diff --git a/README.md b/README.md
index 2052e053f..3b053df63 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,12 @@
-# lodash v4.15.0
+# lodash v4.16.0
 
 The [Lodash](https://lodash.com/) library exported as [Node.js](https://nodejs.org/) modules.
 
 ## Installation
 
 Using npm:
-```bash
-$ {sudo -H} npm i -g npm
+```shell
+$ npm i -g npm
 $ npm i --save lodash
 ```
 
@@ -16,25 +16,24 @@ In Node.js:
 var _ = require('lodash');
 // Load the core build.
 var _ = require('lodash/core');
-// Load the fp build for immutable auto-curried iteratee-first data-last methods.
+// Load the FP build for immutable auto-curried iteratee-first data-last methods.
 var fp = require('lodash/fp');
 
-// Load a method category.
+// Load method categories.
 var array = require('lodash/array');
 var object = require('lodash/fp/object');
 
-// Load a single method for smaller builds with browserify/rollup/webpack.
+// Cherry-pick methods for smaller browserify/rollup/webpack bundles.
 var chunk = require('lodash/chunk');
 var extend = require('lodash/fp/extend');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.15.0-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.16.0-npm) for more details.
 
 **Note:**<br>
-Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` in the Node.js < 6 REPL.<br>
-Install [n_](https://www.npmjs.com/package/n_) for a REPL that includes `lodash` by default.
+Install [n_](https://www.npmjs.com/package/n_) for Lodash use in the Node.js < 6 REPL.
 
 ## Support
 
-Tested in Chrome 51-52, Firefox 47-48, IE 9-11, Edge 14, Safari 8-9, Node.js 0.10-6, & PhantomJS 2.1.1.<br>
+Tested in Chrome 52-53, Firefox 47-48, IE 11, Edge 14, Safari 8-9, Node.js 4-6, & PhantomJS 2.1.1.<br>
 Automated [browser](https://saucelabs.com/u/lodash) & [CI](https://travis-ci.org/lodash/lodash/) test runs are available.
diff --git a/_Stack.js b/_Stack.js
index b9ba1af3e..80b2cf1b0 100644
--- a/_Stack.js
+++ b/_Stack.js
@@ -13,7 +13,8 @@ var ListCache = require('./_ListCache'),
  * @param {Array} [entries] The key-value pairs to cache.
  */
 function Stack(entries) {
-  this.__data__ = new ListCache(entries);
+  var data = this.__data__ = new ListCache(entries);
+  this.size = data.size;
 }
 
 // Add methods to `Stack`.
diff --git a/_arraySample.js b/_arraySample.js
new file mode 100644
index 000000000..bcc2f5965
--- /dev/null
+++ b/_arraySample.js
@@ -0,0 +1,16 @@
+var baseRandom = require('./_baseRandom');
+
+/**
+ * A specialized version of `_.sample` for arrays without support for iteratee
+ * shorthands.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @returns {*} Returns the random element.
+ */
+function arraySample(array) {
+  var length = array.length;
+  return length ? array[baseRandom(0, length - 1)] : undefined;
+}
+
+module.exports = arraySample;
diff --git a/_arraySampleSize.js b/_arraySampleSize.js
new file mode 100644
index 000000000..1e452c552
--- /dev/null
+++ b/_arraySampleSize.js
@@ -0,0 +1,18 @@
+var arrayShuffle = require('./_arrayShuffle'),
+    baseClamp = require('./_baseClamp');
+
+/**
+ * A specialized version of `_.sampleSize` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to sample.
+ * @param {number} n The number of elements to sample.
+ * @returns {Array} Returns the random elements.
+ */
+function arraySampleSize(array, n) {
+  var result = arrayShuffle(array);
+  result.length = baseClamp(n, 0, result.length);
+  return result;
+}
+
+module.exports = arraySampleSize;
diff --git a/_arrayShuffle.js b/_arrayShuffle.js
new file mode 100644
index 000000000..46313a39b
--- /dev/null
+++ b/_arrayShuffle.js
@@ -0,0 +1,15 @@
+var copyArray = require('./_copyArray'),
+    shuffleSelf = require('./_shuffleSelf');
+
+/**
+ * A specialized version of `_.shuffle` for arrays.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @returns {Array} Returns the new shuffled array.
+ */
+function arrayShuffle(array) {
+  return shuffleSelf(copyArray(array));
+}
+
+module.exports = arrayShuffle;
diff --git a/_assignMergeValue.js b/_assignMergeValue.js
index 61dd58329..fe8987556 100644
--- a/_assignMergeValue.js
+++ b/_assignMergeValue.js
@@ -1,4 +1,5 @@
-var eq = require('./eq');
+var baseAssignValue = require('./_baseAssignValue'),
+    eq = require('./eq');
 
 /**
  * This function is like `assignValue` except that it doesn't assign
@@ -12,7 +13,7 @@ var eq = require('./eq');
 function assignMergeValue(object, key, value) {
   if ((value !== undefined && !eq(object[key], value)) ||
       (typeof key == 'number' && value === undefined && !(key in object))) {
-    object[key] = value;
+    baseAssignValue(object, key, value);
   }
 }
 
diff --git a/_assignValue.js b/_assignValue.js
index aa1dc78e1..40839575b 100644
--- a/_assignValue.js
+++ b/_assignValue.js
@@ -1,4 +1,5 @@
-var eq = require('./eq');
+var baseAssignValue = require('./_baseAssignValue'),
+    eq = require('./eq');
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
@@ -20,7 +21,7 @@ function assignValue(object, key, value) {
   var objValue = object[key];
   if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
       (value === undefined && !(key in object))) {
-    object[key] = value;
+    baseAssignValue(object, key, value);
   }
 }
 
diff --git a/_baseAssignValue.js b/_baseAssignValue.js
new file mode 100644
index 000000000..0a937450a
--- /dev/null
+++ b/_baseAssignValue.js
@@ -0,0 +1,26 @@
+/** Built-in value references. */
+var defineProperty = Object.defineProperty;
+
+/**
+ * The base implementation of `assignValue` and `assignMergeValue` without
+ * value checks.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function baseAssignValue(object, key, value) {
+  if (key == '__proto__' && defineProperty) {
+    defineProperty(object, key, {
+      'configurable': true,
+      'enumerable': true,
+      'value': value,
+      'writable': true
+    });
+  } else {
+    object[key] = value;
+  }
+}
+
+module.exports = baseAssignValue;
diff --git a/_baseClone.js b/_baseClone.js
index fce3c0c08..8ac0fec20 100644
--- a/_baseClone.js
+++ b/_baseClone.js
@@ -12,7 +12,6 @@ var Stack = require('./_Stack'),
     initCloneObject = require('./_initCloneObject'),
     isArray = require('./isArray'),
     isBuffer = require('./isBuffer'),
-    isHostObject = require('./_isHostObject'),
     isObject = require('./isObject'),
     keys = require('./keys');
 
@@ -100,9 +99,6 @@ function baseClone(value, isDeep, isFull, customizer, key, object, stack) {
       return cloneBuffer(value, isDeep);
     }
     if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
-      if (isHostObject(value)) {
-        return object ? value : {};
-      }
       result = initCloneObject(isFunc ? {} : value);
       if (!isDeep) {
         return copySymbols(value, baseAssign(result, value));
diff --git a/_baseIndexOf.js b/_baseIndexOf.js
index c232d4330..167e706e7 100644
--- a/_baseIndexOf.js
+++ b/_baseIndexOf.js
@@ -1,5 +1,6 @@
 var baseFindIndex = require('./_baseFindIndex'),
-    baseIsNaN = require('./_baseIsNaN');
+    baseIsNaN = require('./_baseIsNaN'),
+    strictIndexOf = require('./_strictIndexOf');
 
 /**
  * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
@@ -11,18 +12,9 @@ var baseFindIndex = require('./_baseFindIndex'),
  * @returns {number} Returns the index of the matched value, else `-1`.
  */
 function baseIndexOf(array, value, fromIndex) {
-  if (value !== value) {
-    return baseFindIndex(array, baseIsNaN, fromIndex);
-  }
-  var index = fromIndex - 1,
-      length = array.length;
-
-  while (++index < length) {
-    if (array[index] === value) {
-      return index;
-    }
-  }
-  return -1;
+  return value === value
+    ? strictIndexOf(array, value, fromIndex)
+    : baseFindIndex(array, baseIsNaN, fromIndex);
 }
 
 module.exports = baseIndexOf;
diff --git a/_baseIsEqualDeep.js b/_baseIsEqualDeep.js
index c18d6d1fc..8d9a49fc6 100644
--- a/_baseIsEqualDeep.js
+++ b/_baseIsEqualDeep.js
@@ -4,7 +4,6 @@ var Stack = require('./_Stack'),
     equalObjects = require('./_equalObjects'),
     getTag = require('./_getTag'),
     isArray = require('./isArray'),
-    isHostObject = require('./_isHostObject'),
     isTypedArray = require('./isTypedArray');
 
 /** Used to compose bitmasks for comparison styles. */
@@ -50,8 +49,8 @@ function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {
     othTag = getTag(other);
     othTag = othTag == argsTag ? objectTag : othTag;
   }
-  var objIsObj = objTag == objectTag && !isHostObject(object),
-      othIsObj = othTag == objectTag && !isHostObject(other),
+  var objIsObj = objTag == objectTag,
+      othIsObj = othTag == objectTag,
       isSameTag = objTag == othTag;
 
   if (isSameTag && !objIsObj) {
diff --git a/_baseIsNative.js b/_baseIsNative.js
index c79c77ccb..870233049 100644
--- a/_baseIsNative.js
+++ b/_baseIsNative.js
@@ -1,5 +1,4 @@
 var isFunction = require('./isFunction'),
-    isHostObject = require('./_isHostObject'),
     isMasked = require('./_isMasked'),
     isObject = require('./isObject'),
     toSource = require('./_toSource');
@@ -41,7 +40,7 @@ function baseIsNative(value) {
   if (!isObject(value) || isMasked(value)) {
     return false;
   }
-  var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
+  var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
   return pattern.test(toSource(value));
 }
 
diff --git a/_basePickBy.js b/_basePickBy.js
index fcc66105a..dc9b342e8 100644
--- a/_basePickBy.js
+++ b/_basePickBy.js
@@ -1,3 +1,5 @@
+var baseAssignValue = require('./_baseAssignValue');
+
 /**
  * The base implementation of  `_.pickBy` without support for iteratee shorthands.
  *
@@ -17,7 +19,7 @@ function basePickBy(object, props, predicate) {
         value = object[key];
 
     if (predicate(value, key)) {
-      result[key] = value;
+      baseAssignValue(result, key, value);
     }
   }
   return result;
diff --git a/_baseRest.js b/_baseRest.js
index d8aa217c6..d0dc4bdd1 100644
--- a/_baseRest.js
+++ b/_baseRest.js
@@ -1,7 +1,6 @@
-var apply = require('./_apply');
-
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeMax = Math.max;
+var identity = require('./identity'),
+    overRest = require('./_overRest'),
+    setToString = require('./_setToString');
 
 /**
  * The base implementation of `_.rest` which doesn't validate or coerce arguments.
@@ -12,24 +11,7 @@ var nativeMax = Math.max;
  * @returns {Function} Returns the new function.
  */
 function baseRest(func, start) {
-  start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
-  return function() {
-    var args = arguments,
-        index = -1,
-        length = nativeMax(args.length - start, 0),
-        array = Array(length);
-
-    while (++index < length) {
-      array[index] = args[start + index];
-    }
-    index = -1;
-    var otherArgs = Array(start + 1);
-    while (++index < start) {
-      otherArgs[index] = args[index];
-    }
-    otherArgs[start] = array;
-    return apply(func, this, otherArgs);
-  };
+  return setToString(overRest(func, start, identity), func + '');
 }
 
 module.exports = baseRest;
diff --git a/_baseSetData.js b/_baseSetData.js
index e689df2cc..c409947dd 100644
--- a/_baseSetData.js
+++ b/_baseSetData.js
@@ -2,7 +2,7 @@ var identity = require('./identity'),
     metaMap = require('./_metaMap');
 
 /**
- * The base implementation of `setData` without support for hot loop detection.
+ * The base implementation of `setData` without support for hot loop shorting.
  *
  * @private
  * @param {Function} func The function to associate metadata with.
diff --git a/_baseSetToString.js b/_baseSetToString.js
new file mode 100644
index 000000000..224a65af3
--- /dev/null
+++ b/_baseSetToString.js
@@ -0,0 +1,22 @@
+var constant = require('./constant'),
+    identity = require('./identity'),
+    nativeDefineProperty = require('./_nativeDefineProperty');
+
+/**
+ * The base implementation of `setToString` without support for hot loop shorting.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The `toString` result.
+ * @returns {Function} Returns `func`.
+ */
+var baseSetToString = !nativeDefineProperty ? identity : function(func, string) {
+  return nativeDefineProperty(func, 'toString', {
+    'configurable': true,
+    'enumerable': false,
+    'value': constant(string),
+    'writable': true
+  });
+};
+
+module.exports = baseSetToString;
diff --git a/_cacheHas.js b/_cacheHas.js
index c4c6b6504..2dec89268 100644
--- a/_cacheHas.js
+++ b/_cacheHas.js
@@ -1,5 +1,5 @@
 /**
- * Checks if a cache value for `key` exists.
+ * Checks if a `cache` value for `key` exists.
  *
  * @private
  * @param {Object} cache The cache to query.
diff --git a/_castRest.js b/_castRest.js
new file mode 100644
index 000000000..213c66f19
--- /dev/null
+++ b/_castRest.js
@@ -0,0 +1,14 @@
+var baseRest = require('./_baseRest');
+
+/**
+ * A `baseRest` alias which can be replaced with `identity` by module
+ * replacement plugins.
+ *
+ * @private
+ * @type {Function}
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+var castRest = baseRest;
+
+module.exports = castRest;
diff --git a/_copyObject.js b/_copyObject.js
index 7d267b2e5..2f2a5c23b 100644
--- a/_copyObject.js
+++ b/_copyObject.js
@@ -1,4 +1,5 @@
-var assignValue = require('./_assignValue');
+var assignValue = require('./_assignValue'),
+    baseAssignValue = require('./_baseAssignValue');
 
 /**
  * Copies properties of `source` to `object`.
@@ -11,6 +12,7 @@ var assignValue = require('./_assignValue');
  * @returns {Object} Returns `object`.
  */
 function copyObject(source, props, object, customizer) {
+  var isNew = !object;
   object || (object = {});
 
   var index = -1,
@@ -23,7 +25,14 @@ function copyObject(source, props, object, customizer) {
       ? customizer(object[key], source[key], key, object, source)
       : undefined;
 
-    assignValue(object, key, newValue === undefined ? source[key] : newValue);
+    if (newValue === undefined) {
+      newValue = source[key];
+    }
+    if (isNew) {
+      baseAssignValue(object, key, newValue);
+    } else {
+      assignValue(object, key, newValue);
+    }
   }
   return object;
 }
diff --git a/_countHolders.js b/_countHolders.js
index 8cc95e6e0..718fcdaa8 100644
--- a/_countHolders.js
+++ b/_countHolders.js
@@ -12,7 +12,7 @@ function countHolders(array, placeholder) {
 
   while (length--) {
     if (array[length] === placeholder) {
-      result++;
+      ++result;
     }
   }
   return result;
diff --git a/_createFlow.js b/_createFlow.js
index 911aaf15c..56de0b269 100644
--- a/_createFlow.js
+++ b/_createFlow.js
@@ -1,6 +1,5 @@
 var LodashWrapper = require('./_LodashWrapper'),
-    baseFlatten = require('./_baseFlatten'),
-    baseRest = require('./_baseRest'),
+    flatRest = require('./_flatRest'),
     getData = require('./_getData'),
     getFuncName = require('./_getFuncName'),
     isArray = require('./isArray'),
@@ -26,9 +25,7 @@ var CURRY_FLAG = 8,
  * @returns {Function} Returns the new flow function.
  */
 function createFlow(fromRight) {
-  return baseRest(function(funcs) {
-    funcs = baseFlatten(funcs, 1);
-
+  return flatRest(function(funcs) {
     var length = funcs.length,
         index = length,
         prereq = LodashWrapper.prototype.thru;
diff --git a/_createOver.js b/_createOver.js
index 723182dc1..3b9455161 100644
--- a/_createOver.js
+++ b/_createOver.js
@@ -1,10 +1,9 @@
 var apply = require('./_apply'),
     arrayMap = require('./_arrayMap'),
-    baseFlatten = require('./_baseFlatten'),
     baseIteratee = require('./_baseIteratee'),
     baseRest = require('./_baseRest'),
     baseUnary = require('./_baseUnary'),
-    isArray = require('./isArray');
+    flatRest = require('./_flatRest');
 
 /**
  * Creates a function like `_.over`.
@@ -14,11 +13,8 @@ var apply = require('./_apply'),
  * @returns {Function} Returns the new over function.
