diff --git a/README.md b/README.md
index 871071331..33a7ef26e 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash v4.2.1
+# lodash v4.3.0
 
 The [lodash](https://lodash.com/) library exported as [Node.js](https://nodejs.org/) modules.
 
@@ -28,7 +28,7 @@ var chunk = require('lodash/chunk');
 var extend = require('lodash/fp/extend');
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.2.1-npm) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.3.0-npm) for more details.
 
 **Note:**<br>
 Don’t assign values to the [special variable](http://nodejs.org/api/repl.html#repl_repl_features) `_` when in the REPL.<br>
diff --git a/_baseClone.js b/_baseClone.js
index d57870f92..42d90a95c 100644
--- a/_baseClone.js
+++ b/_baseClone.js
@@ -3,6 +3,7 @@ var Stack = require('./_Stack'),
     assignValue = require('./_assignValue'),
     baseAssign = require('./_baseAssign'),
     baseForOwn = require('./_baseForOwn'),
+    cloneBuffer = require('./_cloneBuffer'),
     copyArray = require('./_copyArray'),
     copySymbols = require('./_copySymbols'),
     getTag = require('./_getTag'),
@@ -10,6 +11,7 @@ var Stack = require('./_Stack'),
     initCloneByTag = require('./_initCloneByTag'),
     initCloneObject = require('./_initCloneObject'),
     isArray = require('./isArray'),
+    isBuffer = require('./isBuffer'),
     isHostObject = require('./_isHostObject'),
     isObject = require('./isObject');
 
@@ -91,6 +93,9 @@ function baseClone(value, isDeep, customizer, key, object, stack) {
     var tag = getTag(value),
         isFunc = tag == funcTag || tag == genTag;
 
+    if (isBuffer(value)) {
+      return cloneBuffer(value, isDeep);
+    }
     if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
       if (isHostObject(value)) {
         return object ? value : {};
diff --git a/_baseDelay.js b/_baseDelay.js
index edd83565b..c39756257 100644
--- a/_baseDelay.js
+++ b/_baseDelay.js
@@ -8,7 +8,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  * @private
  * @param {Function} func The function to delay.
  * @param {number} wait The number of milliseconds to delay invocation.
- * @param {Object} args The arguments provide to `func`.
+ * @param {Object} args The arguments to provide to `func`.
  * @returns {number} Returns the timer id.
  */
 function baseDelay(func, wait, args) {
diff --git a/_baseFunctions.js b/_baseFunctions.js
index b3dc8f9c9..6e1090f9c 100644
--- a/_baseFunctions.js
+++ b/_baseFunctions.js
@@ -3,7 +3,7 @@ var arrayFilter = require('./_arrayFilter'),
 
 /**
  * The base implementation of `_.functions` which creates an array of
- * `object` function property names filtered from those provided.
+ * `object` function property names filtered from `props`.
  *
  * @private
  * @param {Object} object The object to inspect.
diff --git a/_cloneArrayBuffer.js b/_cloneArrayBuffer.js
new file mode 100644
index 000000000..a7ed50cdd
--- /dev/null
+++ b/_cloneArrayBuffer.js
@@ -0,0 +1,19 @@
+var Uint8Array = require('./_Uint8Array');
+
+/**
+ * Creates a clone of `arrayBuffer`.
+ *
+ * @private
+ * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
+ * @returns {ArrayBuffer} Returns the cloned array buffer.
+ */
+function cloneArrayBuffer(arrayBuffer) {
+  var Ctor = arrayBuffer.constructor,
+      result = new Ctor(arrayBuffer.byteLength),
+      view = new Uint8Array(result);
+
+  view.set(new Uint8Array(arrayBuffer));
+  return result;
+}
+
+module.exports = cloneArrayBuffer;
diff --git a/_cloneBuffer.js b/_cloneBuffer.js
index defdb151c..58a4e2bdd 100644
--- a/_cloneBuffer.js
+++ b/_cloneBuffer.js
@@ -1,18 +1,19 @@
-var Uint8Array = require('./_Uint8Array');
-
 /**
- * Creates a clone of `buffer`.
+ * Creates a clone of  `buffer`.
  *
  * @private
- * @param {ArrayBuffer} buffer The array buffer to clone.
- * @returns {ArrayBuffer} Returns the cloned array buffer.
+ * @param {Buffer} buffer The buffer to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Buffer} Returns the cloned buffer.
  */
-function cloneBuffer(buffer) {
+function cloneBuffer(buffer, isDeep) {
+  if (isDeep) {
+    return buffer.slice();
+  }
   var Ctor = buffer.constructor,
-      result = new Ctor(buffer.byteLength),
-      view = new Uint8Array(result);
+      result = new Ctor(buffer.length);
 
