     function tail(array) {
-      return drop(array, 1);
+      var length = array ? array.length : 0;
+      return length ? baseSlice(array, 1, length) : [];
     }
 
     /**
@@ -7794,7 +7824,7 @@
 
     /**
      * Creates an array of unique values, in order, from all given arrays using
-     * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
      * for equality comparisons.
      *
      * @static
@@ -7875,7 +7905,7 @@
 
     /**
      * Creates a duplicate-free version of an array, using
-     * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
      * for equality comparisons, in which only the first occurrence of each
      * element is kept.
      *
@@ -8020,7 +8050,7 @@
 
     /**
      * Creates an array excluding all given values using
-     * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
      * for equality comparisons.
      *
      * **Note:** Unlike `_.pull`, this method returns a new array.
@@ -8591,6 +8621,11 @@
      * Iteration is stopped once `predicate` returns falsey. The predicate is
      * invoked with three arguments: (value, index|key, collection).
      *
+     * **Note:** This method returns `true` for
+     * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
+     * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
+     * elements of empty collections.
+     *
      * @static
      * @memberOf _
      * @since 0.1.0
@@ -8908,7 +8943,7 @@
     /**
      * Checks if `value` is in `collection`. If `collection` is a string, it's
      * checked for a substring of `value`, otherwise
-     * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
      * is used for equality comparisons. If `fromIndex` is negative, it's used as
      * the offset from the end of `collection`.
      *
@@ -9376,7 +9411,7 @@
           return collection.size;
         }
       }
-      return keys(collection).length;
+      return baseKeys(collection).length;
     }
 
     /**
@@ -9488,9 +9523,9 @@
      * }, _.now());
      * // => Logs the number of milliseconds it took for the deferred invocation.
      */
-    function now() {
-      return Date.now();
-    }
+    var now = ctxNow || function() {
+      return root.Date.now();
+    };
 
     /*------------------------------------------------------------------------*/
 
@@ -10031,7 +10066,7 @@
      * **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
@@ -10331,7 +10366,7 @@
     /**
      * Creates a function that invokes `func` with the `this` binding of the
      * create function and an array of arguments much like
-     * [`Function#apply`](http://www.ecma-international.org/ecma-262/6.0/#sec-function.prototype.apply).
+     * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
      *
      * **Note:** This method is based on the
      * [spread operator](https://mdn.io/spread_operator).
@@ -10678,7 +10713,7 @@
 
     /**
      * 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
@@ -10858,7 +10893,7 @@
      * // => false
      */
     function isArrayLike(value) {
-      return value != null && isLength(getLength(value)) && !isFunction(value);
+      return value != null && isLength(value.length) && !isFunction(value);
     }
 
     /**
@@ -10958,8 +10993,7 @@
      * @since 0.1.0
      * @category Lang
      * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is a DOM element,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
      * @example
      *
      * _.isElement(document.body);
@@ -11017,12 +11051,14 @@
           return !value.size;
         }
       }
+      var isProto = isPrototype(value);
       for (var key in value) {
-        if (hasOwnProperty.call(value, key)) {
+        if (hasOwnProperty.call(value, key) &&
+            !(isProto && key == 'constructor')) {
           return false;
         }
       }
-      return !(nonEnumShadows && keys(value).length);
+      return !(nonEnumShadows && nativeKeys(value).length);
     }
 
     /**
@@ -11041,8 +11077,7 @@
      * @category Lang
      * @param {*} value The value to compare.
      * @param {*} other The other value to compare.
-     * @returns {boolean} Returns `true` if the values are equivalent,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
      * @example
      *
      * var object = { 'a': 1 };
@@ -11071,8 +11106,7 @@
      * @param {*} value The value to compare.
      * @param {*} other The other value to compare.
      * @param {Function} [customizer] The function to customize comparisons.
-     * @returns {boolean} Returns `true` if the values are equivalent,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
      * @example
      *
      * function isGreeting(value) {
@@ -11106,8 +11140,7 @@
      * @since 3.0.0
      * @category Lang
      * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is an error object,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
      * @example
      *
      * _.isError(new Error);
@@ -11135,8 +11168,7 @@
      * @since 0.1.0
      * @category Lang
      * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is a finite number,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
      * @example
      *
      * _.isFinite(3);
@@ -11213,16 +11245,15 @@
     /**
      * 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);
@@ -11244,7 +11275,7 @@
 