  */
 function createOver(arrayFunc) {
-  return baseRest(function(iteratees) {
-    iteratees = (iteratees.length == 1 && isArray(iteratees[0]))
-      ? arrayMap(iteratees[0], baseUnary(baseIteratee))
-      : arrayMap(baseFlatten(iteratees, 1), baseUnary(baseIteratee));
-
+  return flatRest(function(iteratees) {
+    iteratees = arrayMap(iteratees, baseUnary(baseIteratee));
     return baseRest(function(args) {
       var thisArg = this;
       return arrayFunc(iteratees, function(iteratee) {
diff --git a/_deburrLetter.js b/_deburrLetter.js
index 98283a467..3e531edcf 100644
--- a/_deburrLetter.js
+++ b/_deburrLetter.js
@@ -55,7 +55,7 @@ var deburredLetters = {
   '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
   '\u0132': 'IJ', '\u0133': 'ij',
   '\u0152': 'Oe', '\u0153': 'oe',
-  '\u0149': "'n", '\u017f': 'ss'
+  '\u0149': "'n", '\u017f': 's'
 };
 
 /**
diff --git a/_defineProperty.js b/_defineProperty.js
deleted file mode 100644
index f6128d776..000000000
--- a/_defineProperty.js
+++ /dev/null
@@ -1,11 +0,0 @@
-var getNative = require('./_getNative');
-
-/* Used to set `toString` methods. */
-var defineProperty = (function() {
-  var func = getNative(Object, 'defineProperty'),
-      name = getNative.name;
-
-  return (name && name.length > 2) ? func : undefined;
-}());
-
-module.exports = defineProperty;
diff --git a/_equalArrays.js b/_equalArrays.js
index e095170ce..178dcedf2 100644
--- a/_equalArrays.js
+++ b/_equalArrays.js
@@ -1,5 +1,6 @@
 var SetCache = require('./_SetCache'),
-    arraySome = require('./_arraySome');
+    arraySome = require('./_arraySome'),
+    cacheHas = require('./_cacheHas');
 
 /** Used to compose bitmasks for comparison styles. */
 var UNORDERED_COMPARE_FLAG = 1,
@@ -59,9 +60,9 @@ function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
     // Recursively compare arrays (susceptible to call stack limits).
     if (seen) {
       if (!arraySome(other, function(othValue, othIndex) {
-            if (!seen.has(othIndex) &&
+            if (!cacheHas(seen, othIndex) &&
                 (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
-              return seen.add(othIndex);
+              return seen.push(othIndex);
             }
           })) {
         result = false;
diff --git a/_escapeHtmlChar.js b/_escapeHtmlChar.js
index 6abceb51c..7ca68ee62 100644
--- a/_escapeHtmlChar.js
+++ b/_escapeHtmlChar.js
@@ -6,8 +6,7 @@ var htmlEscapes = {
   '<': '&lt;',
   '>': '&gt;',
   '"': '&quot;',
-  "'": '&#39;',
-  '`': '&#96;'
+  "'": '&#39;'
 };
 
 /**
diff --git a/_flatRest.js b/_flatRest.js
new file mode 100644
index 000000000..94ab6cca7
--- /dev/null
+++ b/_flatRest.js
@@ -0,0 +1,16 @@
+var flatten = require('./flatten'),
+    overRest = require('./_overRest'),
+    setToString = require('./_setToString');
+
+/**
+ * A specialized version of `baseRest` which flattens the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @returns {Function} Returns the new function.
+ */
+function flatRest(func) {
+  return setToString(overRest(func, undefined, flatten), func + '');
+}
+
+module.exports = flatRest;
diff --git a/_getTag.js b/_getTag.js
index de560d676..6954db1b6 100644
--- a/_getTag.js
+++ b/_getTag.js
@@ -41,8 +41,7 @@ var dataViewCtorString = toSource(DataView),
  */
 var getTag = baseGetTag;
 
-// Fallback for data views, maps, sets, and weak maps in IE 11,
-// for data views in Edge < 14, and promises in Node.js.
+// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
 if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
     (Map && getTag(new Map) != mapTag) ||
     (Promise && getTag(Promise.resolve()) != promiseTag) ||
diff --git a/_hasPath.js b/_hasPath.js
index 1e2c3eac4..770be4b88 100644
--- a/_hasPath.js
+++ b/_hasPath.js
@@ -18,9 +18,9 @@ var castPath = require('./_castPath'),
 function hasPath(object, path, hasFunc) {
   path = isKey(path, object) ? [path] : castPath(path);
 
-  var result,
-      index = -1,
-      length = path.length;
+  var index = -1,
+      length = path.length,
+      result = false;
 
   while (++index < length) {
     var key = toKey(path[index]);
@@ -29,10 +29,10 @@ function hasPath(object, path, hasFunc) {
     }
     object = object[key];
   }
-  if (result) {
+  if (result || ++index != length) {
     return result;
   }
-  var length = object ? object.length : 0;
+  length = object ? object.length : 0;
   return !!length && isLength(length) && isIndex(key, length) &&
     (isArray(object) || isArguments(object));
 }
diff --git a/_hashClear.js b/_hashClear.js
index 14c159176..5d4b70cc4 100644
--- a/_hashClear.js
+++ b/_hashClear.js
@@ -9,6 +9,7 @@ var nativeCreate = require('./_nativeCreate');
  */
 function hashClear() {
   this.__data__ = nativeCreate ? nativeCreate(null) : {};
+  this.size = 0;
 }
 
 module.exports = hashClear;
diff --git a/_hashDelete.js b/_hashDelete.js
index 45b39fb00..ea9dabf13 100644
--- a/_hashDelete.js
+++ b/_hashDelete.js
@@ -9,7 +9,9 @@
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function hashDelete(key) {
-  return this.has(key) && delete this.__data__[key];
+  var result = this.has(key) && delete this.__data__[key];
+  this.size -= result ? 1 : 0;
+  return result;
 }
 
 module.exports = hashDelete;
diff --git a/_hashSet.js b/_hashSet.js
index 56fec1eb2..e1055283e 100644
--- a/_hashSet.js
+++ b/_hashSet.js
@@ -15,6 +15,7 @@ var HASH_UNDEFINED = '__lodash_hash_undefined__';
  */
 function hashSet(key, value) {
   var data = this.__data__;
+  this.size += this.has(key) ? 0 : 1;
   data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
   return this;
 }
diff --git a/_insertWrapDetails.js b/_insertWrapDetails.js
index 191f226de..e79080864 100644
--- a/_insertWrapDetails.js
+++ b/_insertWrapDetails.js
@@ -10,9 +10,11 @@ var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/;
  * @returns {string} Returns the modified source.
  */
 function insertWrapDetails(source, details) {
-  var length = details.length,
-      lastIndex = length - 1;
-
+  var length = details.length;
+  if (!length) {
+    return source;
+  }
+  var lastIndex = length - 1;
   details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
   details = details.join(length > 2 ? ', ' : ' ');
   return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
diff --git a/_isHostObject.js b/_isHostObject.js
deleted file mode 100644
index e598c10e3..000000000
--- a/_isHostObject.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Checks if `value` is a host object in IE < 9.
- *
- * @private
- * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
- */
-function isHostObject(value) {
-  // Many host objects are `Object` objects that can coerce to strings
-  // despite having improperly defined `toString` methods.
-  var result = false;
-  if (value != null && typeof value.toString != 'function') {
-    try {
-      result = !!(value + '');
-    } catch (e) {}
-  }
-  return result;
-}
-
-module.exports = isHostObject;
diff --git a/_listCacheClear.js b/_listCacheClear.js
index e4e132581..acbe39a59 100644
--- a/_listCacheClear.js
+++ b/_listCacheClear.js
@@ -7,6 +7,7 @@
  */
 function listCacheClear() {
   this.__data__ = [];
+  this.size = 0;
 }
 
 module.exports = listCacheClear;
diff --git a/_listCacheDelete.js b/_listCacheDelete.js
index 2f3232836..b1384ade9 100644
--- a/_listCacheDelete.js
+++ b/_listCacheDelete.js
@@ -28,6 +28,7 @@ function listCacheDelete(key) {
   } else {
     splice.call(data, index, 1);
   }
+  --this.size;
   return true;
 }
 
diff --git a/_listCacheSet.js b/_listCacheSet.js
index e2f13b6be..5855c95e4 100644
--- a/_listCacheSet.js
+++ b/_listCacheSet.js
@@ -15,6 +15,7 @@ function listCacheSet(key, value) {
       index = assocIndexOf(data, key);
 
   if (index < 0) {
+    ++this.size;
     data.push([key, value]);
   } else {
     data[index][1] = value;
diff --git a/_mapCacheClear.js b/_mapCacheClear.js
index edb42b5f5..bc9ca204a 100644
--- a/_mapCacheClear.js
+++ b/_mapCacheClear.js
@@ -10,6 +10,7 @@ var Hash = require('./_Hash'),
  * @memberOf MapCache
  */
 function mapCacheClear() {
+  this.size = 0;
   this.__data__ = {
     'hash': new Hash,
     'map': new (Map || ListCache),
diff --git a/_mapCacheDelete.js b/_mapCacheDelete.js
index 08f1c2efe..946ca3c93 100644
--- a/_mapCacheDelete.js
+++ b/_mapCacheDelete.js
@@ -10,7 +10,9 @@ var getMapData = require('./_getMapData');
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function mapCacheDelete(key) {
-  return getMapData(this, key)['delete'](key);
+  var result = getMapData(this, key)['delete'](key);
+  this.size -= result ? 1 : 0;
+  return result;
 }
 
 module.exports = mapCacheDelete;
diff --git a/_mapCacheSet.js b/_mapCacheSet.js
index 0ef1eafd8..734684927 100644
--- a/_mapCacheSet.js
+++ b/_mapCacheSet.js
@@ -11,7 +11,11 @@ var getMapData = require('./_getMapData');
  * @returns {Object} Returns the map cache instance.
  */
 function mapCacheSet(key, value) {
-  getMapData(this, key).set(key, value);
+  var data = getMapData(this, key),
+      size = data.size;
+
+  data.set(key, value);
+  this.size += data.size == size ? 0 : 1;
   return this;
 }
 
diff --git a/_memoizeCapped.js b/_memoizeCapped.js
new file mode 100644
index 000000000..7f71c8fba
--- /dev/null
+++ b/_memoizeCapped.js
@@ -0,0 +1,26 @@
+var memoize = require('./memoize');
+
+/** Used as the maximum memoize cache size. */
+var MAX_MEMOIZE_SIZE = 500;
+
+/**
+ * A specialized version of `_.memoize` which clears the memoized function's
+ * cache when it exceeds `MAX_MEMOIZE_SIZE`.
+ *
+ * @private
+ * @param {Function} func The function to have its output memoized.
+ * @returns {Function} Returns the new memoized function.
+ */
+function memoizeCapped(func) {
+  var result = memoize(func, function(key) {
+    if (cache.size === MAX_MEMOIZE_SIZE) {
+      cache.clear();
+    }
+    return key;
+  });
+
+  var cache = result.cache;
+  return result;
+}
+
+module.exports = memoizeCapped;
diff --git a/_nativeDefineProperty.js b/_nativeDefineProperty.js
new file mode 100644
index 000000000..38ed486a7
--- /dev/null
+++ b/_nativeDefineProperty.js
@@ -0,0 +1,6 @@
+var getNative = require('./_getNative');
+
+/* Built-in method references that are verified to be native. */
+var nativeDefineProperty = getNative(Object, 'defineProperty');
+
+module.exports = nativeDefineProperty;
diff --git a/_overRest.js b/_overRest.js
new file mode 100644
index 000000000..c7cdef339
--- /dev/null
+++ b/_overRest.js
@@ -0,0 +1,36 @@
+var apply = require('./_apply');
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
+
+/**
+ * A specialized version of `baseRest` which transforms the rest array.
+ *
+ * @private
+ * @param {Function} func The function to apply a rest parameter to.
+ * @param {number} [start=func.length-1] The start position of the rest parameter.
+ * @param {Function} transform The rest array transform.
+ * @returns {Function} Returns the new function.
+ */
+function overRest(func, start, transform) {
+  start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+  return function() {
+    var args = arguments,
+        index = -1,
+        length = nativeMax(args.length - start, 0),
+        array = Array(length);
+
+    while (++index < length) {
+      array[index] = args[start + index];
+    }
+    index = -1;
+    var otherArgs = Array(start + 1);
+    while (++index < start) {
+      otherArgs[index] = args[index];
+    }
+    otherArgs[start] = transform(array);
+    return apply(func, this, otherArgs);
+  };
+}
+
+module.exports = overRest;
diff --git a/_setData.js b/_setData.js
index d86c61086..e5cf3eb96 100644
--- a/_setData.js
+++ b/_setData.js
@@ -1,9 +1,5 @@
 var baseSetData = require('./_baseSetData'),
-    now = require('./now');
-
-/** Used to detect hot functions by number of calls within a span of milliseconds. */
-var HOT_COUNT = 150,
-    HOT_SPAN = 16;
+    shortOut = require('./_shortOut');
 
 /**
  * Sets metadata for `func`.
@@ -19,24 +15,6 @@ var HOT_COUNT = 150,
  * @param {*} data The metadata.
  * @returns {Function} Returns `func`.
  */
-var setData = (function() {
-  var count = 0,
-      lastCalled = 0;
-
-  return function(key, value) {
-    var stamp = now(),
-        remaining = HOT_SPAN - (stamp - lastCalled);
-
-    lastCalled = stamp;
-    if (remaining > 0) {
-      if (++count >= HOT_COUNT) {
-        return key;
-      }
-    } else {
-      count = 0;
-    }
-    return baseSetData(key, value);
-  };
-}());
+var setData = shortOut(baseSetData);
 
 module.exports = setData;
diff --git a/_setToString.js b/_setToString.js
new file mode 100644
index 000000000..6ca841967
--- /dev/null
+++ b/_setToString.js
@@ -0,0 +1,14 @@
+var baseSetToString = require('./_baseSetToString'),
+    shortOut = require('./_shortOut');
+
+/**
+ * Sets the `toString` method of `func` to return `string`.
+ *
+ * @private
+ * @param {Function} func The function to modify.
+ * @param {Function} string The `toString` result.
+ * @returns {Function} Returns `func`.
+ */
+var setToString = shortOut(baseSetToString);
+
+module.exports = setToString;
diff --git a/_setWrapToString.js b/_setWrapToString.js
index 3c53cd0fc..decdc4499 100644
--- a/_setWrapToString.js
+++ b/_setWrapToString.js
@@ -1,8 +1,6 @@
-var constant = require('./constant'),
-    defineProperty = require('./_defineProperty'),
-    getWrapDetails = require('./_getWrapDetails'),
-    identity = require('./identity'),
+var getWrapDetails = require('./_getWrapDetails'),
     insertWrapDetails = require('./_insertWrapDetails'),
+    setToString = require('./_setToString'),
     updateWrapDetails = require('./_updateWrapDetails');
 
 /**
@@ -15,13 +13,9 @@ var constant = require('./constant'),
  * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  * @returns {Function} Returns `wrapper`.
  */
-var setWrapToString = !defineProperty ? identity : function(wrapper, reference, bitmask) {
+function setWrapToString(wrapper, reference, bitmask) {
   var source = (reference + '');
-  return defineProperty(wrapper, 'toString', {
-    'configurable': true,
-    'enumerable': false,
-    'value': constant(insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)))
-  });
-};
+  return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+}
 
 module.exports = setWrapToString;
diff --git a/_shortOut.js b/_shortOut.js
new file mode 100644
index 000000000..a4e6507fb
--- /dev/null
+++ b/_shortOut.js
@@ -0,0 +1,37 @@
+/** Used to detect hot functions by number of calls within a span of milliseconds. */
+var HOT_COUNT = 500,
+    HOT_SPAN = 16;
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeNow = Date.now;
+
+/**
+ * Creates a function that'll short out and invoke `identity` instead
+ * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
+ * milliseconds.
+ *
+ * @private
+ * @param {Function} func The function to restrict.
+ * @returns {Function} Returns the new shortable function.
+ */
+function shortOut(func) {
+  var count = 0,
+      lastCalled = 0;
+
+  return function() {
+    var stamp = nativeNow(),
+        remaining = HOT_SPAN - (stamp - lastCalled);
+
+    lastCalled = stamp;
+    if (remaining > 0) {
+      if (++count >= HOT_COUNT) {
+        return arguments[0];
+      }
+    } else {
+      count = 0;
+    }
+    return func.apply(undefined, arguments);
+  };
+}
+
+module.exports = shortOut;
diff --git a/_shuffleSelf.js b/_shuffleSelf.js
new file mode 100644
index 000000000..718ef7b00
--- /dev/null
+++ b/_shuffleSelf.js
@@ -0,0 +1,25 @@
+var baseRandom = require('./_baseRandom');
+
+/**
+ * A specialized version of `arrayShuffle` which mutates `array`.
+ *
+ * @private
+ * @param {Array} array The array to shuffle.
+ * @returns {Array} Returns `array`.
+ */
+function shuffleSelf(array) {
+  var index = -1,
+      length = array.length,
+      lastIndex = length - 1;
+
+  while (++index < length) {
+    var rand = baseRandom(index, lastIndex),
+        value = array[rand];
+
+    array[rand] = array[index];
+    array[index] = value;
+  }
+  return array;
+}
+
+module.exports = shuffleSelf;
diff --git a/_stackClear.js b/_stackClear.js
index 498482c4c..ce8e5a92f 100644
--- a/_stackClear.js
+++ b/_stackClear.js
@@ -9,6 +9,7 @@ var ListCache = require('./_ListCache');
  */
 function stackClear() {
   this.__data__ = new ListCache;
+  this.size = 0;
 }
 
 module.exports = stackClear;
diff --git a/_stackDelete.js b/_stackDelete.js
index 8c60260c7..ff9887ab6 100644
--- a/_stackDelete.js
+++ b/_stackDelete.js
@@ -8,7 +8,11 @@
  * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  */
 function stackDelete(key) {
-  return this.__data__['delete'](key);
+  var data = this.__data__,
+      result = data['delete'](key);
+
+  this.size = data.size;
+  return result;
 }
 
 module.exports = stackDelete;
diff --git a/_stackSet.js b/_stackSet.js
index 604918376..b790ac5f4 100644
--- a/_stackSet.js
+++ b/_stackSet.js
@@ -16,16 +16,18 @@ var LARGE_ARRAY_SIZE = 200;
  * @returns {Object} Returns the stack cache instance.