-  view.set(new Uint8Array(buffer));
+  buffer.copy(result);
   return result;
 }
 
diff --git a/_cloneTypedArray.js b/_cloneTypedArray.js
index b17467de2..8a2d0f7e6 100644
--- a/_cloneTypedArray.js
+++ b/_cloneTypedArray.js
@@ -1,4 +1,4 @@
-var cloneBuffer = require('./_cloneBuffer');
+var cloneArrayBuffer = require('./_cloneArrayBuffer');
 
 /**
  * Creates a clone of `typedArray`.
@@ -12,7 +12,7 @@ function cloneTypedArray(typedArray, isDeep) {
   var buffer = typedArray.buffer,
       Ctor = typedArray.constructor;
 
-  return new Ctor(isDeep ? cloneBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
+  return new Ctor(isDeep ? cloneArrayBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
 }
 
 module.exports = cloneTypedArray;
diff --git a/_getTag.js b/_getTag.js
index ceacc4fa1..1516eca39 100644
--- a/_getTag.js
+++ b/_getTag.js
@@ -1,10 +1,12 @@
 var Map = require('./_Map'),
-    Set = require('./_Set');
+    Set = require('./_Set'),
+    WeakMap = require('./_WeakMap');
 
 /** `Object#toString` result references. */
 var mapTag = '[object Map]',
     objectTag = '[object Object]',
-    setTag = '[object Set]';
+    setTag = '[object Set]',
+    weakMapTag = '[object WeakMap]';
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
@@ -18,9 +20,10 @@ var funcToString = Function.prototype.toString;
  */
 var objectToString = objectProto.toString;
 
-/** Used to detect maps and sets. */
+/** Used to detect maps, sets, and weakmaps. */
 var mapCtorString = Map ? funcToString.call(Map) : '',
-    setCtorString = Set ? funcToString.call(Set) : '';
+    setCtorString = Set ? funcToString.call(Set) : '',
+    weakMapCtorString = WeakMap ? funcToString.call(WeakMap) : '';
 
 /**
  * Gets the `toStringTag` of `value`.
@@ -33,19 +36,20 @@ function getTag(value) {
   return objectToString.call(value);
 }
 
-// Fallback for IE 11 providing `toStringTag` values for maps and sets.
-if ((Map && getTag(new Map) != mapTag) || (Set && getTag(new Set) != setTag)) {
+// Fallback for IE 11 providing `toStringTag` values for maps, sets, and weakmaps.
+if ((Map && getTag(new Map) != mapTag) ||
+    (Set && getTag(new Set) != setTag) ||
+    (WeakMap && getTag(new WeakMap) != weakMapTag)) {
   getTag = function(value) {
     var result = objectToString.call(value),
         Ctor = result == objectTag ? value.constructor : null,
         ctorString = typeof Ctor == 'function' ? funcToString.call(Ctor) : '';
 
     if (ctorString) {
-      if (ctorString == mapCtorString) {
-        return mapTag;
-      }
-      if (ctorString == setCtorString) {
-        return setTag;
+      switch (ctorString) {
+        case mapCtorString: return mapTag;
+        case setCtorString: return setTag;
+        case weakMapCtorString: return weakMapTag;
       }
     }
     return result;
diff --git a/_initCloneByTag.js b/_initCloneByTag.js
index c326ba908..5d21cda7f 100644
--- a/_initCloneByTag.js
+++ b/_initCloneByTag.js
@@ -1,4 +1,4 @@
-var cloneBuffer = require('./_cloneBuffer'),
+var cloneArrayBuffer = require('./_cloneArrayBuffer'),
     cloneMap = require('./_cloneMap'),
     cloneRegExp = require('./_cloneRegExp'),
     cloneSet = require('./_cloneSet'),
@@ -42,7 +42,7 @@ function initCloneByTag(object, tag, isDeep) {
   var Ctor = object.constructor;
   switch (tag) {
     case arrayBufferTag:
-      return cloneBuffer(object);
+      return cloneArrayBuffer(object);
 
     case boolTag:
     case dateTag:
diff --git a/_isIterateeCall.js b/_isIterateeCall.js
index 34afa3ea8..b422b4869 100644
--- a/_isIterateeCall.js
+++ b/_isIterateeCall.js
@@ -4,7 +4,7 @@ var eq = require('./eq'),
     isObject = require('./isObject');
 
 /**
- * Checks if the provided arguments are from an iteratee call.
+ * Checks if the given arguments are from an iteratee call.
  *
  * @private
  * @param {*} value The potential iteratee value argument.
diff --git a/add.js b/add.js
index 3be02f08c..d09785022 100644
--- a/add.js
+++ b/add.js
@@ -14,6 +14,9 @@
  */
 function add(augend, addend) {
   var result;
+  if (augend === undefined && addend === undefined) {
+    return 0;
+  }
   if (augend !== undefined) {
     result = augend;
   }
diff --git a/bind.js b/bind.js
index 2a50568fb..bd89d1f03 100644
--- a/bind.js
+++ b/bind.js
@@ -52,4 +52,7 @@ var bind = rest(function(func, thisArg, partials) {
   return createWrapper(func, bitmask, thisArg, partials, holders);
 });
 