     /**
      * 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
@@ -11323,8 +11354,12 @@
      * Performs a partial deep comparison between `object` and `source` to
      * determine if `object` contains equivalent property values.
      *
-     * **Note:** This method supports comparing the same values as `_.isEqual`
-     * and is equivalent to `_.matches` when `source` is partially applied.
+     * **Note:** This method is equivalent to `_.matches` when `source` is
+     * partially applied.
+     *
+     * Partial comparisons will match empty array and empty object `source`
+     * values against any array or object value, respectively. See `_.isEqual`
+     * for a list of supported value comparisons.
      *
      * @static
      * @memberOf _
@@ -11537,8 +11572,7 @@
      * @since 0.8.0
      * @category Lang
      * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is a plain object,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
      * @example
      *
      * function Foo() {
@@ -11602,8 +11636,7 @@
      * @since 4.0.0
      * @category Lang
      * @param {*} value The value to check.
-     * @returns {boolean} Returns `true` if `value` is a safe integer,
-     *  else `false`.
+     * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
      * @example
      *
      * _.isSafeInteger(3);
@@ -11897,7 +11930,7 @@
      * Converts `value` to an integer.
      *
      * **Note:** This method is loosely based on
-     * [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
+     * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
      *
      * @static
      * @memberOf _
@@ -11931,7 +11964,7 @@
      * array-like object.
      *
      * **Note:** This method is based on
-     * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+     * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
      *
      * @static
      * @memberOf _
@@ -12160,13 +12193,7 @@
      * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
      */
     var assignIn = createAssigner(function(object, source) {
-      if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
-        copyObject(source, keysIn(source), object);
-        return;
-      }
-      for (var key in source) {
-        assignValue(object, key, source[key]);
-      }
+      copyObject(source, keysIn(source), object);
     });
 
     /**
@@ -12775,7 +12802,7 @@
      * 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
@@ -12800,23 +12827,7 @@
      * // => ['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);
     }
 
     /**
@@ -12843,23 +12854,7 @@
      * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
      */
     function keysIn(object) {
-      var index = -1,
-          isProto = isPrototype(object),
-          props = baseKeysIn(object),
-          propsLength = props.length,
-          indexes = indexKeys(object),
-          skipIndexes = !!indexes,
-          result = indexes || [],
-          length = result.length;
-
-      while (++index < propsLength) {
-        var key = props[index];
-        if (!(skipIndexes && (key == 'length' || isIndex(key, length))) &&
-            !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
-          result.push(key);
-        }
-      }
-      return result;
+      return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
     }
 