  */
 function stackSet(key, value) {
-  var cache = this.__data__;
-  if (cache instanceof ListCache) {
-    var pairs = cache.__data__;
+  var data = this.__data__;
+  if (data instanceof ListCache) {
+    var pairs = data.__data__;
     if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
       pairs.push([key, value]);
+      this.size = ++data.size;
       return this;
     }
-    cache = this.__data__ = new MapCache(pairs);
+    data = this.__data__ = new MapCache(pairs);
   }
-  cache.set(key, value);
+  data.set(key, value);
+  this.size = data.size;
   return this;
 }
 
diff --git a/_strictIndexOf.js b/_strictIndexOf.js
new file mode 100644
index 000000000..0486a4956
--- /dev/null
+++ b/_strictIndexOf.js
@@ -0,0 +1,23 @@
+/**
+ * A specialized version of `_.indexOf` which performs strict equality
+ * comparisons of values, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function strictIndexOf(array, value, fromIndex) {
+  var index = fromIndex - 1,
+      length = array.length;
+
+  while (++index < length) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+module.exports = strictIndexOf;
diff --git a/_strictLastIndexOf.js b/_strictLastIndexOf.js
new file mode 100644
index 000000000..d7310dcc2
--- /dev/null
+++ b/_strictLastIndexOf.js
@@ -0,0 +1,21 @@
+/**
+ * A specialized version of `_.lastIndexOf` which performs strict equality
+ * comparisons of values, i.e. `===`.
+ *
+ * @private
+ * @param {Array} array The array to inspect.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function strictLastIndexOf(array, value, fromIndex) {
+  var index = fromIndex + 1;
+  while (index--) {
+    if (array[index] === value) {
+      return index;
+    }
+  }
+  return index;
+}
+
+module.exports = strictLastIndexOf;
diff --git a/_stringToPath.js b/_stringToPath.js
index 3eaf5c392..8bb78e53f 100644
--- a/_stringToPath.js
+++ b/_stringToPath.js
@@ -1,4 +1,4 @@
-var memoize = require('./memoize'),
+var memoizeCapped = require('./_memoizeCapped'),
     toString = require('./toString');
 
 /** Used to match property names within property paths. */
@@ -15,7 +15,7 @@ var reEscapeChar = /\\(\\)?/g;
  * @param {string} string The string to convert.
  * @returns {Array} Returns the property path array.
  */
-var stringToPath = memoize(function(string) {
+var stringToPath = memoizeCapped(function(string) {
   string = toString(string);
 
   var result = [];
diff --git a/_unescapeHtmlChar.js b/_unescapeHtmlChar.js
index 11e5b7d55..a71fecb3f 100644
--- a/_unescapeHtmlChar.js
+++ b/_unescapeHtmlChar.js
@@ -6,8 +6,7 @@ var htmlUnescapes = {
   '&lt;': '<',
   '&gt;': '>',
   '&quot;': '"',
-  '&#39;': "'",
-  '&#96;': '`'
+  '&#39;': "'"
 };
 
 /**
diff --git a/_unicodeSize.js b/_unicodeSize.js
index 3f50ce86a..26cd25703 100644
--- a/_unicodeSize.js
+++ b/_unicodeSize.js
@@ -34,7 +34,7 @@ var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
 function unicodeSize(string) {
   var result = reUnicode.lastIndex = 0;
   while (reUnicode.test(string)) {
-    result++;
+    ++result;
   }
   return result;
 }
diff --git a/assign.js b/assign.js
index 5488c8b69..909db26a3 100644
--- a/assign.js
+++ b/assign.js
@@ -11,12 +11,6 @@ var objectProto = Object.prototype;
 /** Used to check objects for own properties. */
 var hasOwnProperty = objectProto.hasOwnProperty;
 
-/** 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');
-
 /**
  * Assigns own enumerable string keyed properties of source objects to the
  * destination object. Source objects are applied from left to right.
@@ -50,7 +44,7 @@ var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
  * // => { 'a': 1, 'c': 3 }
  */
 var assign = createAssigner(function(object, source) {
-  if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
+  if (isPrototype(source) || isArrayLike(source)) {
     copyObject(source, keys(source), object);
     return;
   }
diff --git a/at.js b/at.js
index 5849a8caa..05e948254 100644
--- a/at.js
+++ b/at.js
@@ -1,6 +1,5 @@
 var baseAt = require('./_baseAt'),
-    baseFlatten = require('./_baseFlatten'),
-    baseRest = require('./_baseRest');
+    flatRest = require('./_flatRest');
 
 /**
  * Creates an array of values corresponding to `paths` of `object`.
@@ -19,8 +18,6 @@ var baseAt = require('./_baseAt'),
  * _.at(object, ['a[0].b.c', 'a[1]']);
  * // => [3, 4]
  */
-var at = baseRest(function(object, paths) {
-  return baseAt(object, baseFlatten(paths, 1));
-});
+var at = flatRest(baseAt);
 
 module.exports = at;
diff --git a/bindAll.js b/bindAll.js
index 7d0d09d5a..a35706dee 100644
--- a/bindAll.js
+++ b/bindAll.js
@@ -1,7 +1,7 @@
 var arrayEach = require('./_arrayEach'),
-    baseFlatten = require('./_baseFlatten'),
-    baseRest = require('./_baseRest'),
+    baseAssignValue = require('./_baseAssignValue'),
     bind = require('./bind'),
+    flatRest = require('./_flatRest'),
     toKey = require('./_toKey');
 
 /**
@@ -30,10 +30,10 @@ var arrayEach = require('./_arrayEach'),
  * jQuery(element).on('click', view.click);
  * // => Logs 'clicked docs' when clicked.
  */
-var bindAll = baseRest(function(object, methodNames) {
-  arrayEach(baseFlatten(methodNames, 1), function(key) {
+var bindAll = flatRest(function(object, methodNames) {
+  arrayEach(methodNames, function(key) {
     key = toKey(key);
-    object[key] = bind(object[key], object);
+    baseAssignValue(object, key, bind(object[key], object));
   });
   return object;
 });
diff --git a/concat.js b/concat.js
index 506306c65..1da48a4fc 100644
--- a/concat.js
+++ b/concat.js
@@ -26,17 +26,18 @@ var arrayPush = require('./_arrayPush'),
  * // => [1]
  */
 function concat() {
-  var length = arguments.length,
-      args = Array(length ? length - 1 : 0),
+  var length = arguments.length;
+  if (!length) {
+    return [];
+  }
+  var args = Array(length - 1),
       array = arguments[0],
       index = length;
 
   while (index--) {
     args[index - 1] = arguments[index];
   }
-  return length
-    ? arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1))
-    : [];
+  return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
 }
 
 module.exports = concat;
diff --git a/core.js b/core.js
index de27977d2..7b2496722 100644
--- a/core.js
+++ b/core.js
@@ -13,7 +13,7 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.15.0';
+  var VERSION = '4.16.0';
 
   /** Used as the `TypeError` message for "Functions" methods. */
   var FUNC_ERROR_TEXT = 'Expected a function';
@@ -53,8 +53,7 @@
     '<': '&lt;',
     '>': '&gt;',
     '"': '&quot;',
-    "'": '&#39;',
-    '`': '&#96;'
+    "'": '&#39;'
   };
 
   /** Detect free variable `global` from Node.js. */
@@ -183,17 +182,6 @@
    */
   var escapeHtmlChar = basePropertyOf(htmlEscapes);
 
-  /**
-   * Checks if `value` is a host object in IE < 9.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
-   */
-  function isHostObject() {
-    return false;
-  }
-
   /**
    * Creates a unary function that invokes `func` with its argument transformed.
    *
@@ -414,10 +402,23 @@
     var objValue = object[key];
     if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
         (value === undefined && !(key in object))) {
-      object[key] = value;
+      baseAssignValue(object, key, value);
     }
   }
 
+  /**
+   * The base implementation of `assignValue` and `assignMergeValue` without
+   * value checks.
+   *
+   * @private
+   * @param {Object} object The object to modify.
+   * @param {string} key The key of the property to assign.
+   * @param {*} value The value to assign.
+   */
+  function baseAssignValue(object, key, value) {
+    object[key] = value;
+  }
+
   /**
    * The base implementation of `_.create` without support for assigning
    * properties to the created object.
@@ -674,8 +675,8 @@
       othTag = objectToString.call(other);
       othTag = othTag == argsTag ? objectTag : othTag;
     }
-    var objIsObj = objTag == objectTag && !isHostObject(object),
-        othIsObj = othTag == objectTag && !isHostObject(other),
+    var objIsObj = objTag == objectTag,
+        othIsObj = othTag == objectTag,
         isSameTag = objTag == othTag;
 
     stack || (stack = []);
@@ -832,24 +833,7 @@
    * @returns {Function} Returns the new function.
    */
   function baseRest(func, start) {
-    start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
-    return function() {
-      var args = arguments,
-          index = -1,
-          length = nativeMax(args.length - start, 0),
-          array = Array(length);
-
-      while (++index < length) {
-        array[index] = args[start + index];
-      }
-      index = -1;
-      var otherArgs = Array(start + 1);
-      while (++index < start) {
-        otherArgs[index] = args[index];
-      }
-      otherArgs[start] = array;
-      return func.apply(this, otherArgs);
-    };
+    return setToString(overRest(func, start, identity), func + '');
   }
 
   /**
@@ -979,6 +963,7 @@
    * @returns {Object} Returns `object`.
    */
   function copyObject(source, props, object, customizer) {
+    var isNew = !object;
     object || (object = {});
 
     var index = -1,
@@ -991,7 +976,14 @@
         ? customizer(object[key], source[key], key, object, source)
         : undefined;
 
-      assignValue(object, key, newValue === undefined ? source[key] : newValue);
+      if (newValue === undefined) {
+        newValue = source[key];
+      }
+      if (isNew) {
+        baseAssignValue(object, key, newValue);
+      } else {
+        assignValue(object, key, newValue);
+      }
     }
     return object;
   }
@@ -1326,6 +1318,17 @@
     return result;
   }
 
+  /**
+   * A specialized version of `baseRest` which flattens the rest array.
+   *
+   * @private
+   * @param {Function} func The function to apply a rest parameter to.
+   * @returns {Function} Returns the new function.
+   */
+  function flatRest(func) {
+    return setToString(overRest(func, undefined, flatten), func + '');
+  }
+
   /**
    * Checks if `value` is a flattenable `arguments` object or array.
    *
@@ -1356,6 +1359,46 @@
     return result;
   }
 
+  /**
+   * A specialized version of `baseRest` which transforms the rest array.
+   *
+   * @private
+   * @param {Function} func The function to apply a rest parameter to.
+   * @param {number} [start=func.length-1] The start position of the rest parameter.
+   * @param {Function} transform The rest array transform.
+   * @returns {Function} Returns the new function.
+   */
+  function overRest(func, start, transform) {
+    start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+    return function() {
+      var args = arguments,
+          index = -1,
+          length = nativeMax(args.length - start, 0),
+          array = Array(length);
+
+      while (++index < length) {
+        array[index] = args[start + index];
+      }
+      index = -1;
+      var otherArgs = Array(start + 1);
+      while (++index < start) {
+        otherArgs[index] = args[index];
+      }
+      otherArgs[start] = transform(array);
+      return func.apply(this, otherArgs);
+    };
+  }
+
+  /**
+   * Sets the `toString` method of `func` to return `string`.
+   *
+   * @private
+   * @param {Function} func The function to modify.
+   * @param {Function} string The `toString` result.
+   * @returns {Function} Returns `func`.
+   */
+  var setToString = identity;
+
   /**
    * Converts `value` to a string key if it's not a string or symbol.
    *
@@ -1409,17 +1452,18 @@
    * // => [1]
    */
   function concat() {
-    var length = arguments.length,
-        args = Array(length ? length - 1 : 0),
+    var length = arguments.length;
+    if (!length) {
+      return [];
+    }
+    var args = Array(length - 1),
         array = arguments[0],
         index = length;
 
     while (index--) {
       args[index - 1] = arguments[index];
     }
-    return length
-      ? arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1))
-      : [];
+    return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
   }
 
   /**
@@ -1905,7 +1949,7 @@
    * @see _.forEachRight
    * @example
    *
-   * _([1, 2]).forEach(function(value) {
+   * _.forEach([1, 2], function(value) {
    *   console.log(value);
    * });
    * // => Logs `1` then `2`.
@@ -2099,16 +2143,11 @@
    *   { 'user': 'barney', 'age': 34 }
    * ];
    *
-   * _.sortBy(users, function(o) { return o.user; });
+   * _.sortBy(users, [function(o) { return o.user; }]);
    * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
    *
    * _.sortBy(users, ['user', 'age']);
    * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
-   *
-   * _.sortBy(users, 'user', function(o) {
-   *   return Math.floor(o.age / 10);
-   * });
-   * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
    */
   function sortBy(collection, iteratee) {
     var index = 0;
@@ -2212,7 +2251,7 @@
    * _.defer(function(text) {
    *   console.log(text);
    * }, 'deferred');
-   * // => Logs 'deferred' after one or more milliseconds.
+   * // => Logs 'deferred' after one millisecond.
    */
   var defer = baseRest(function(func, args) {
     return baseDelay(func, 1, args);
@@ -2698,7 +2737,7 @@
    */
   function isObject(value) {
     var type = typeof value;
-    return !!value && (type == 'object' || type == 'function');
+    return value != null && (type == 'object' || type == 'function');
   }
 
   /**
@@ -2726,7 +2765,7 @@
    * // => false
    */
   function isObjectLike(value) {
-    return !!value && typeof value == 'object';
+    return value != null && typeof value == 'object';
   }
 
   /**
@@ -3263,8 +3302,8 @@
    * _.pick(object, ['a', 'c']);
    * // => { 'a': 1, 'c': 3 }
    */
-  var pick = baseRest(function(object, props) {
-    return object == null ? {} : basePick(object, baseMap(baseFlatten(props, 1), toKey));
+  var pick = flatRest(function(object, props) {
+    return object == null ? {} : basePick(object, baseMap(props, toKey));
   });
 
   /**
@@ -3337,8 +3376,8 @@
   /*------------------------------------------------------------------------*/
 
   /**
-   * Converts the characters "&", "<", ">", '"', "'", and "\`" in `string` to
-   * their corresponding HTML entities.
+   * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
+   * corresponding HTML entities.
    *
    * **Note:** No other characters are escaped. To escape additional
    * characters use a third-party library like [_he_](https://mths.be/he).
@@ -3349,12 +3388,6 @@
    * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
    * (under "semi-related fun fact") for more details.
    *
-   * Backticks are escaped because in IE < 9, they can break out of
-   * attribute values or HTML comments. See [#59](https://html5sec.org/#59),
-   * [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
-   * [#133](https://html5sec.org/#133) of the
-   * [HTML5 Security Cheatsheet](https://html5sec.org/) for more details.
-   *
    * When working with HTML you should always
    * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
    * XSS vectors.
diff --git a/core.min.js b/core.min.js
index f5c9efaee..2182f73d3 100644
--- a/core.min.js
+++ b/core.min.js
@@ -3,26 +3,26 @@
  * lodash (Custom Build) /license | Underscore.js 1.8.3 underscorejs.org/LICENSE
  * Build: `lodash core -o ./dist/lodash.core.js`
  */
-;(function(){function n(n,t){return n.push.apply(n,t),n}function t(n){return function(t){return null==t?Z:t[n]}}function r(n,t,r,e,u){return u(n,function(n,u,o){r=e?(e=false,n):t(r,n,u,o)}),r}function e(n,t){return d(t,function(t){return n[t]})}function u(n){return n instanceof o?n:new o(n)}function o(n,t){this.__wrapped__=n,this.__actions__=[],this.__chain__=!!t}function i(n,t,r,e){return n===Z||J(n,an[r])&&!ln.call(e,r)?t:n}function c(n){return V(n)?vn(n):{}}function f(n,t,r){if(typeof n!="function")throw new TypeError("Expected a function");
-return setTimeout(function(){n.apply(Z,r)},t)}function a(n,t){var r=true;return jn(n,function(n,e,u){return r=!!t(n,e,u)}),r}function l(n,t,r){for(var e=-1,u=n.length;++e<u;){var o=n[e],i=t(o);if(null!=i&&(c===Z?i===i:r(i,c)))var c=i,f=o}return f}function p(n,t){var r=[];return jn(n,function(n,e,u){t(n,e,u)&&r.push(n)}),r}function s(t,r,e,u,o){var i=-1,c=t.length;for(e||(e=D),o||(o=[]);++i<c;){var f=t[i];0<r&&e(f)?1<r?s(f,r-1,e,u,o):n(o,f):u||(o[o.length]=f)}return o}function h(n,t){return n&&dn(n,t,Rn);
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diff --git a/countBy.js b/countBy.js
index 9861dddaa..15aafbdd5 100644
--- a/countBy.js
+++ b/countBy.js
@@ -1,4 +1,5 @@
-var createAggregator = require('./_createAggregator');
+var baseAssignValue = require('./_baseAssignValue'),
+    createAggregator = require('./_createAggregator');
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
@@ -30,7 +31,11 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * // => { '3': 2, '5': 1 }
  */
 var countBy = createAggregator(function(result, value, key) {
-  hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1);
+  if (hasOwnProperty.call(result, key)) {
+    ++result[key];
+  } else {
+    baseAssignValue(result, key, 1);
+  }
 });
 
 module.exports = countBy;
diff --git a/defer.js b/defer.js
index 351f630bc..f6d6c6fa6 100644
--- a/defer.js
+++ b/defer.js
@@ -17,7 +17,7 @@ var baseDelay = require('./_baseDelay'),
  * _.defer(function(text) {
  *   console.log(text);
  * }, 'deferred');
- * // => Logs 'deferred' after one or more milliseconds.