+// Assign default placeholders.
+bind.placeholder = {};
+
 module.exports = bind;
diff --git a/bindKey.js b/bindKey.js
index ba8e1cb29..5cefad3ed 100644
--- a/bindKey.js
+++ b/bindKey.js
@@ -62,4 +62,7 @@ var bindKey = rest(function(object, key, partials) {
   return createWrapper(key, bitmask, object, partials, holders);
 });
 
+// Assign default placeholders.
+bindKey.placeholder = {};
+
 module.exports = bindKey;
diff --git a/core.js b/core.js
index 120fdd867..ee2a004e7 100644
--- a/core.js
+++ b/core.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.2.1 (Custom Build) <https://lodash.com/>
+ * lodash 4.3.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash core -o ./dist/lodash.core.js`
  * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -13,7 +13,7 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.2.1';
+  var VERSION = '4.3.0';
 
   /** Used to compose bitmasks for wrapper metadata. */
   var BIND_FLAG = 1,
@@ -576,7 +576,7 @@
    * @private
    * @param {Function} func The function to delay.
    * @param {number} wait The number of milliseconds to delay invocation.
-   * @param {Object} args The arguments provide to `func`.
+   * @param {Object} args The arguments to provide to `func`.
    * @returns {number} Returns the timer id.
    */
   function baseDelay(func, wait, args) {
@@ -692,7 +692,7 @@
 
   /**
    * The base implementation of `_.functions` which creates an array of
-   * `object` function property names filtered from those provided.
+   * `object` function property names filtered from `props`.
    *
    * @private
    * @param {Object} object The object to inspect.
@@ -1924,7 +1924,7 @@
    * Reduces `collection` to a value which is the accumulated result of running
    * each element in `collection` through `iteratee`, where each successive
    * invocation is supplied the return value of the previous. If `accumulator`
-   * is not provided the first element of `collection` is used as the initial
+   * is not given the first element of `collection` is used as the initial
    * value. The iteratee is invoked with four arguments:
    * (accumulator, value, index|key, collection).
    *
@@ -3099,7 +3099,7 @@
 
   /**
    * Creates an object that inherits from the `prototype` object. If a `properties`
-   * object is provided its own enumerable properties are assigned to the created object.
+   * object is given its own enumerable properties are assigned to the created object.
    *
    * @static
    * @memberOf _
@@ -3407,7 +3407,7 @@
   /*------------------------------------------------------------------------*/
 
   /**
-   * This method returns the first argument provided to it.
+   * This method returns the first argument given to it.
    *
    * @static
    * @memberOf _
@@ -3592,7 +3592,7 @@
   }
 
   /**
-   * Generates a unique ID. If `prefix` is provided the ID is appended to it.
+   * Generates a unique ID. If `prefix` is given the ID is appended to it.
    *
    * @static
    * @memberOf _
diff --git a/create.js b/create.js
index 196512358..dddbd29f7 100644
--- a/create.js
+++ b/create.js
@@ -3,7 +3,7 @@ var baseAssign = require('./_baseAssign'),
 
 /**
  * Creates an object that inherits from the `prototype` object. If a `properties`
- * object is provided its own enumerable properties are assigned to the created object.
+ * object is given its own enumerable properties are assigned to the created object.
  *
  * @static
  * @memberOf _
diff --git a/curry.js b/curry.js
index 13874ce00..1c5e8a5fb 100644
--- a/curry.js
+++ b/curry.js
@@ -50,4 +50,7 @@ function curry(func, arity, guard) {
   return result;
 }
 
+// Assign default placeholders.
+curry.placeholder = {};
+
 module.exports = curry;
diff --git a/curryRight.js b/curryRight.js
index f809955b3..8521fdc4f 100644
--- a/curryRight.js
+++ b/curryRight.js
@@ -47,4 +47,7 @@ function curryRight(func, arity, guard) {
   return result;
 }
 
+// Assign default placeholders.
+curryRight.placeholder = {};
+
 module.exports = curryRight;
diff --git a/debounce.js b/debounce.js
index fadf716ab..fd735e933 100644
--- a/debounce.js
+++ b/debounce.js
@@ -135,7 +135,7 @@ function debounce(func, wait, options) {
     if (maxWait === false) {
       var leadingCall = leading && !timeoutId;
     } else {
-      if (!maxTimeoutId && !leading) {
+      if (!lastCalled && !maxTimeoutId && !leading) {
         lastCalled = stamp;
       }
       var remaining = maxWait - (stamp - lastCalled),
diff --git a/difference.js b/difference.js
index a1495b357..5036d8ef7 100644
--- a/difference.js
+++ b/difference.js
@@ -5,7 +5,7 @@ var baseDifference = require('./_baseDifference'),
 