     /**
@@ -15039,8 +15034,12 @@
      * object and `source`, returning `true` if the given object has equivalent
      * property values, else `false`.
      *
-     * **Note:** The created function supports comparing the same values as
-     * `_.isEqual` is equivalent to `_.isMatch` with `source` partially applied.
+     * **Note:** The created function is equivalent to `_.isMatch` with `source`
+     * partially applied.
+     *
+     * Partial comparisons will match empty array and empty object `source`
+     * values against any array or object value, respectively. See `_.isEqual`
+     * for a list of supported value comparisons.
      *
      * @static
      * @memberOf _
@@ -15067,7 +15066,9 @@
      * value at `path` of a given object to `srcValue`, returning `true` if the
      * object value is equivalent, else `false`.
      *
-     * **Note:** This method supports comparing the same values as `_.isEqual`.
+     * **Note:** Partial comparisons will match empty array and empty object
+     * `srcValue` values against any array or object value, respectively. See
+     * `_.isEqual` for a list of supported value comparisons.
      *
      * @static
      * @memberOf _
diff --git a/matches.js b/matches.js
index 86bdf909e..03d4278b5 100644
--- a/matches.js
+++ b/matches.js
@@ -5,8 +5,12 @@ define(['./_baseClone', './_baseMatches'], function(baseClone, baseMatches) {
    * object and `source`, returning `true` if the given object has equivalent
    * property values, else `false`.
    *
-   * **Note:** The created function supports comparing the same values as
-   * `_.isEqual` is equivalent to `_.isMatch` with `source` partially applied.
+   * **Note:** The created function is equivalent to `_.isMatch` with `source`
+   * partially applied.
+   *
+   * Partial comparisons will match empty array and empty object `source`
+   * values against any array or object value, respectively. See `_.isEqual`
+   * for a list of supported value comparisons.
    *
    * @static
    * @memberOf _
diff --git a/matchesProperty.js b/matchesProperty.js
index 930e19eb7..8504ef7c5 100644
--- a/matchesProperty.js
+++ b/matchesProperty.js
@@ -5,7 +5,9 @@ define(['./_baseClone', './_baseMatchesProperty'], function(baseClone, baseMatch
    * value at `path` of a given object to `srcValue`, returning `true` if the
    * object value is equivalent, else `false`.
    *
-   * **Note:** This method supports comparing the same values as `_.isEqual`.
+   * **Note:** Partial comparisons will match empty array and empty object
+   * `srcValue` values against any array or object value, respectively. See
+   * `_.isEqual` for a list of supported value comparisons.
    *
    * @static
    * @memberOf _
diff --git a/memoize.js b/memoize.js
index 78e008a94..662b748f8 100644
--- a/memoize.js
+++ b/memoize.js
@@ -13,7 +13,7 @@ define(['./_MapCache'], function(MapCache) {
    * **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
diff --git a/now.js b/now.js
index 5c46c2c3d..99c6bb0f8 100644
--- a/now.js
+++ b/now.js
@@ -1,4 +1,4 @@
-define([], function() {
+define(['./_root'], function(root) {
 
   /**
    * Gets the timestamp of the number of milliseconds that have elapsed since
@@ -16,9 +16,9 @@ define([], function() {
    * }, _.now());
    * // => Logs the number of milliseconds it took for the deferred invocation.
    */
-  function now() {
-    return Date.now();
-  }
+  var now = function() {
+    return root.Date.now();
+  };
 
   return now;
 });
diff --git a/package.json b/package.json
index b2d9eeefb..34f2ef2ea 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash-amd",
-  "version": "4.14.1",
+  "version": "4.14.2",
   "description": "Lodash exported as AMD modules.",
   "keywords": "amd, modules, stdlib, util",
   "homepage": "https://lodash.com/custom-builds",
diff --git a/pull.js b/pull.js
index abdcbdf80..00ca545a3 100644
--- a/pull.js
+++ b/pull.js
@@ -2,7 +2,7 @@ define(['./_baseRest', './pullAll'], function(baseRest, pullAll) {
 
   /**
    * Removes all given values from `array` using
-   * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
    * for equality comparisons.
    *
    * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
diff --git a/size.js b/size.js
index 323255d6b..5f6b36d9d 100644
--- a/size.js
+++ b/size.js
@@ -1,4 +1,4 @@
-define(['./_getTag', './isArrayLike', './isObjectLike', './isString', './keys', './_stringSize'], function(getTag, isArrayLike, isObjectLike, isString, keys, stringSize) {
+define(['./_baseKeys', './_getTag', './isArrayLike', './isObjectLike', './isString', './_stringSize'], function(baseKeys, getTag, isArrayLike, isObjectLike, isString, stringSize) {
 