+ * // => Logs 'deferred' after one millisecond.
  */
 var defer = baseRest(function(func, args) {
   return baseDelay(func, 1, args);
diff --git a/difference.js b/difference.js
index c18e05785..fa28bb301 100644
--- a/difference.js
+++ b/difference.js
@@ -6,8 +6,8 @@ var baseDifference = require('./_baseDifference'),
 /**
  * Creates an array of `array` values not included in the other given arrays
  * 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.
+ * for equality comparisons. The order and references of result values are
+ * determined by the first array.
  *
  * **Note:** Unlike `_.pullAll`, this method returns a new array.
  *
diff --git a/differenceBy.js b/differenceBy.js
index 16fa097a7..2cd63e7ec 100644
--- a/differenceBy.js
+++ b/differenceBy.js
@@ -8,8 +8,9 @@ var baseDifference = require('./_baseDifference'),
 /**
  * This method is like `_.difference` except that it accepts `iteratee` which
  * is invoked for each element of `array` and `values` to generate the criterion
- * by which they're compared. Result values are chosen from the first array.
- * The iteratee is invoked with one argument: (value).
+ * by which they're compared. The order and references of result values are
+ * determined by the first array. The iteratee is invoked with one argument:
+ * (value).
  *
  * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
  *
diff --git a/differenceWith.js b/differenceWith.js
index 82ecc95fc..c0233f4b9 100644
--- a/differenceWith.js
+++ b/differenceWith.js
@@ -6,9 +6,9 @@ var baseDifference = require('./_baseDifference'),
 
 /**
  * This method is like `_.difference` except that it accepts `comparator`
- * which is invoked to compare elements of `array` to `values`. Result values
- * are chosen from the first array. The comparator is invoked with two arguments:
- * (arrVal, othVal).
+ * which is invoked to compare elements of `array` to `values`. The order and
+ * references of result values are determined by the first array. The comparator
+ * is invoked with two arguments: (arrVal, othVal).
  *
  * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
  *
diff --git a/escape.js b/escape.js
index 176417c4c..a0e77e25e 100644
--- a/escape.js
+++ b/escape.js
@@ -6,8 +6,8 @@ var reUnescapedHtml = /[&<>"'`]/g,
     reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
 
 /**
- * Converts the characters "&", "<", ">", '"', "'", and "\`" in `string` to
- * their corresponding HTML entities.
+ * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
+ * corresponding HTML entities.
  *
  * **Note:** No other characters are escaped. To escape additional
  * characters use a third-party library like [_he_](https://mths.be/he).
@@ -18,12 +18,6 @@ var reUnescapedHtml = /[&<>"'`]/g,
  * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
  * (under "semi-related fun fact") for more details.
  *
- * Backticks are escaped because in IE < 9, they can break out of
- * attribute values or HTML comments. See [#59](https://html5sec.org/#59),
- * [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
- * [#133](https://html5sec.org/#133) of the
- * [HTML5 Security Cheatsheet](https://html5sec.org/) for more details.
- *
  * When working with HTML you should always
  * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
  * XSS vectors.
diff --git a/forEach.js b/forEach.js
index 143515ffe..0ce879f93 100644
--- a/forEach.js
+++ b/forEach.js
@@ -23,7 +23,7 @@ var arrayEach = require('./_arrayEach'),
  * @see _.forEachRight
  * @example
  *
- * _([1, 2]).forEach(function(value) {
+ * _.forEach([1, 2], function(value) {
  *   console.log(value);
  * });
  * // => Logs `1` then `2`.
diff --git a/fp/_mapping.js b/fp/_mapping.js
index dd4abcb55..7fa8e672e 100644
--- a/fp/_mapping.js
+++ b/fp/_mapping.js
@@ -108,9 +108,10 @@ exports.aryMethod = {
     'includesFrom', 'indexOfFrom', 'inRange', 'intersectionBy', 'intersectionWith',
     'invokeArgs', 'invokeArgsMap', 'isEqualWith', 'isMatchWith', 'flatMapDepth',
     'lastIndexOfFrom', 'mergeWith', 'orderBy', 'padChars', 'padCharsEnd',
-    'padCharsStart', 'pullAllBy', 'pullAllWith', 'reduce', 'reduceRight', 'replace',
-    'set', 'slice', 'sortedIndexBy', 'sortedLastIndexBy', 'transform', 'unionBy',
-    'unionWith', 'update', 'xorBy', 'xorWith', 'zipWith'
+    'padCharsStart', 'pullAllBy', 'pullAllWith', 'rangeStep', 'rangeStepRight',
+    'reduce', 'reduceRight', 'replace', 'set', 'slice', 'sortedIndexBy',
+    'sortedLastIndexBy', 'transform', 'unionBy', 'unionWith', 'update', 'xorBy',
+    'xorWith', 'zipWith'
   ],
   '4': [
     'fill', 'setWith', 'updateWith'
@@ -189,6 +190,8 @@ exports.methodRearg = {
   'padCharsStart': [2, 1, 0],
   'pullAllBy': [2, 1, 0],
   'pullAllWith': [2, 1, 0],
+  'rangeStep': [1, 2, 0],
+  'rangeStepRight': [1, 2, 0],
   'setWith': [3, 1, 2, 0],
   'sortedIndexBy': [2, 1, 0],
   'sortedLastIndexBy': [2, 1, 0],
@@ -310,6 +313,8 @@ exports.remap = {
   'padCharsEnd': 'padEnd',
   'padCharsStart': 'padStart',
   'propertyOf': 'get',
+  'rangeStep': 'range',
+  'rangeStepRight': 'rangeRight',
   'restFrom': 'rest',
   'spreadFrom': 'spread',
   'trimChars': 'trim',
diff --git a/fp/rangeStep.js b/fp/rangeStep.js
new file mode 100644
index 000000000..d72dfc200
--- /dev/null
+++ b/fp/rangeStep.js
@@ -0,0 +1,5 @@
+var convert = require('./convert'),
+    func = convert('rangeStep', require('../range'));
+
+func.placeholder = require('./placeholder');
+module.exports = func;
diff --git a/fp/rangeStepRight.js b/fp/rangeStepRight.js
new file mode 100644
index 000000000..8b2a67bc6
--- /dev/null
+++ b/fp/rangeStepRight.js
@@ -0,0 +1,5 @@
+var convert = require('./convert'),
+    func = convert('rangeStepRight', require('../rangeRight'));
+
+func.placeholder = require('./placeholder');
+module.exports = func;
diff --git a/groupBy.js b/groupBy.js
index 3a7dbaf43..5b73b4104 100644
--- a/groupBy.js
+++ b/groupBy.js
@@ -1,4 +1,5 @@
-var createAggregator = require('./_createAggregator');
+var baseAssignValue = require('./_baseAssignValue'),
+    createAggregator = require('./_createAggregator');
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
@@ -34,7 +35,7 @@ var groupBy = createAggregator(function(result, value, key) {
   if (hasOwnProperty.call(result, key)) {
     result[key].push(value);
   } else {
-    result[key] = [value];
+    baseAssignValue(result, key, [value]);
   }
 });
 
diff --git a/intersection.js b/intersection.js
index b56d4dd32..a94c13512 100644
--- a/intersection.js
+++ b/intersection.js
@@ -6,8 +6,8 @@ var arrayMap = require('./_arrayMap'),
 /**
  * Creates an array of unique values that are included in all given arrays
  * 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.
+ * for equality comparisons. The order and references of result values are
+ * determined by the first array.
  *
  * @static
  * @memberOf _
diff --git a/intersectionBy.js b/intersectionBy.js
index 436c28646..31461aae5 100644
--- a/intersectionBy.js
+++ b/intersectionBy.js
@@ -8,8 +8,9 @@ var arrayMap = require('./_arrayMap'),
 /**
  * This method is like `_.intersection` except that it accepts `iteratee`
  * which is invoked for each element of each `arrays` to generate the criterion
- * by which they're compared. Result values are chosen from the first array.
- * The iteratee is invoked with one argument: (value).
+ * by which they're compared. The order and references of result values are
+ * determined by the first array. The iteratee is invoked with one argument:
+ * (value).
  *
  * @static
  * @memberOf _
diff --git a/intersectionWith.js b/intersectionWith.js
index 736eca26a..0ba2f9a61 100644
--- a/intersectionWith.js
+++ b/intersectionWith.js
@@ -6,9 +6,9 @@ var arrayMap = require('./_arrayMap'),
 
 /**
  * This method is like `_.intersection` except that it accepts `comparator`
- * which is invoked to compare elements of `arrays`. Result values are chosen
- * from the first array. The comparator is invoked with two arguments:
- * (arrVal, othVal).
+ * which is invoked to compare elements of `arrays`. The order and references
+ * of result values are determined by the first array. The comparator is
+ * invoked with two arguments: (arrVal, othVal).
  *
  * @static
  * @memberOf _
diff --git a/isElement.js b/isElement.js
index 62cdb062e..0c151a475 100644
--- a/isElement.js
+++ b/isElement.js
@@ -19,7 +19,7 @@ var isObjectLike = require('./isObjectLike'),
  * // => false
  */
 function isElement(value) {
-  return !!value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
+  return value != null && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
 }
 
 module.exports = isElement;
diff --git a/isEmpty.js b/isEmpty.js
index 726ac9871..4bee45502 100644
--- a/isEmpty.js
+++ b/isEmpty.js
@@ -16,12 +16,6 @@ var objectProto = Object.prototype;
 /** Used to check objects for own properties. */
 var hasOwnProperty = objectProto.hasOwnProperty;
 
-/** 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');
-
 /**
  * Checks if `value` is an empty object, collection, map, or set.
  *
@@ -65,7 +59,7 @@ function isEmpty(value) {
   if (tag == mapTag || tag == setTag) {
     return !value.size;
   }
-  if (nonEnumShadows || isPrototype(value)) {
+  if (isPrototype(value)) {
     return !nativeKeys(value).length;
   }
   for (var key in value) {
diff --git a/isObject.js b/isObject.js
index 4f96dd0a2..1dc893918 100644
--- a/isObject.js
+++ b/isObject.js
@@ -25,7 +25,7 @@
  */
 function isObject(value) {
   var type = typeof value;
-  return !!value && (type == 'object' || type == 'function');
+  return value != null && (type == 'object' || type == 'function');
 }
 
 module.exports = isObject;
diff --git a/isObjectLike.js b/isObjectLike.js
index e34114be5..301716b5a 100644
--- a/isObjectLike.js
+++ b/isObjectLike.js
@@ -23,7 +23,7 @@
  * // => false
  */
 function isObjectLike(value) {
-  return !!value && typeof value == 'object';
+  return value != null && typeof value == 'object';
 }
 
 module.exports = isObjectLike;
diff --git a/isPlainObject.js b/isPlainObject.js
index 3ac962c7f..035fbb2a1 100644
--- a/isPlainObject.js
+++ b/isPlainObject.js
@@ -1,5 +1,4 @@
 var getPrototype = require('./_getPrototype'),
-    isHostObject = require('./_isHostObject'),
     isObjectLike = require('./isObjectLike');
 
 /** `Object#toString` result references. */
@@ -54,8 +53,7 @@ var objectToString = objectProto.toString;
  * // => true
  */
 function isPlainObject(value) {
-  if (!isObjectLike(value) ||
-      objectToString.call(value) != objectTag || isHostObject(value)) {
+  if (!isObjectLike(value) || objectToString.call(value) != objectTag) {
     return false;
   }
   var proto = getPrototype(value);
diff --git a/keyBy.js b/keyBy.js
index 44393bf57..d0047a5f2 100644
--- a/keyBy.js
+++ b/keyBy.js
@@ -1,4 +1,5 @@
-var createAggregator = require('./_createAggregator');
+var baseAssignValue = require('./_baseAssignValue'),
+    createAggregator = require('./_createAggregator');
 
 /**
  * Creates an object composed of keys generated from the results of running
@@ -30,7 +31,7 @@ var createAggregator = require('./_createAggregator');
  * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
  */
 var keyBy = createAggregator(function(result, value, key) {
-  result[key] = value;
+  baseAssignValue(result, key, value);
 });
 
 module.exports = keyBy;
diff --git a/lastIndexOf.js b/lastIndexOf.js
index c2e2c4112..9201cb9a2 100644
--- a/lastIndexOf.js
+++ b/lastIndexOf.js
@@ -1,5 +1,6 @@
 var baseFindIndex = require('./_baseFindIndex'),
     baseIsNaN = require('./_baseIsNaN'),
+    strictLastIndexOf = require('./_strictLastIndexOf'),
     toInteger = require('./toInteger');
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
@@ -35,21 +36,11 @@ function lastIndexOf(array, value, fromIndex) {
   var index = length;
   if (fromIndex !== undefined) {
     index = toInteger(fromIndex);
-    index = (
-      index < 0
-        ? nativeMax(length + index, 0)
-        : nativeMin(index, length - 1)
-    ) + 1;
+    index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
   }
-  if (value !== value) {
-    return baseFindIndex(array, baseIsNaN, index - 1, true);
-  }
-  while (index--) {
-    if (array[index] === value) {
-      return index;
-    }
-  }
-  return -1;
+  return value === value
+    ? strictLastIndexOf(array, value, index)
+    : baseFindIndex(array, baseIsNaN, index, true);
 }
 
 module.exports = lastIndexOf;
diff --git a/lodash.js b/lodash.js
index 6b2525630..100e38839 100644
--- a/lodash.js
+++ b/lodash.js
@@ -12,7 +12,7 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.15.0';
+  var VERSION = '4.16.0';
 
   /** Used as the size to enable large array optimizations. */
   var LARGE_ARRAY_SIZE = 200;
@@ -23,6 +23,9 @@
   /** Used to stand-in for `undefined` hash values. */
   var HASH_UNDEFINED = '__lodash_hash_undefined__';
 
+  /** Used as the maximum memoize cache size. */
+  var MAX_MEMOIZE_SIZE = 500;
+
   /** Used as the internal argument placeholder. */
   var PLACEHOLDER = '__lodash_placeholder__';
 
@@ -47,7 +50,7 @@
       DEFAULT_TRUNC_OMISSION = '...';
 
   /** Used to detect hot functions by number of calls within a span of milliseconds. */
-  var HOT_COUNT = 150,
+  var HOT_COUNT = 500,
       HOT_SPAN = 16;
 
   /** Used to indicate the type of lazy iteratees. */
@@ -164,9 +167,6 @@
   /** Used to match `RegExp` flags from their coerced string values. */
   var reFlags = /\w*$/;
 
-  /** Used to detect hexadecimal string values. */
-  var reHasHexPrefix = /^0x/i;
-
   /** Used to detect bad signed hexadecimal string values. */
   var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
 
@@ -361,7 +361,7 @@
     '\u017a': 'z',  '\u017c': 'z', '\u017e': 'z',
     '\u0132': 'IJ', '\u0133': 'ij',
     '\u0152': 'Oe', '\u0153': 'oe',
-    '\u0149': "'n", '\u017f': 'ss'
+    '\u0149': "'n", '\u017f': 's'
   };
 
   /** Used to map characters to HTML entities. */
@@ -370,8 +370,7 @@
     '<': '&lt;',
     '>': '&gt;',
     '"': '&quot;',
-    "'": '&#39;',
-    '`': '&#96;'
+    "'": '&#39;'
   };
 
   /** Used to map HTML entities to characters. */
@@ -380,8 +379,7 @@
     '&lt;': '<',
     '&gt;': '>',
     '&quot;': '"',
-    '&#39;': "'",
-    '&#96;': '`'
+    '&#39;': "'"
   };
 
   /** Used to escape characters for inclusion in compiled string literals. */
@@ -822,18 +820,9 @@
    * @returns {number} Returns the index of the matched value, else `-1`.
    */
   function baseIndexOf(array, value, fromIndex) {
-    if (value !== value) {
-      return baseFindIndex(array, baseIsNaN, fromIndex);
-    }
-    var index = fromIndex - 1,
-        length = array.length;
-
-    while (++index < length) {
-      if (array[index] === value) {
-        return index;
-      }
-    }
-    return -1;
+    return value === value
+      ? strictIndexOf(array, value, fromIndex)
+      : baseFindIndex(array, baseIsNaN, fromIndex);
   }
 
   /**
@@ -1038,7 +1027,7 @@
   }
 
   /**
-   * Checks if a cache value for `key` exists.
+   * Checks if a `cache` value for `key` exists.
    *
    * @private
    * @param {Object} cache The cache to query.
@@ -1096,7 +1085,7 @@
 
     while (length--) {
       if (array[length] === placeholder) {
-        result++;
+        ++result;
       }
     }
     return result;
@@ -1166,25 +1155,6 @@
     return reHasUnicodeWord.test(string);
   }
 
-  /**
-   * Checks if `value` is a host object in IE < 9.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
-   */
-  function isHostObject(value) {
-    // Many host objects are `Object` objects that can coerce to strings
-    // despite having improperly defined `toString` methods.
-    var result = false;
-    if (value != null && typeof value.toString != 'function') {
-      try {
-        result = !!(value + '');
-      } catch (e) {}
-    }
-    return result;
-  }
-
   /**
    * Converts `iterator` to an array.
    *
@@ -1292,6 +1262,48 @@
     return result;
   }
 
+  /**
+   * A specialized version of `_.indexOf` which performs strict equality
+   * comparisons of values, i.e. `===`.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} value The value to search for.
+   * @param {number} fromIndex The index to search from.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function strictIndexOf(array, value, fromIndex) {
+    var index = fromIndex - 1,
+        length = array.length;
+
+    while (++index < length) {
+      if (array[index] === value) {
+        return index;
+      }
+    }
+    return -1;
+  }
+
+  /**
+   * A specialized version of `_.lastIndexOf` which performs strict equality
+   * comparisons of values, i.e. `===`.
+   *
+   * @private
+   * @param {Array} array The array to inspect.
+   * @param {*} value The value to search for.
+   * @param {number} fromIndex The index to search from.
+   * @returns {number} Returns the index of the matched value, else `-1`.
+   */
+  function strictLastIndexOf(array, value, fromIndex) {
+    var index = fromIndex + 1;
+    while (index--) {
+      if (array[index] === value) {
+        return index;
+      }
+    }
+    return index;
+  }
+
   /**
    * Gets the number of symbols in `string`.
    *
@@ -1337,7 +1349,7 @@
   function unicodeSize(string) {
     var result = reUnicode.lastIndex = 0;
     while (reUnicode.test(string)) {
-      result++;
+      ++result;
     }
     return result;
   }
@@ -1392,13 +1404,6 @@
    * lodash.isFunction(lodash.bar);
    * // => true
    *
-   * // Use `context` to stub `Date#getTime` use in `_.now`.
-   * var stubbed = _.runInContext({
-   *   'Date': function() {
-   *     return { 'getTime': stubGetTime };
-   *   }
-   * });
-   *
    * // Create a suped-up `defer` in Node.js.
    * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
    */
@@ -1462,6 +1467,7 @@
     var Buffer = moduleExports ? context.Buffer : undefined,
         Symbol = context.Symbol,
         Uint8Array = context.Uint8Array,
+        defineProperty = Object.defineProperty,
         getPrototype = overArg(Object.getPrototypeOf, Object),
         iteratorSymbol = Symbol ? Symbol.iterator : undefined,
         objectCreate = Object.create,
@@ -1484,6 +1490,7 @@
         nativeKeys = overArg(Object.keys, Object),
         nativeMax = Math.max,
         nativeMin = Math.min,
+        nativeNow = Date.now,
         nativeParseInt = context.parseInt,
         nativeRandom = Math.random,
         nativeReverse = arrayProto.reverse;
@@ -1494,22 +1501,12 @@
         Promise = getNative(context, 'Promise'),
         Set = getNative(context, 'Set'),
         WeakMap = getNative(context, 'WeakMap'),
-        nativeCreate = getNative(Object, 'create');
-
-    /* Used to set `toString` methods. */
-    var defineProperty = (function() {
-      var func = getNative(Object, 'defineProperty'),
-          name = getNative.name;
-
-      return (name && name.length > 2) ? func : undefined;
-    }());
+        nativeCreate = getNative(Object, 'create'),
+        nativeDefineProperty = getNative(Object, 'defineProperty');
 
     /** Used to store function metadata. */
     var metaMap = WeakMap && new WeakMap;
 
-    /** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
-    var nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');
-
     /** Used to lookup unminified function names. */
     var realNames = {};
 
@@ -1897,6 +1894,7 @@
      */
     function hashClear() {
       this.__data__ = nativeCreate ? nativeCreate(null) : {};
+      this.size = 0;
     }
 
     /**
@@ -1910,7 +1908,9 @@
      * @returns {boolean} Returns `true` if the entry was removed, else `false`.
      */
     function hashDelete(key) {
-      return this.has(key) && delete this.__data__[key];
+      var result = this.has(key) && delete this.__data__[key];
+      this.size -= result ? 1 : 0;
+      return result;
     }
 
     /**
@@ -1957,6 +1957,7 @@
      */
     function hashSet(key, value) {
       var data = this.__data__;
+      this.size += this.has(key) ? 0 : 1;
       data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
       return this;
     }
@@ -1997,6 +1998,7 @@
      */
     function listCacheClear() {
       this.__data__ = [];
+      this.size = 0;
     }
 
     /**
@@ -2021,6 +2023,7 @@
       } else {
         splice.call(data, index, 1);
       }
+      --this.size;
       return true;
     }
 
@@ -2068,6 +2071,7 @@
           index = assocIndexOf(data, key);
 
       if (index < 0) {
+        ++this.size;
         data.push([key, value]);
       } else {
         data[index][1] = value;
@@ -2110,6 +2114,7 @@
      * @memberOf MapCache
      */
     function mapCacheClear() {
+      this.size = 0;
       this.__data__ = {
         'hash': new Hash,
         'map': new (Map || ListCache),
@@ -2127,7 +2132,9 @@
      * @returns {boolean} Returns `true` if the entry was removed, else `false`.
      */
     function mapCacheDelete(key) {
-      return getMapData(this, key)['delete'](key);
+      var result = getMapData(this, key)['delete'](key);
+      this.size -= result ? 1 : 0;
+      return result;
     }
 
     /**
@@ -2167,7 +2174,11 @@
      * @returns {Object} Returns the map cache instance.
      */
     function mapCacheSet(key, value) {
-      getMapData(this, key).set(key, value);
+      var data = getMapData(this, key),
+          size = data.size;
+
+      data.set(key, value);
+      this.size += data.size == size ? 0 : 1;
       return this;
     }
 
@@ -2240,7 +2251,8 @@
      * @param {Array} [entries] The key-value pairs to cache.
      */
     function Stack(entries) {
-      this.__data__ = new ListCache(entries);
+      var data = this.__data__ = new ListCache(entries);
+      this.size = data.size;
     }
 
     /**
@@ -2252,6 +2264,7 @@
      */
     function stackClear() {
       this.__data__ = new ListCache;
+      this.size = 0;
     }
 
     /**
@@ -2264,7 +2277,11 @@
      * @returns {boolean} Returns `true` if the entry was removed, else `false`.
      */
     function stackDelete(key) {
-      return this.__data__['delete'](key);
+      var data = this.__data__,
+          result = data['delete'](key);
+
+      this.size = data.size;
+      return result;
     }
 
     /**
@@ -2304,16 +2321,18 @@
      * @returns {Object} Returns the stack cache instance.
      */
     function stackSet(key, value) {
-      var cache = this.__data__;
-      if (cache instanceof ListCache) {
-        var pairs = cache.__data__;
+      var data = this.__data__;
+      if (data instanceof ListCache) {
+        var pairs = data.__data__;
         if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
           pairs.push([key, value]);
+          this.size = ++data.size;
           return this;
         }
-        cache = this.__data__ = new MapCache(pairs);
+        data = this.__data__ = new MapCache(pairs);
       }
-      cache.set(key, value);
+      data.set(key, value);
+      this.size = data.size;
       return this;
     }
 
@@ -2353,6 +2372,44 @@
       return result;
     }
 
+    /**
+     * A specialized version of `_.sample` for arrays without support for iteratee
+     * shorthands.
+     *
+     * @private
+     * @param {Array} array The array to sample.
+     * @returns {*} Returns the random element.
+     */
+    function arraySample(array) {
+      var length = array.length;
+      return length ? array[baseRandom(0, length - 1)] : undefined;
+    }
+
+    /**
+     * A specialized version of `_.sampleSize` for arrays.
+     *
+     * @private
+     * @param {Array} array The array to sample.
+     * @param {number} n The number of elements to sample.
+     * @returns {Array} Returns the random elements.
+     */
+    function arraySampleSize(array, n) {
+      var result = arrayShuffle(array);
+      result.length = baseClamp(n, 0, result.length);
+      return result;
+    }
+
+    /**
+     * A specialized version of `_.shuffle` for arrays.
+     *
+     * @private
+     * @param {Array} array The array to shuffle.
+     * @returns {Array} Returns the new shuffled array.
+     */
+    function arrayShuffle(array) {
+      return shuffleSelf(copyArray(array));
+    }
+
     /**
      * Used by `_.defaults` to customize its `_.assignIn` use.
      *
@@ -2383,7 +2440,7 @@
     function assignMergeValue(object, key, value) {
       if ((value !== undefined && !eq(object[key], value)) ||
           (typeof key == 'number' && value === undefined && !(key in object))) {
-        object[key] = value;
+        baseAssignValue(object, key, value);
       }
     }
 
@@ -2401,7 +2458,7 @@
       var objValue = object[key];
       if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
           (value === undefined && !(key in object))) {
-        object[key] = value;
+        baseAssignValue(object, key, value);
       }
     }
 
@@ -2454,6 +2511,28 @@
       return object && copyObject(source, keys(source), object);
     }
 
+    /**
+     * The base implementation of `assignValue` and `assignMergeValue` without
+     * value checks.
+     *
+     * @private
+     * @param {Object} object The object to modify.
+     * @param {string} key The key of the property to assign.
+     * @param {*} value The value to assign.
+     */
+    function baseAssignValue(object, key, value) {
+      if (key == '__proto__' && defineProperty) {
+        defineProperty(object, key, {
+          'configurable': true,
+          'enumerable': true,
+          'value': value,
+          'writable': true
+        });
+      } else {
+        object[key] = value;
+      }
+    }
+
     /**
      * The base implementation of `_.at` without support for individual paths.
      *
@@ -2534,9 +2613,6 @@
           return cloneBuffer(value, isDeep);
         }
         if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
-          if (isHostObject(value)) {
-            return object ? value : {};
-          }
           result = initCloneObject(isFunc ? {} : value);
           if (!isDeep) {
             return copySymbols(value, baseAssign(result, value));
@@ -3180,8 +3256,8 @@
         othTag = getTag(other);
         othTag = othTag == argsTag ? objectTag : othTag;
       }
-      var objIsObj = objTag == objectTag && !isHostObject(object),
-          othIsObj = othTag == objectTag && !isHostObject(other),
+      var objIsObj = objTag == objectTag,
+          othIsObj = othTag == objectTag,
           isSameTag = objTag == othTag;
 
       if (isSameTag && !objIsObj) {
@@ -3286,7 +3362,7 @@
       if (!isObject(value) || isMasked(value)) {
         return false;
       }
-      var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;
+      var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
       return pattern.test(toSource(value));
     }
 
@@ -3644,7 +3720,7 @@
             value = object[key];
 
         if (predicate(value, key)) {
-          result[key] = value;
+          baseAssignValue(result, key, value);
         }
       }
       return result;
@@ -3810,24 +3886,7 @@
      * @returns {Function} Returns the new function.
      */
     function baseRest(func, start) {
-      start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
-      return function() {
-        var args = arguments,
-            index = -1,
-            length = nativeMax(args.length - start, 0),
-            array = Array(length);
-
-        while (++index < length) {
-          array[index] = args[start + index];
-        }
-        index = -1;
-        var otherArgs = Array(start + 1);
-        while (++index < start) {
-          otherArgs[index] = args[index];
-        }
-        otherArgs[start] = array;
-        return apply(func, this, otherArgs);
-      };
+      return setToString(overRest(func, start, identity), func + '');
     }
 
     /**
@@ -3871,7 +3930,7 @@
     }
 
     /**
-     * The base implementation of `setData` without support for hot loop detection.
+     * The base implementation of `setData` without support for hot loop shorting.
      *
      * @private
      * @param {Function} func The function to associate metadata with.
@@ -3883,6 +3942,23 @@
       return func;
     };
 
+    /**
+     * The base implementation of `setToString` without support for hot loop shorting.
+     *
+     * @private
+     * @param {Function} func The function to modify.
+     * @param {Function} string The `toString` result.
+     * @returns {Function} Returns `func`.
+     */
+    var baseSetToString = !nativeDefineProperty ? identity : function(func, string) {
+      return nativeDefineProperty(func, 'toString', {
+        'configurable': true,
+        'enumerable': false,
+        'value': constant(string),
+        'writable': true
+      });
+    };
+
     /**
      * The base implementation of `_.slice` without an iteratee call guard.
      *
@@ -4297,6 +4373,17 @@
       return isArray(value) ? value : stringToPath(value);
     }
 
+    /**
+     * A `baseRest` alias which can be replaced with `identity` by module
+     * replacement plugins.
+     *
+     * @private
+     * @type {Function}
+     * @param {Function} func The function to apply a rest parameter to.
+     * @returns {Function} Returns the new function.
+     */
+    var castRest = baseRest;
+
     /**
      * Casts `array` to a slice if it's needed.
      *
@@ -4611,6 +4698,7 @@
      * @returns {Object} Returns `object`.
      */
     function copyObject(source, props, object, customizer) {
+      var isNew = !object;
       object || (object = {});
 
       var index = -1,
@@ -4623,7 +4711,14 @@
           ? customizer(object[key], source[key], key, object, source)
           : undefined;
 
-        assignValue(object, key, newValue === undefined ? source[key] : newValue);
+        if (newValue === undefined) {
+          newValue = source[key];
+        }
+        if (isNew) {
+          baseAssignValue(object, key, newValue);
+        } else {
+          assignValue(object, key, newValue);
+        }
       }
       return object;
     }
@@ -4902,9 +4997,7 @@
      * @returns {Function} Returns the new flow function.
      */
     function createFlow(fromRight) {
-      return baseRest(function(funcs) {
-        funcs = baseFlatten(funcs, 1);
-
+      return flatRest(function(funcs) {
         var length = funcs.length,
             index = length,
             prereq = LodashWrapper.prototype.thru;
@@ -5087,11 +5180,8 @@
      * @returns {Function} Returns the new over function.
      */
     function createOver(arrayFunc) {
-      return baseRest(function(iteratees) {
-        iteratees = (iteratees.length == 1 && isArray(iteratees[0]))
-          ? arrayMap(iteratees[0], baseUnary(getIteratee()))
-          : arrayMap(baseFlatten(iteratees, 1), baseUnary(getIteratee()));
-
+      return flatRest(function(iteratees) {
+        iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
         return baseRest(function(args) {
           var thisArg = this;
           return arrayFunc(iteratees, function(iteratee) {
@@ -5434,9 +5524,9 @@
         // Recursively compare arrays (susceptible to call stack limits).
         if (seen) {
           if (!arraySome(other, function(othValue, othIndex) {
-                if (!seen.has(othIndex) &&
+                if (!cacheHas(seen, othIndex) &&
                     (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
-                  return seen.add(othIndex);
+                  return seen.push(othIndex);
                 }
               })) {
             result = false;
@@ -5616,6 +5706,17 @@
       return result;
     }
 
+    /**
+     * A specialized version of `baseRest` which flattens the rest array.
+     *
+     * @private
+     * @param {Function} func The function to apply a rest parameter to.
+     * @returns {Function} Returns the new function.
+     */
+    function flatRest(func) {
+      return setToString(overRest(func, undefined, flatten), func + '');
+    }
+
     /**
      * Creates an array of own enumerable property names and symbols of `object`.
      *
@@ -5784,8 +5885,7 @@
      */
     var getTag = baseGetTag;
 
-    // Fallback for data views, maps, sets, and weak maps in IE 11,
-    // for data views in Edge < 14, and promises in Node.js.
+    // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
     if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
         (Map && getTag(new Map) != mapTag) ||
         (Promise && getTag(Promise.resolve()) != promiseTag) ||
@@ -5861,9 +5961,9 @@
     function hasPath(object, path, hasFunc) {
       path = isKey(path, object) ? [path] : castPath(path);
 
-      var result,
-          index = -1,
-          length = path.length;
+      var index = -1,
+          length = path.length,
+          result = false;
 
       while (++index < length) {
         var key = toKey(path[index]);
@@ -5872,10 +5972,10 @@
         }
         object = object[key];
       }
-      if (result) {
+      if (result || ++index != length) {
         return result;
       }
-      var length = object ? object.length : 0;
+      length = object ? object.length : 0;
       return !!length && isLength(length) && isIndex(key, length) &&
         (isArray(object) || isArguments(object));
     }
@@ -5970,9 +6070,11 @@
      * @returns {string} Returns the modified source.
      */
     function insertWrapDetails(source, details) {
-      var length = details.length,
-          lastIndex = length - 1;
-
+      var length = details.length;
+      if (!length) {
+        return source;
+      }
+      var lastIndex = length - 1;
       details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
       details = details.join(length > 2 ? ', ' : ' ');
       return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
@@ -6151,6 +6253,26 @@
       };
     }
 
+    /**
+     * A specialized version of `_.memoize` which clears the memoized function's
+     * cache when it exceeds `MAX_MEMOIZE_SIZE`.
+     *
+     * @private
+     * @param {Function} func The function to have its output memoized.
+     * @returns {Function} Returns the new memoized function.
+     */
+    function memoizeCapped(func) {
+      var result = memoize(func, function(key) {
+        if (cache.size === MAX_MEMOIZE_SIZE) {
+          cache.clear();
+        }
+        return key;
+      });
+
+      var cache = result.cache;
+      return result;
+    }
+
     /**
      * Merges the function metadata of `source` into `data`.
      *
@@ -6264,6 +6386,36 @@
       return result;
     }
 
+    /**
+     * A specialized version of `baseRest` which transforms the rest array.
+     *
+     * @private
+     * @param {Function} func The function to apply a rest parameter to.
+     * @param {number} [start=func.length-1] The start position of the rest parameter.
+     * @param {Function} transform The rest array transform.
+     * @returns {Function} Returns the new function.
+     */
+    function overRest(func, start, transform) {
+      start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
+      return function() {
+        var args = arguments,
+            index = -1,
+            length = nativeMax(args.length - start, 0),
+            array = Array(length);
+
+        while (++index < length) {
+          array[index] = args[start + index];
+        }
+        index = -1;
+        var otherArgs = Array(start + 1);
+        while (++index < start) {
+          otherArgs[index] = args[index];
+        }
+        otherArgs[start] = transform(array);
+        return apply(func, this, otherArgs);
+      };
+    }
+
     /**
      * Gets the parent value at `path` of `object`.
      *
@@ -6312,25 +6464,7 @@
      * @param {*} data The metadata.
      * @returns {Function} Returns `func`.