   /** `Object#toString` result references. */
   var mapTag = '[object Map]',
@@ -39,7 +39,7 @@ define(['./_getTag', './isArrayLike', './isObjectLike', './isString', './keys',
         return collection.size;
       }
     }
-    return keys(collection).length;
+    return baseKeys(collection).length;
   }
 
   return size;
diff --git a/spread.js b/spread.js
index 047fa6a7d..a2f2aa758 100644
--- a/spread.js
+++ b/spread.js
@@ -12,7 +12,7 @@ define(['./_apply', './_arrayPush', './_baseRest', './_castSlice', './toInteger'
   /**
    * Creates a function that invokes `func` with the `this` binding of the
    * create function and an array of arguments much like
-   * [`Function#apply`](http://www.ecma-international.org/ecma-262/6.0/#sec-function.prototype.apply).
+   * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
    *
    * **Note:** This method is based on the
    * [spread operator](https://mdn.io/spread_operator).
diff --git a/tail.js b/tail.js
index 086b8bb05..46081d966 100644
--- a/tail.js
+++ b/tail.js
@@ -1,4 +1,4 @@
-define(['./drop'], function(drop) {
+define(['./_baseSlice'], function(baseSlice) {
 
   /**
    * Gets all but the first element of `array`.
@@ -15,7 +15,8 @@ define(['./drop'], function(drop) {
    * // => [2, 3]
    */
   function tail(array) {
-    return drop(array, 1);
+    var length = array ? array.length : 0;
+    return length ? baseSlice(array, 1, length) : [];
   }
 
   return tail;
diff --git a/template.js b/template.js
index ee092d695..3325a89fc 100644
--- a/template.js
+++ b/template.js
@@ -10,7 +10,7 @@ define(['./_assignInDefaults', './assignInWith', './attempt', './_baseValues', '
 
   /**
    * Used to match
-   * [ES template delimiters](http://ecma-international.org/ecma-262/6.0/#sec-template-literal-lexical-components).
+   * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
    */
   var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
 
diff --git a/toInteger.js b/toInteger.js
index e29796b64..ef7e72a2d 100644
--- a/toInteger.js
+++ b/toInteger.js
@@ -4,7 +4,7 @@ define(['./toFinite'], function(toFinite) {
    * Converts `value` to an integer.
    *
    * **Note:** This method is loosely based on
-   * [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).
+   * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
    *
    * @static
    * @memberOf _
diff --git a/toLength.js b/toLength.js
index ca4ed1a99..927e6c298 100644
--- a/toLength.js
+++ b/toLength.js
@@ -8,7 +8,7 @@ define(['./_baseClamp', './toInteger'], function(baseClamp, toInteger) {
    * array-like object.
    *
    * **Note:** This method is based on
-   * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+   * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
    *
    * @static
    * @memberOf _
diff --git a/union.js b/union.js
index f517eed29..0cdfb0fb9 100644
--- a/union.js
+++ b/union.js
@@ -2,7 +2,7 @@ define(['./_baseFlatten', './_baseRest', './_baseUniq', './isArrayLikeObject'],
 
   /**
    * Creates an array of unique values, in order, from all given arrays using
-   * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
    * for equality comparisons.
    *
    * @static
diff --git a/uniq.js b/uniq.js
index ec97cafcc..927a24933 100644
--- a/uniq.js
+++ b/uniq.js
@@ -2,7 +2,7 @@ define(['./_baseUniq'], function(baseUniq) {
 
   /**
    * Creates a duplicate-free version of an array, using
-   * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
    * for equality comparisons, in which only the first occurrence of each
    * element is kept.
    *
diff --git a/without.js b/without.js
index b6dcc53cd..d4545e9d8 100644
--- a/without.js
+++ b/without.js
@@ -2,7 +2,7 @@ define(['./_baseDifference', './_baseRest', './isArrayLikeObject'], function(bas
 
   /**
    * Creates an array excluding all given values using
-   * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+   * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
    * for equality comparisons.
    *
    * **Note:** Unlike `_.pull`, this method returns a new array.