      */
-    var setData = (function() {
-      var count = 0,
-          lastCalled = 0;
-
-      return function(key, value) {
-        var stamp = now(),
-            remaining = HOT_SPAN - (stamp - lastCalled);
-
-        lastCalled = stamp;
-        if (remaining > 0) {
-          if (++count >= HOT_COUNT) {
-            return key;
-          }
-        } else {
-          count = 0;
-        }
-        return baseSetData(key, value);
-      };
-    }());
+    var setData = shortOut(baseSetData);
 
     /**
      * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
@@ -6344,6 +6478,16 @@
       return root.setTimeout(func, wait);
     };
 
+    /**
+     * Sets the `toString` method of `func` to return `string`.
+     *
+     * @private
+     * @param {Function} func The function to modify.
+     * @param {Function} string The `toString` result.
+     * @returns {Function} Returns `func`.
+     */
+    var setToString = shortOut(baseSetToString);
+
     /**
      * 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.
@@ -6354,14 +6498,61 @@
      * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
      * @returns {Function} Returns `wrapper`.
      */
-    var setWrapToString = !defineProperty ? identity : function(wrapper, reference, bitmask) {
+    function setWrapToString(wrapper, reference, bitmask) {
       var source = (reference + '');
-      return defineProperty(wrapper, 'toString', {
-        'configurable': true,
-        'enumerable': false,
-        'value': constant(insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)))
-      });
-    };
+      return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
+    }
+
+    /**
+     * Creates a function that'll short out and invoke `identity` instead
+     * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
+     * milliseconds.
+     *
+     * @private
+     * @param {Function} func The function to restrict.
+     * @returns {Function} Returns the new shortable function.
+     */
+    function shortOut(func) {
+      var count = 0,
+          lastCalled = 0;
+
+      return function() {
+        var stamp = nativeNow(),
+            remaining = HOT_SPAN - (stamp - lastCalled);
+
+        lastCalled = stamp;
+        if (remaining > 0) {
+          if (++count >= HOT_COUNT) {
+            return arguments[0];
+          }
+        } else {
+          count = 0;
+        }
+        return func.apply(undefined, arguments);
+      };
+    }
+
+    /**
+     * A specialized version of `arrayShuffle` which mutates `array`.
+     *
+     * @private
+     * @param {Array} array The array to shuffle.
+     * @returns {Array} Returns `array`.
+     */
+    function shuffleSelf(array) {
+      var index = -1,
+          length = array.length,
+          lastIndex = length - 1;
+
+      while (++index < length) {
+        var rand = baseRandom(index, lastIndex),
+            value = array[rand];
+
+        array[rand] = array[index];
+        array[index] = value;
+      }
+      return array;
+    }
 
     /**
      * Converts `string` to a property path array.
@@ -6370,7 +6561,7 @@
      * @param {string} string The string to convert.
      * @returns {Array} Returns the property path array.
      */
-    var stringToPath = memoize(function(string) {
+    var stringToPath = memoizeCapped(function(string) {
       string = toString(string);
 
       var result = [];
@@ -6549,24 +6740,25 @@
      * // => [1]
      */
     function concat() {
-      var length = arguments.length,
-          args = Array(length ? length - 1 : 0),
+      var length = arguments.length;
+      if (!length) {
+        return [];
+      }
+      var args = Array(length - 1),
           array = arguments[0],
           index = length;
 
       while (index--) {
         args[index - 1] = arguments[index];
       }
-      return length
-        ? arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1))
-        : [];
+      return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
     }
 
     /**
      * Creates an array of `array` values not included in the other given arrays
      * 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.
+     * for equality comparisons. The order and references of result values are
+     * determined by the first array.
      *
      * **Note:** Unlike `_.pullAll`, this method returns a new array.
      *
@@ -6592,8 +6784,9 @@
     /**
      * This method is like `_.difference` except that it accepts `iteratee` which
      * is invoked for each element of `array` and `values` to generate the criterion
-     * by which they're compared. Result values are chosen from the first array.
-     * The iteratee is invoked with one argument: (value).
+     * by which they're compared. The order and references of result values are
+     * determined by the first array. The iteratee is invoked with one argument:
+     * (value).
      *
      * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
      *
@@ -6626,9 +6819,9 @@
 
     /**
      * This method is like `_.difference` except that it accepts `comparator`
-     * which is invoked to compare elements of `array` to `values`. Result values
-     * are chosen from the first array. The comparator is invoked with two arguments:
-     * (arrVal, othVal).
+     * which is invoked to compare elements of `array` to `values`. The order and
+     * references of result values are determined by the first array. The comparator
+     * is invoked with two arguments: (arrVal, othVal).
      *
      * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
      *
@@ -7122,8 +7315,8 @@
     /**
      * Creates an array of unique values that are included in all given arrays
      * 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.
+     * for equality comparisons. The order and references of result values are
+     * determined by the first array.
      *
      * @static
      * @memberOf _
@@ -7146,8 +7339,9 @@
     /**
      * This method is like `_.intersection` except that it accepts `iteratee`
      * which is invoked for each element of each `arrays` to generate the criterion
-     * by which they're compared. Result values are chosen from the first array.
-     * The iteratee is invoked with one argument: (value).
+     * by which they're compared. The order and references of result values are
+     * determined by the first array. The iteratee is invoked with one argument:
+     * (value).
      *
      * @static
      * @memberOf _
@@ -7181,9 +7375,9 @@
 
     /**
      * This method is like `_.intersection` except that it accepts `comparator`
-     * which is invoked to compare elements of `arrays`. Result values are chosen
-     * from the first array. The comparator is invoked with two arguments:
-     * (arrVal, othVal).
+     * which is invoked to compare elements of `arrays`. The order and references
+     * of result values are determined by the first array. The comparator is
+     * invoked with two arguments: (arrVal, othVal).
      *
      * @static
      * @memberOf _
@@ -7281,21 +7475,11 @@
       var index = length;
       if (fromIndex !== undefined) {
         index = toInteger(fromIndex);
-        index = (
-          index < 0
-            ? nativeMax(length + index, 0)
-            : nativeMin(index, length - 1)
-        ) + 1;
+        index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
       }
-      if (value !== value) {
-        return baseFindIndex(array, baseIsNaN, index - 1, true);
-      }
-      while (index--) {
-        if (array[index] === value) {
-          return index;
-        }
-      }
-      return -1;
+      return value === value
+        ? strictLastIndexOf(array, value, index)
+        : baseFindIndex(array, baseIsNaN, index, true);
     }
 
     /**
@@ -7457,9 +7641,7 @@
      * console.log(pulled);
      * // => ['b', 'd']
      */
-    var pullAt = baseRest(function(array, indexes) {
-      indexes = baseFlatten(indexes, 1);
-
+    var pullAt = flatRest(function(array, indexes) {
       var length = array ? array.length : 0,
           result = baseAt(array, indexes);
 
@@ -8034,8 +8216,9 @@
     /**
      * Creates a duplicate-free version of an array, using
      * [`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.
+     * for equality comparisons, in which only the first occurrence of each element
+     * is kept. The order of result values is determined by the order they occur
+     * in the array.
      *
      * @static
      * @memberOf _
@@ -8057,7 +8240,9 @@
     /**
      * This method is like `_.uniq` except that it accepts `iteratee` which is
      * invoked for each element in `array` to generate the criterion by which
-     * uniqueness is computed. The iteratee is invoked with one argument: (value).
+     * uniqueness is computed. The order of result values is determined by the
+     * order they occur in the array. The iteratee is invoked with one argument:
+     * (value).
      *
      * @static
      * @memberOf _
@@ -8084,8 +8269,9 @@
 
     /**
      * This method is like `_.uniq` except that it accepts `comparator` which
-     * is invoked to compare elements of `array`. The comparator is invoked with
-     * two arguments: (arrVal, othVal).
+     * is invoked to compare elements of `array`. The order of result values is
+     * determined by the order they occur in the array.The comparator is invoked
+     * with two arguments: (arrVal, othVal).
      *
      * @static
      * @memberOf _
@@ -8227,8 +8413,9 @@
     /**
      * This method is like `_.xor` except that it accepts `iteratee` which is
      * invoked for each element of each `arrays` to generate the criterion by
-     * which by which they're compared. The iteratee is invoked with one argument:
-     * (value).
+     * which by which they're compared. The order of result values is determined
+     * by the order they occur in the arrays. The iteratee is invoked with one
+     * argument: (value).
      *
      * @static
      * @memberOf _
@@ -8257,8 +8444,9 @@
 
     /**
      * This method is like `_.xor` except that it accepts `comparator` which is
-     * invoked to compare elements of `arrays`. The comparator is invoked with
-     * two arguments: (arrVal, othVal).
+     * invoked to compare elements of `arrays`. The order of result values is
+     * determined by the order they occur in the arrays. The comparator is invoked
+     * with two arguments: (arrVal, othVal).
      *
      * @static
      * @memberOf _
@@ -8475,8 +8663,7 @@
      * _(object).at(['a[0].b.c', 'a[1]']).value();
      * // => [3, 4]
      */
-    var wrapperAt = baseRest(function(paths) {
-      paths = baseFlatten(paths, 1);
+    var wrapperAt = flatRest(function(paths) {
       var length = paths.length,
           start = length ? paths[0] : 0,
           value = this.__wrapped__,
@@ -8741,7 +8928,11 @@
      * // => { '3': 2, '5': 1 }
      */
     var countBy = createAggregator(function(result, value, key) {
-      hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1);
+      if (hasOwnProperty.call(result, key)) {
+        ++result[key];
+      } else {
+        baseAssignValue(result, key, 1);
+      }
     });
 
     /**
@@ -8996,7 +9187,7 @@
      * @see _.forEachRight
      * @example
      *
-     * _([1, 2]).forEach(function(value) {
+     * _.forEach([1, 2], function(value) {
      *   console.log(value);
      * });
      * // => Logs `1` then `2`.
@@ -9064,7 +9255,7 @@
       if (hasOwnProperty.call(result, key)) {
         result[key].push(value);
       } else {
-        result[key] = [value];
+        baseAssignValue(result, key, [value]);
       }
     });
 
@@ -9177,7 +9368,7 @@
      * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
      */
     var keyBy = createAggregator(function(result, value, key) {
-      result[key] = value;
+      baseAssignValue(result, key, value);
     });
 
     /**
@@ -9437,10 +9628,7 @@
      * // => 2
      */
     function sample(collection) {
-      var array = isArrayLike(collection) ? collection : values(collection),
-          length = array.length;
-
-      return length > 0 ? array[baseRandom(0, length - 1)] : undefined;
+      return arraySample(isArrayLike(collection) ? collection : values(collection));
     }
 
     /**
@@ -9464,25 +9652,12 @@
      * // => [2, 3, 1]
      */
     function sampleSize(collection, n, guard) {
-      var index = -1,
-          result = toArray(collection),
-          length = result.length,
-          lastIndex = length - 1;
-
       if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
         n = 1;
       } else {
-        n = baseClamp(toInteger(n), 0, length);
+        n = toInteger(n);
       }
-      while (++index < n) {
-        var rand = baseRandom(index, lastIndex),
-            value = result[rand];
-
-        result[rand] = result[index];
-        result[index] = value;
-      }
-      result.length = n;
-      return result;
+      return arraySampleSize(isArrayLike(collection) ? collection : values(collection), n);
     }
 
     /**
@@ -9501,7 +9676,10 @@
      * // => [4, 1, 3, 2]
      */
     function shuffle(collection) {
-      return sampleSize(collection, MAX_ARRAY_LENGTH);
+      return shuffleSelf(isArrayLike(collection)
+        ? copyArray(collection)
+        : values(collection)
+      );
     }
 
     /**
@@ -9606,16 +9784,11 @@
      *   { 'user': 'barney', 'age': 34 }
      * ];
      *
-     * _.sortBy(users, function(o) { return o.user; });
+     * _.sortBy(users, [function(o) { return o.user; }]);
      * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
      *
      * _.sortBy(users, ['user', 'age']);
      * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
-     *
-     * _.sortBy(users, 'user', function(o) {
-     *   return Math.floor(o.age / 10);
-     * });
-     * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
      */
     var sortBy = baseRest(function(collection, iteratees) {
       if (collection == null) {
@@ -10130,7 +10303,7 @@
      * _.defer(function(text) {
      *   console.log(text);
      * }, 'deferred');
-     * // => Logs 'deferred' after one or more milliseconds.
+     * // => Logs 'deferred' after one millisecond.
      */
     var defer = baseRest(function(func, args) {
       return baseDelay(func, 1, args);
@@ -10238,14 +10411,14 @@
           return cache.get(key);
         }
         var result = func.apply(this, args);
-        memoized.cache = cache.set(key, result);
+        memoized.cache = cache.set(key, result) || cache;
         return result;
       };
       memoized.cache = new (memoize.Cache || MapCache);
       return memoized;
     }
 
-    // Assign cache to `_.memoize`.
+    // Expose `MapCache`.
     memoize.Cache = MapCache;
 
     /**
@@ -10337,7 +10510,7 @@
      * func(10, 5);
      * // => [100, 10]
      */
-    var overArgs = baseRest(function(func, transforms) {
+    var overArgs = castRest(function(func, transforms) {
       transforms = (transforms.length == 1 && isArray(transforms[0]))
         ? arrayMap(transforms[0], baseUnary(getIteratee()))
         : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
@@ -10451,8 +10624,8 @@
      * rearged('b', 'c', 'a')
      * // => ['a', 'b', 'c']
      */
-    var rearg = baseRest(function(func, indexes) {
-      return createWrap(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes, 1));
+    var rearg = flatRest(function(func, indexes) {
+      return createWrap(func, REARG_FLAG, undefined, undefined, undefined, indexes);
     });
 
     /**
@@ -11128,7 +11301,7 @@
      * // => false
      */
     function isElement(value) {
-      return !!value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
+      return value != null && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);
     }
 
     /**
@@ -11174,7 +11347,7 @@
       if (tag == mapTag || tag == setTag) {
         return !value.size;
       }
-      if (nonEnumShadows || isPrototype(value)) {
+      if (isPrototype(value)) {
         return !nativeKeys(value).length;
       }
       for (var key in value) {
@@ -11423,7 +11596,7 @@
      */
     function isObject(value) {
       var type = typeof value;
-      return !!value && (type == 'object' || type == 'function');
+      return value != null && (type == 'object' || type == 'function');
     }
 
     /**
@@ -11451,7 +11624,7 @@
      * // => false
      */
     function isObjectLike(value) {
-      return !!value && typeof value == 'object';
+      return value != null && typeof value == 'object';
     }
 
     /**
@@ -11715,8 +11888,7 @@
      * // => true
      */
     function isPlainObject(value) {
-      if (!isObjectLike(value) ||
-          objectToString.call(value) != objectTag || isHostObject(value)) {
+      if (!isObjectLike(value) || objectToString.call(value) != objectTag) {
         return false;
       }
       var proto = getPrototype(value);
@@ -12273,7 +12445,7 @@
      * // => { 'a': 1, 'c': 3 }
      */
     var assign = createAssigner(function(object, source) {
-      if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
+      if (isPrototype(source) || isArrayLike(source)) {
         copyObject(source, keys(source), object);
         return;
       }
@@ -12401,9 +12573,7 @@
      * _.at(object, ['a[0].b.c', 'a[1]']);
      * // => [3, 4]
      */
-    var at = baseRest(function(object, paths) {
-      return baseAt(object, baseFlatten(paths, 1));
-    });
+    var at = flatRest(baseAt);
 
     /**
      * Creates an object that inherits from the `prototype` object. If a
@@ -13006,7 +13176,7 @@
       iteratee = getIteratee(iteratee, 3);
 
       baseForOwn(object, function(value, key, object) {
-        result[iteratee(value, key, object)] = value;
+        baseAssignValue(result, iteratee(value, key, object), value);
       });
       return result;
     }
@@ -13044,7 +13214,7 @@
       iteratee = getIteratee(iteratee, 3);
 
       baseForOwn(object, function(value, key, object) {
-        result[key] = iteratee(value, key, object);
+        baseAssignValue(result, key, iteratee(value, key, object));
       });
       return result;
     }
@@ -13088,7 +13258,7 @@
      * This method is like `_.merge` except that it accepts `customizer` which
      * is invoked to produce the merged values of the destination and source
      * properties. If `customizer` returns `undefined`, merging is handled by the
-     * method instead. The `customizer` is invoked with seven arguments:
+     * method instead. The `customizer` is invoked with six arguments:
      * (objValue, srcValue, key, object, source, stack).
      *
      * **Note:** This method mutates `object`.
@@ -13138,11 +13308,11 @@
      * _.omit(object, ['a', 'c']);
      * // => { 'b': '2' }
      */
-    var omit = baseRest(function(object, props) {
+    var omit = flatRest(function(object, props) {
       if (object == null) {
         return {};
       }
-      props = arrayMap(baseFlatten(props, 1), toKey);
+      props = arrayMap(props, toKey);
       return basePick(object, baseDifference(getAllKeysIn(object), props));
     });
 
@@ -13187,8 +13357,8 @@
      * _.pick(object, ['a', 'c']);
      * // => { 'a': 1, 'c': 3 }
      */
-    var pick = baseRest(function(object, props) {
-      return object == null ? {} : basePick(object, arrayMap(baseFlatten(props, 1), toKey));
+    var pick = flatRest(function(object, props) {
+      return object == null ? {} : basePick(object, arrayMap(props, toKey));
     });
 
     /**
@@ -13842,8 +14012,8 @@
     }
 
     /**
-     * Converts the characters "&", "<", ">", '"', "'", and "\`" in `string` to
-     * their corresponding HTML entities.
+     * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
+     * corresponding HTML entities.
      *
      * **Note:** No other characters are escaped. To escape additional
      * characters use a third-party library like [_he_](https://mths.be/he).
@@ -13854,12 +14024,6 @@
      * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
      * (under "semi-related fun fact") for more details.
      *
-     * Backticks are escaped because in IE < 9, they can break out of
-     * attribute values or HTML comments. See [#59](https://html5sec.org/#59),
-     * [#102](https://html5sec.org/#102), [#108](https://html5sec.org/#108), and
-     * [#133](https://html5sec.org/#133) of the
-     * [HTML5 Security Cheatsheet](https://html5sec.org/) for more details.
-     *
      * When working with HTML you should always
      * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
      * XSS vectors.
@@ -14102,15 +14266,12 @@
      * // => [6, 8, 10]
      */
     function parseInt(string, radix, guard) {
-      // Chrome fails to trim leading <BOM> whitespace characters.
-      // See https://bugs.chromium.org/p/v8/issues/detail?id=3109 for more details.
       if (guard || radix == null) {
         radix = 0;
       } else if (radix) {
         radix = +radix;
       }
-      string = toString(string).replace(reTrim, '');
-      return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
+      return nativeParseInt(toString(string), radix || 0);
     }
 
     /**
@@ -14349,7 +14510,8 @@
      * compiled({ 'user': 'barney' });
      * // => 'hello barney!'
      *
-     * // Use the ES delimiter as an alternative to the default "interpolate" delimiter.
+     * // Use the ES template literal delimiter as an "interpolate" delimiter.
+     * // Disable support by replacing the "interpolate" delimiter.
      * var compiled = _.template('hello ${ user }!');
      * compiled({ 'user': 'pebbles' });
      * // => 'hello pebbles!'
@@ -14750,7 +14912,7 @@
 
     /**
      * The inverse of `_.escape`; this method converts the HTML entities
-     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, `&#39;`, and `&#96;` in `string` to
+     * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
      * their corresponding characters.
      *
      * **Note:** No other HTML entities are unescaped. To unescape additional
@@ -14904,10 +15066,10 @@
      * jQuery(element).on('click', view.click);
      * // => Logs 'clicked docs' when clicked.
      */
-    var bindAll = baseRest(function(object, methodNames) {
-      arrayEach(baseFlatten(methodNames, 1), function(key) {
+    var bindAll = flatRest(function(object, methodNames) {
+      arrayEach(methodNames, function(key) {
         key = toKey(key);
-        object[key] = bind(object[key], object);
+        baseAssignValue(object, key, bind(object[key], object));
       });
       return object;
     });
diff --git a/lodash.min.js b/lodash.min.js
index 867ecf2a3..1168cf78b 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -2,131 +2,131 @@
  * @license
  * lodash lodash.com/license | Underscore.js 1.8.3 underscorejs.org/LICENSE
  */
-;(function(){function t(t,n){return t.set(n[0],n[1]),t}function n(t,n){return t.add(n),t}function r(t,n,r){switch(r.length){case 0:return t.call(n);case 1:return t.call(n,r[0]);case 2:return t.call(n,r[0],r[1]);case 3:return t.call(n,r[0],r[1],r[2])}return t.apply(n,r)}function e(t,n,r,e){for(var u=-1,o=t?t.length:0;++u<o;){var i=t[u];n(e,i,r(i),t)}return e}function u(t,n){for(var r=-1,e=t?t.length:0;++r<e&&false!==n(t[r],r,t););return t}function o(t,n){for(var r=t?t.length:0;r--&&false!==n(t[r],r,t););
-return t}function i(t,n){for(var r=-1,e=t?t.length:0;++r<e;)if(!n(t[r],r,t))return false;return true}function f(t,n){for(var r=-1,e=t?t.length:0,u=0,o=[];++r<e;){var i=t[r];n(i,r,t)&&(o[u++]=i)}return o}function c(t,n){return!(!t||!t.length)&&-1<d(t,n,0)}function a(t,n,r){for(var e=-1,u=t?t.length:0;++e<u;)if(r(n,t[e]))return true;return false}function l(t,n){for(var r=-1,e=t?t.length:0,u=Array(e);++r<e;)u[r]=n(t[r],r,t);return u}function s(t,n){for(var r=-1,e=n.length,u=t.length;++r<e;)t[u+r]=n[r];return t}function h(t,n,r,e){
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+},Ot.prototype.toJSON=Ot.prototype.valueOf=Ot.prototype.value=function(){return br(this.__wrapped__,this.__actions__)},Ot.prototype.first=Ot.prototype.head,ai&&(Ot.prototype[ai]=Pe),Ot}var N,P=1/0,Z=NaN,q=[["ary",128],["bind",1],["bindKey",2],["curry",8],["curryRight",16],["flip",512],["partial",32],["partialRight",64],["rearg",256]],V=/\b__p\+='';/g,K=/\b(__p\+=)''\+/g,G=/(__e\(.*?\)|\b__t\))\+'';/g,J=/&(?:amp|lt|gt|quot|#39|#96);/g,Y=/[&<>"'`]/g,H=RegExp(J.source),Q=RegExp(Y.source),X=/<%-([\s\S]+?)%>/g,tt=/<%([\s\S]+?)%>/g,nt=/<%=([\s\S]+?)%>/g,rt=/\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,et=/^\w*$/,ut=/^\./,it=/[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g,ot=/[\\^$.*+?()[\]{}|]/g,ft=RegExp(ot.source),ct=/^\s+|\s+$/g,at=/^\s+/,lt=/\s+$/,st=/\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,ht=/\{\n\/\* \[wrapped with (.+)\] \*/,pt=/,? & /,_t=/[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g,vt=/\\(\\)?/g,gt=/\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g,dt=/\w*$/,yt=/^[-+]0x[0-9a-f]+$/i,bt=/^0b[01]+$/i,xt=/^\[object .+?Constructor\]$/,jt=/^0o[0-7]+$/i,wt=/^(?:0|[1-9]\d*)$/,mt=/[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g,At=/($^)/,kt=/['\n\r\u2028\u2029\\]/g,Et="[\\ufe0e\\ufe0f]?(?:[\\u0300-\\u036f\\ufe20-\\ufe23\\u20d0-\\u20f0]|\\ud83c[\\udffb-\\udfff])?(?:\\u200d(?:[^\\ud800-\\udfff]|(?:\\ud83c[\\udde6-\\uddff]){2}|[\\ud800-\\udbff][\\udc00-\\udfff])[\\ufe0e\\ufe0f]?(?:[\\u0300-\\u036f\\ufe20-\\ufe23\\u20d0-\\u20f0]|\\ud83c[\\udffb-\\udfff])?)*",Ot="(?:[\\u2700-\\u27bf]|(?:\\ud83c[\\udde6-\\uddff]){2}|[\\ud800-\\udbff][\\udc00-\\udfff])"+Et,St="(?:[^\\ud800-\\udfff][\\u0300-\\u036f\\ufe20-\\ufe23\\u20d0-\\u20f0]?|[\\u0300-\\u036f\\ufe20-\\ufe23\\u20d0-\\u20f0]|(?:\\ud83c[\\udde6-\\uddff]){2}|[\\ud800-\\udbff][\\udc00-\\udfff]|[\\ud800-\\udfff])",It=RegExp("['\u2019]","g"),Rt=RegExp("[\\u0300-\\u036f\\ufe20-\\ufe23\\u20d0-\\u20f0]","g"),zt=RegExp("\\ud83c[\\udffb-\\udfff](?=\\ud83c[\\udffb-\\udfff])|"+St+Et,"g"),Wt=RegExp(["[A-Z\\xc0-\\xd6\\xd8-\\xde]?[a-z\\xdf-\\xf6\\xf8-\\xff]+(?:['\u2019](?:d|ll|m|re|s|t|ve))?(?=[\\xac\\xb1\\xd7\\xf7\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf\\u2000-\\u206f \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000]|[A-Z\\xc0-\\xd6\\xd8-\\xde]|$)|(?:[A-Z\\xc0-\\xd6\\xd8-\\xde]|[^\\ud800-\\udfff\\xac\\xb1\\xd7\\xf7\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf\\u2000-\\u206f \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000\\d+\\u2700-\\u27bfa-z\\xdf-\\xf6\\xf8-\\xffA-Z\\xc0-\\xd6\\xd8-\\xde])+(?:['\u2019](?:D|LL|M|RE|S|T|VE))?(?=[\\xac\\xb1\\xd7\\xf7\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf\\u2000-\\u206f \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000]|[A-Z\\xc0-\\xd6\\xd8-\\xde](?:[a-z\\xdf-\\xf6\\xf8-\\xff]|[^\\ud800-\\udfff\\xac\\xb1\\xd7\\xf7\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf\\u2000-\\u206f \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000\\d+\\u2700-\\u27bfa-z\\xdf-\\xf6\\xf8-\\xffA-Z\\xc0-\\xd6\\xd8-\\xde])|$)|[A-Z\\xc0-\\xd6\\xd8-\\xde]?(?:[a-z\\xdf-\\xf6\\xf8-\\xff]|[^\\ud800-\\udfff\\xac\\xb1\\xd7\\xf7\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf\\u2000-\\u206f \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000\\d+\\u2700-\\u27bfa-z\\xdf-\\xf6\\xf8-\\xffA-Z\\xc0-\\xd6\\xd8-\\xde])+(?:['\u2019](?:d|ll|m|re|s|t|ve))?|[A-Z\\xc0-\\xd6\\xd8-\\xde]+(?:['\u2019](?:D|LL|M|RE|S|T|VE))?|\\d+",Ot].join("|"),"g"),Bt=RegExp("[\\u200d\\ud800-\\udfff\\u0300-\\u036f\\ufe20-\\ufe23\\u20d0-\\u20f0\\ufe0e\\ufe0f]"),Lt=/[a-z][A-Z]|[A-Z]{2,}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/,Ct="Array Buffer DataView Date Error Float32Array Float64Array Function Int8Array Int16Array Int32Array Map Math Object Promise RegExp Set String Symbol TypeError Uint8Array Uint8ClampedArray Uint16Array Uint32Array WeakMap _ clearTimeout isFinite parseInt setTimeout".split(" "),Ut={};
+Ut["[object Float32Array]"]=Ut["[object Float64Array]"]=Ut["[object Int8Array]"]=Ut["[object Int16Array]"]=Ut["[object Int32Array]"]=Ut["[object Uint8Array]"]=Ut["[object Uint8ClampedArray]"]=Ut["[object Uint16Array]"]=Ut["[object Uint32Array]"]=true,Ut["[object Arguments]"]=Ut["[object Array]"]=Ut["[object ArrayBuffer]"]=Ut["[object Boolean]"]=Ut["[object DataView]"]=Ut["[object Date]"]=Ut["[object Error]"]=Ut["[object Function]"]=Ut["[object Map]"]=Ut["[object Number]"]=Ut["[object Object]"]=Ut["[object RegExp]"]=Ut["[object Set]"]=Ut["[object String]"]=Ut["[object WeakMap]"]=false;
+var Mt={};Mt["[object Arguments]"]=Mt["[object Array]"]=Mt["[object ArrayBuffer]"]=Mt["[object DataView]"]=Mt["[object Boolean]"]=Mt["[object Date]"]=Mt["[object Float32Array]"]=Mt["[object Float64Array]"]=Mt["[object Int8Array]"]=Mt["[object Int16Array]"]=Mt["[object Int32Array]"]=Mt["[object Map]"]=Mt["[object Number]"]=Mt["[object Object]"]=Mt["[object RegExp]"]=Mt["[object Set]"]=Mt["[object String]"]=Mt["[object Symbol]"]=Mt["[object Uint8Array]"]=Mt["[object Uint8ClampedArray]"]=Mt["[object Uint16Array]"]=Mt["[object Uint32Array]"]=true,
+Mt["[object Error]"]=Mt["[object Function]"]=Mt["[object WeakMap]"]=false;var Dt,Tt={"\\":"\\","'":"'","\n":"n","\r":"r","\u2028":"u2028","\u2029":"u2029"},$t=parseFloat,Ft=parseInt,Nt=typeof global=="object"&&global&&global.Object===Object&&global,Pt=typeof self=="object"&&self&&self.Object===Object&&self,Zt=Nt||Pt||Function("return this")(),qt=typeof exports=="object"&&exports&&!exports.nodeType&&exports,Vt=qt&&typeof module=="object"&&module&&!module.nodeType&&module,Kt=Vt&&Vt.exports===qt,Gt=Kt&&Nt.g;
+t:{try{Dt=Gt&&Gt.f("util");break t}catch(t){}Dt=void 0}var Jt=Dt&&Dt.isArrayBuffer,Yt=Dt&&Dt.isDate,Ht=Dt&&Dt.isMap,Qt=Dt&&Dt.isRegExp,Xt=Dt&&Dt.isSet,tn=Dt&&Dt.isTypedArray,nn=j("length"),rn=w({"\xc0":"A","\xc1":"A","\xc2":"A","\xc3":"A","\xc4":"A","\xc5":"A","\xe0":"a","\xe1":"a","\xe2":"a","\xe3":"a","\xe4":"a","\xe5":"a","\xc7":"C","\xe7":"c","\xd0":"D","\xf0":"d","\xc8":"E","\xc9":"E","\xca":"E","\xcb":"E","\xe8":"e","\xe9":"e","\xea":"e","\xeb":"e","\xcc":"I","\xcd":"I","\xce":"I","\xcf":"I",
 "\xec":"i","\xed":"i","\xee":"i","\xef":"i","\xd1":"N","\xf1":"n","\xd2":"O","\xd3":"O","\xd4":"O","\xd5":"O","\xd6":"O","\xd8":"O","\xf2":"o","\xf3":"o","\xf4":"o","\xf5":"o","\xf6":"o","\xf8":"o","\xd9":"U","\xda":"U","\xdb":"U","\xdc":"U","\xf9":"u","\xfa":"u","\xfb":"u","\xfc":"u","\xdd":"Y","\xfd":"y","\xff":"y","\xc6":"Ae","\xe6":"ae","\xde":"Th","\xfe":"th","\xdf":"ss","\u0100":"A","\u0102":"A","\u0104":"A","\u0101":"a","\u0103":"a","\u0105":"a","\u0106":"C","\u0108":"C","\u010a":"C","\u010c":"C",
 "\u0107":"c","\u0109":"c","\u010b":"c","\u010d":"c","\u010e":"D","\u0110":"D","\u010f":"d","\u0111":"d","\u0112":"E","\u0114":"E","\u0116":"E","\u0118":"E","\u011a":"E","\u0113":"e","\u0115":"e","\u0117":"e","\u0119":"e","\u011b":"e","\u011c":"G","\u011e":"G","\u0120":"G","\u0122":"G","\u011d":"g","\u011f":"g","\u0121":"g","\u0123":"g","\u0124":"H","\u0126":"H","\u0125":"h","\u0127":"h","\u0128":"I","\u012a":"I","\u012c":"I","\u012e":"I","\u0130":"I","\u0129":"i","\u012b":"i","\u012d":"i","\u012f":"i",
 "\u0131":"i","\u0134":"J","\u0135":"j","\u0136":"K","\u0137":"k","\u0138":"k","\u0139":"L","\u013b":"L","\u013d":"L","\u013f":"L","\u0141":"L","\u013a":"l","\u013c":"l","\u013e":"l","\u0140":"l","\u0142":"l","\u0143":"N","\u0145":"N","\u0147":"N","\u014a":"N","\u0144":"n","\u0146":"n","\u0148":"n","\u014b":"n","\u014c":"O","\u014e":"O","\u0150":"O","\u014d":"o","\u014f":"o","\u0151":"o","\u0154":"R","\u0156":"R","\u0158":"R","\u0155":"r","\u0157":"r","\u0159":"r","\u015a":"S","\u015c":"S","\u015e":"S",
 "\u0160":"S","\u015b":"s","\u015d":"s","\u015f":"s","\u0161":"s","\u0162":"T","\u0164":"T","\u0166":"T","\u0163":"t","\u0165":"t","\u0167":"t","\u0168":"U","\u016a":"U","\u016c":"U","\u016e":"U","\u0170":"U","\u0172":"U","\u0169":"u","\u016b":"u","\u016d":"u","\u016f":"u","\u0171":"u","\u0173":"u","\u0174":"W","\u0175":"w","\u0176":"Y","\u0177":"y","\u0178":"Y","\u0179":"Z","\u017b":"Z","\u017d":"Z","\u017a":"z","\u017c":"z","\u017e":"z","\u0132":"IJ","\u0133":"ij","\u0152":"Oe","\u0153":"oe","\u0149":"'n",
-"\u017f":"ss"}),on=w({"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;","`":"&#96;"}),fn=w({"&amp;":"&","&lt;":"<","&gt;":">","&quot;":'"',"&#39;":"'","&#96;":"`"}),cn=N();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(Vt._=cn, define(function(){return cn})):Gt?((Gt.exports=cn)._=cn,Kt._=cn):Vt._=cn}).call(this);
\ No newline at end of file
+"\u017f":"s"}),en=w({"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"}),un=w({"&amp;":"&","&lt;":"<","&gt;":">","&quot;":'"',"&#39;":"'"}),on=F();typeof define=="function"&&typeof define.amd=="object"&&define.amd?(Zt._=on, define(function(){return on})):Vt?((Vt.exports=on)._=on,qt._=on):Zt._=on}).call(this);
\ No newline at end of file
diff --git a/mapKeys.js b/mapKeys.js
index ef73c5251..3b68797db 100644
--- a/mapKeys.js
+++ b/mapKeys.js
@@ -1,4 +1,5 @@
-var baseForOwn = require('./_baseForOwn'),
+var baseAssignValue = require('./_baseAssignValue'),
+    baseForOwn = require('./_baseForOwn'),
     baseIteratee = require('./_baseIteratee');
 
 /**
@@ -27,7 +28,7 @@ function mapKeys(object, iteratee) {
   iteratee = baseIteratee(iteratee, 3);
 
   baseForOwn(object, function(value, key, object) {
-    result[iteratee(value, key, object)] = value;
+    baseAssignValue(result, iteratee(value, key, object), value);
   });
   return result;
 }
diff --git a/mapValues.js b/mapValues.js
index b2af211a7..4ec082514 100644
--- a/mapValues.js
+++ b/mapValues.js
@@ -1,4 +1,5 @@
-var baseForOwn = require('./_baseForOwn'),
+var baseAssignValue = require('./_baseAssignValue'),
+    baseForOwn = require('./_baseForOwn'),
     baseIteratee = require('./_baseIteratee');
 
 /**
@@ -34,7 +35,7 @@ function mapValues(object, iteratee) {
   iteratee = baseIteratee(iteratee, 3);
 
   baseForOwn(object, function(value, key, object) {
-    result[key] = iteratee(value, key, object);
+    baseAssignValue(result, key, iteratee(value, key, object));
   });
   return result;
 }
diff --git a/memoize.js b/memoize.js
index 97aa18285..a1270355a 100644
--- a/memoize.js
+++ b/memoize.js
@@ -60,14 +60,14 @@ function memoize(func, resolver) {
       return cache.get(key);
     }
     var result = func.apply(this, args);
-    memoized.cache = cache.set(key, result);
+    memoized.cache = cache.set(key, result) || cache;
     return result;
   };
   memoized.cache = new (memoize.Cache || MapCache);
   return memoized;
 }
 
-// Assign cache to `_.memoize`.
+// Expose `MapCache`.
 memoize.Cache = MapCache;
 
 module.exports = memoize;
diff --git a/mergeWith.js b/mergeWith.js
index a621dca2f..1b43a2c4a 100644
--- a/mergeWith.js
+++ b/mergeWith.js
@@ -5,7 +5,7 @@ var baseMerge = require('./_baseMerge'),
  * This method is like `_.merge` except that it accepts `customizer` which
  * is invoked to produce the merged values of the destination and source
  * properties. If `customizer` returns `undefined`, merging is handled by the
- * method instead. The `customizer` is invoked with seven arguments:
+ * method instead. The `customizer` is invoked with six arguments:
  * (objValue, srcValue, key, object, source, stack).
  *
  * **Note:** This method mutates `object`.
diff --git a/omit.js b/omit.js
index 4ef0cafe4..38f919092 100644
--- a/omit.js
+++ b/omit.js
@@ -1,8 +1,7 @@
 var arrayMap = require('./_arrayMap'),
     baseDifference = require('./_baseDifference'),
-    baseFlatten = require('./_baseFlatten'),
     basePick = require('./_basePick'),
-    baseRest = require('./_baseRest'),
+    flatRest = require('./_flatRest'),
     getAllKeysIn = require('./_getAllKeysIn'),
     toKey = require('./_toKey');
 
@@ -25,11 +24,11 @@ var arrayMap = require('./_arrayMap'),
  * _.omit(object, ['a', 'c']);
  * // => { 'b': '2' }
  */
-var omit = baseRest(function(object, props) {
+var omit = flatRest(function(object, props) {
   if (object == null) {
     return {};
   }
-  props = arrayMap(baseFlatten(props, 1), toKey);
+  props = arrayMap(props, toKey);
   return basePick(object, baseDifference(getAllKeysIn(object), props));
 });
 
diff --git a/overArgs.js b/overArgs.js
index 56d253bc6..f0067dbd3 100644
--- a/overArgs.js
+++ b/overArgs.js
@@ -4,6 +4,7 @@ var apply = require('./_apply'),
     baseIteratee = require('./_baseIteratee'),
     baseRest = require('./_baseRest'),
     baseUnary = require('./_baseUnary'),
+    castRest = require('./_castRest'),
     isArray = require('./isArray');
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
@@ -40,7 +41,7 @@ var nativeMin = Math.min;
  * func(10, 5);
  * // => [100, 10]
  */
-var overArgs = baseRest(function(func, transforms) {
+var overArgs = castRest(function(func, transforms) {
   transforms = (transforms.length == 1 && isArray(transforms[0]))
     ? arrayMap(transforms[0], baseUnary(baseIteratee))
     : arrayMap(baseFlatten(transforms, 1), baseUnary(baseIteratee));
diff --git a/package.json b/package.json
index 5e4d36d9d..f88e332db 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash",
-  "version": "4.15.0",
+  "version": "4.16.0",
   "description": "Lodash modular utilities.",
   "keywords": "modules, stdlib, util",
   "homepage": "https://lodash.com/",
diff --git a/parseInt.js b/parseInt.js
index fe140f61b..578875870 100644
--- a/parseInt.js
+++ b/parseInt.js
@@ -1,12 +1,6 @@
 var root = require('./_root'),
     toString = require('./toString');
 
-/** Used to match leading and trailing whitespace. */
-var reTrim = /^\s+|\s+$/g;
-
-/** Used to detect hexadecimal string values. */
-var reHasHexPrefix = /^0x/i;
-
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeParseInt = root.parseInt;
 
@@ -35,15 +29,12 @@ var nativeParseInt = root.parseInt;
  * // => [6, 8, 10]
  */
 function parseInt(string, radix, guard) {
-  // Chrome fails to trim leading <BOM> whitespace characters.
-  // See https://bugs.chromium.org/p/v8/issues/detail?id=3109 for more details.
   if (guard || radix == null) {
     radix = 0;
   } else if (radix) {
     radix = +radix;
   }
-  string = toString(string).replace(reTrim, '');
-  return nativeParseInt(string, radix || (reHasHexPrefix.test(string) ? 16 : 10));
+  return nativeParseInt(toString(string), radix || 0);
 }
 
 module.exports = parseInt;
diff --git a/pick.js b/pick.js
index 464dd9f92..a631b1519 100644
--- a/pick.js
+++ b/pick.js
@@ -1,7 +1,6 @@
 var arrayMap = require('./_arrayMap'),
-    baseFlatten = require('./_baseFlatten'),
     basePick = require('./_basePick'),
-    baseRest = require('./_baseRest'),
+    flatRest = require('./_flatRest'),
     toKey = require('./_toKey');
 
 /**
@@ -21,8 +20,8 @@ var arrayMap = require('./_arrayMap'),
  * _.pick(object, ['a', 'c']);
  * // => { 'a': 1, 'c': 3 }
  */
-var pick = baseRest(function(object, props) {
-  return object == null ? {} : basePick(object, arrayMap(baseFlatten(props, 1), toKey));
+var pick = flatRest(function(object, props) {
+  return object == null ? {} : basePick(object, arrayMap(props, toKey));
 });
 
 module.exports = pick;
diff --git a/pullAt.js b/pullAt.js
index 59b5fa35a..7e4e46d7b 100644
--- a/pullAt.js
+++ b/pullAt.js
@@ -1,9 +1,8 @@
 var arrayMap = require('./_arrayMap'),
     baseAt = require('./_baseAt'),
-    baseFlatten = require('./_baseFlatten'),
     basePullAt = require('./_basePullAt'),
-    baseRest = require('./_baseRest'),
     compareAscending = require('./_compareAscending'),
+    flatRest = require('./_flatRest'),
     isIndex = require('./_isIndex');
 
 /**
@@ -30,9 +29,7 @@ var arrayMap = require('./_arrayMap'),
  * console.log(pulled);
  * // => ['b', 'd']
  */
-var pullAt = baseRest(function(array, indexes) {
-  indexes = baseFlatten(indexes, 1);
-
+var pullAt = flatRest(function(array, indexes) {
   var length = array ? array.length : 0,
       result = baseAt(array, indexes);
 
diff --git a/rearg.js b/rearg.js
index fabe5a383..4df6989b3 100644
--- a/rearg.js
+++ b/rearg.js
@@ -1,6 +1,5 @@
-var baseFlatten = require('./_baseFlatten'),
-    baseRest = require('./_baseRest'),
-    createWrap = require('./_createWrap');
+var createWrap = require('./_createWrap'),
+    flatRest = require('./_flatRest');
 
 /** Used to compose bitmasks for function metadata. */
 var REARG_FLAG = 256;
@@ -27,8 +26,8 @@ var REARG_FLAG = 256;
  * rearged('b', 'c', 'a')
  * // => ['a', 'b', 'c']
  */
-var rearg = baseRest(function(func, indexes) {
-  return createWrap(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes, 1));
+var rearg = flatRest(function(func, indexes) {
+  return createWrap(func, REARG_FLAG, undefined, undefined, undefined, indexes);
 });
 
 module.exports = rearg;
diff --git a/sample.js b/sample.js
index aff8e77d0..4ad05824a 100644
--- a/sample.js
+++ b/sample.js
@@ -1,4 +1,4 @@
-var baseRandom = require('./_baseRandom'),
+var arraySample = require('./_arraySample'),
     isArrayLike = require('./isArrayLike'),
     values = require('./values');
 
@@ -17,10 +17,7 @@ var baseRandom = require('./_baseRandom'),
  * // => 2
  */
 function sample(collection) {
-  var array = isArrayLike(collection) ? collection : values(collection),
-      length = array.length;
-
-  return length > 0 ? array[baseRandom(0, length - 1)] : undefined;
+  return arraySample(isArrayLike(collection) ? collection : values(collection));
 }
 
 module.exports = sample;
diff --git a/sampleSize.js b/sampleSize.js
index 29df2e6f2..782b97e63 100644
--- a/sampleSize.js
+++ b/sampleSize.js
@@ -1,8 +1,8 @@
-var baseClamp = require('./_baseClamp'),
-    baseRandom = require('./_baseRandom'),
+var arraySampleSize = require('./_arraySampleSize'),
+    isArrayLike = require('./isArrayLike'),
     isIterateeCall = require('./_isIterateeCall'),
-    toArray = require('./toArray'),
-    toInteger = require('./toInteger');
+    toInteger = require('./toInteger'),
+    values = require('./values');
 
 /**
  * Gets `n` random elements at unique keys from `collection` up to the
@@ -25,25 +25,12 @@ var baseClamp = require('./_baseClamp'),
  * // => [2, 3, 1]
  */
 function sampleSize(collection, n, guard) {
-  var index = -1,
-      result = toArray(collection),
-      length = result.length,
-      lastIndex = length - 1;
-
   if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
     n = 1;
   } else {
-    n = baseClamp(toInteger(n), 0, length);
+    n = toInteger(n);
   }
-  while (++index < n) {
-    var rand = baseRandom(index, lastIndex),
-        value = result[rand];
-
-    result[rand] = result[index];
-    result[index] = value;
-  }
-  result.length = n;
-  return result;
+  return arraySampleSize(isArrayLike(collection) ? collection : values(collection), n);
 }
 
 module.exports = sampleSize;
diff --git a/shuffle.js b/shuffle.js
index 88d00cefe..dca8c2fdb 100644
--- a/shuffle.js
+++ b/shuffle.js
@@ -1,7 +1,7 @@
-var sampleSize = require('./sampleSize');
-
-/** Used as references for the maximum length and index of an array. */
-var MAX_ARRAY_LENGTH = 4294967295;
+var copyArray = require('./_copyArray'),
+    isArrayLike = require('./isArrayLike'),
+    shuffleSelf = require('./_shuffleSelf'),
+    values = require('./values');
 
 /**
  * Creates an array of shuffled values, using a version of the
@@ -19,7 +19,10 @@ var MAX_ARRAY_LENGTH = 4294967295;
  * // => [4, 1, 3, 2]
  */
 function shuffle(collection) {
-  return sampleSize(collection, MAX_ARRAY_LENGTH);
+  return shuffleSelf(isArrayLike(collection)
+    ? copyArray(collection)
+    : values(collection)
+  );
 }
 
 module.exports = shuffle;
diff --git a/sortBy.js b/sortBy.js
index 5fbee44c7..4ba8f7a0e 100644
--- a/sortBy.js
+++ b/sortBy.js
@@ -26,16 +26,11 @@ var baseFlatten = require('./_baseFlatten'),
  *   { 'user': 'barney', 'age': 34 }
  * ];
  *
- * _.sortBy(users, function(o) { return o.user; });
+ * _.sortBy(users, [function(o) { return o.user; }]);
  * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
  *
  * _.sortBy(users, ['user', 'age']);
  * // => objects for [['barney', 34], ['barney', 36], ['fred', 40], ['fred', 48]]
- *
- * _.sortBy(users, 'user', function(o) {
- *   return Math.floor(o.age / 10);
- * });
- * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
  */
 var sortBy = baseRest(function(collection, iteratees) {
   if (collection == null) {
diff --git a/template.js b/template.js
index c1a523c57..2df417fa7 100644
--- a/template.js
+++ b/template.js
@@ -86,7 +86,8 @@ var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
  * compiled({ 'user': 'barney' });
  * // => 'hello barney!'
  *
- * // Use the ES delimiter as an alternative to the default "interpolate" delimiter.
+ * // Use the ES template literal delimiter as an "interpolate" delimiter.
+ * // Disable support by replacing the "interpolate" delimiter.
  * var compiled = _.template('hello ${ user }!');
  * compiled({ 'user': 'pebbles' });
  * // => 'hello pebbles!'
diff --git a/unescape.js b/unescape.js
index 929bb1675..df011bd3d 100644
--- a/unescape.js
+++ b/unescape.js
@@ -7,7 +7,7 @@ var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g,
 
 /**
  * The inverse of `_.escape`; this method converts the HTML entities
- * `&amp;`, `&lt;`, `&gt;`, `&quot;`, `&#39;`, and `&#96;` in `string` to
+ * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
  * their corresponding characters.
  *
  * **Note:** No other HTML entities are unescaped. To unescape additional
diff --git a/uniq.js b/uniq.js
index 52e5d512a..1df782630 100644
--- a/uniq.js
+++ b/uniq.js
@@ -3,8 +3,9 @@ var baseUniq = require('./_baseUniq');
 /**
  * Creates a duplicate-free version of an array, using
  * [`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.
+ * for equality comparisons, in which only the first occurrence of each element
+ * is kept. The order of result values is determined by the order they occur
+ * in the array.
  *
  * @static
  * @memberOf _
diff --git a/uniqBy.js b/uniqBy.js
index d67d4f161..621ab3e5c 100644
--- a/uniqBy.js
+++ b/uniqBy.js
@@ -4,7 +4,9 @@ var baseIteratee = require('./_baseIteratee'),
 /**
  * This method is like `_.uniq` except that it accepts `iteratee` which is
  * invoked for each element in `array` to generate the criterion by which
- * uniqueness is computed. The iteratee is invoked with one argument: (value).
+ * uniqueness is computed. The order of result values is determined by the
+ * order they occur in the array. The iteratee is invoked with one argument:
+ * (value).
  *
  * @static
  * @memberOf _
diff --git a/uniqWith.js b/uniqWith.js
index e09b1729e..86af583ad 100644
--- a/uniqWith.js
+++ b/uniqWith.js
@@ -2,8 +2,9 @@ var baseUniq = require('./_baseUniq');
 
 /**
  * This method is like `_.uniq` except that it accepts `comparator` which
- * is invoked to compare elements of `array`. The comparator is invoked with
- * two arguments: (arrVal, othVal).
+ * is invoked to compare elements of `array`. The order of result values is
+ * determined by the order they occur in the array.The comparator is invoked
+ * with two arguments: (arrVal, othVal).
  *
  * @static
  * @memberOf _
diff --git a/wrapperAt.js b/wrapperAt.js
index 829851125..ab3d22af9 100644
--- a/wrapperAt.js
+++ b/wrapperAt.js
@@ -1,8 +1,7 @@
 var LazyWrapper = require('./_LazyWrapper'),
     LodashWrapper = require('./_LodashWrapper'),
     baseAt = require('./_baseAt'),
-    baseFlatten = require('./_baseFlatten'),
-    baseRest = require('./_baseRest'),
+    flatRest = require('./_flatRest'),
     isIndex = require('./_isIndex'),
     thru = require('./thru');
 
@@ -22,8 +21,7 @@ var LazyWrapper = require('./_LazyWrapper'),
  * _(object).at(['a[0].b.c', 'a[1]']).value();
  * // => [3, 4]
  */
-var wrapperAt = baseRest(function(paths) {
-  paths = baseFlatten(paths, 1);
+var wrapperAt = flatRest(function(paths) {
   var length = paths.length,
       start = length ? paths[0] : 0,
       value = this.__wrapped__,
diff --git a/xorBy.js b/xorBy.js
index 00b03108b..2cb524222 100644
--- a/xorBy.js
+++ b/xorBy.js
@@ -8,8 +8,9 @@ var arrayFilter = require('./_arrayFilter'),
 /**
  * This method is like `_.xor` except that it accepts `iteratee` which is
  * invoked for each element of each `arrays` to generate the criterion by
- * which by which they're compared. The iteratee is invoked with one argument:
- * (value).
+ * which by which they're compared. The order of result values is determined
+ * by the order they occur in the arrays. The iteratee is invoked with one
+ * argument: (value).
  *
  * @static
  * @memberOf _
diff --git a/xorWith.js b/xorWith.js
index 4bd9071d9..68460dbd7 100644
--- a/xorWith.js
+++ b/xorWith.js
@@ -6,8 +6,9 @@ var arrayFilter = require('./_arrayFilter'),
 
 /**
  * This method is like `_.xor` except that it accepts `comparator` which is
- * invoked to compare elements of `arrays`. The comparator is invoked with
- * two arguments: (arrVal, othVal).
+ * invoked to compare elements of `arrays`. The order of result values is
+ * determined by the order they occur in the arrays. The comparator is invoked
+ * with two arguments: (arrVal, othVal).
  *
  * @static
  * @memberOf _