 /**
  * Creates an array of unique `array` values not included in the other
- * provided arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * given arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
  * for equality comparisons.
  *
  * @static
diff --git a/flow.js b/flow.js
index a69e914c2..b773405f6 100644
--- a/flow.js
+++ b/flow.js
@@ -1,9 +1,9 @@
 var createFlow = require('./_createFlow');
 
 /**
- * Creates a function that returns the result of invoking the provided
- * functions with the `this` binding of the created function, where each
- * successive invocation is supplied the return value of the previous.
+ * Creates a function that returns the result of invoking the given functions
+ * with the `this` binding of the created function, where each successive
+ * invocation is supplied the return value of the previous.
  *
  * @static
  * @memberOf _
diff --git a/flowRight.js b/flowRight.js
index 4164a8b98..e844822bd 100644
--- a/flowRight.js
+++ b/flowRight.js
@@ -2,7 +2,7 @@ var createFlow = require('./_createFlow');
 
 /**
  * This method is like `_.flow` except that it creates a function that
- * invokes the provided functions from right to left.
+ * invokes the given functions from right to left.
  *
  * @static
  * @memberOf _
diff --git a/fp/_baseConvert.js b/fp/_baseConvert.js
index 2af63a7f0..76cc02ce8 100644
--- a/fp/_baseConvert.js
+++ b/fp/_baseConvert.js
@@ -9,9 +9,17 @@ var mapping = require('./_mapping'),
  * @param {Object} util The util object.
  * @param {string} name The name of the function to wrap.
  * @param {Function} func The function to wrap.
+ * @param {Object} [options] The options object.
+ * @param {boolean} [options.cap=true] Specify capping iteratee arguments.
+ * @param {boolean} [options.curry=true] Specify currying.
+ * @param {boolean} [options.fixed=true] Specify fixed arity.
+ * @param {boolean} [options.immutable=true] Specify immutable operations.
+ * @param {boolean} [options.rearg=true] Specify rearranging arguments.
  * @returns {Function|Object} Returns the converted function or object.
  */
-function baseConvert(util, name, func) {
+function baseConvert(util, name, func, options) {
+  options || (options = {});
+
   if (typeof func != 'function') {
     func = name;
     name = undefined;
@@ -19,6 +27,16 @@ function baseConvert(util, name, func) {
   if (func == null) {
     throw new TypeError;
   }
+  var config = {
+    'cap': 'cap' in options ? options.cap : true,
+    'curry': 'curry' in options ? options.curry : true,
+    'fixed': 'fixed' in options ? options.fixed : true,
+    'immutable': 'immutable' in options ? options.immutable : true,
+    'rearg': 'rearg' in options ? options.rearg : true
+  };
+
+  var forceRearg = ('rearg' in options) && options.rearg;
+
   var isLib = name === undefined && typeof func.VERSION == 'string';
 
   var _ = isLib ? func : {
@@ -107,6 +125,9 @@ function baseConvert(util, name, func) {
         var func = arguments[0],
             arity = arguments[1];
 
+        if (!config.cap) {
+          return iteratee(func, arity);
+        }
         arity = arity > 2 ? (arity - 2) : 1;
         func = iteratee(func);
         var length = func.length;
@@ -145,7 +166,7 @@ function baseConvert(util, name, func) {
     },
     'runInContext': function(runInContext) {
       return function(context) {
-        return baseConvert(util, runInContext(context));
+        return baseConvert(util, runInContext(context), undefined, options);
       };
     }
   };
@@ -157,14 +178,16 @@ function baseConvert(util, name, func) {
       return wrapper(func);
     }
     var wrapped = func;
-    if (mutateMap.array[name]) {
-      wrapped = immutWrap(func, cloneArray);
-    }
-    else if (mutateMap.object[name]) {
-      wrapped = immutWrap(func, createCloner(func));
-    }
-    else if (mutateMap.set[name]) {
-      wrapped = immutWrap(func, cloneDeep);
+    if (config.immutable) {
+      if (mutateMap.array[name]) {
+        wrapped = immutWrap(func, cloneArray);
+      }
+      else if (mutateMap.object[name]) {
+        wrapped = immutWrap(func, createCloner(func));
+      }
+      else if (mutateMap.set[name]) {
+        wrapped = immutWrap(func, cloneDeep);
+      }
     }
     var result;
     each(mapping.caps, function(cap) {
@@ -174,19 +197,22 @@ function baseConvert(util, name, func) {
               reargIndexes = mapping.iterateeRearg[name],
               spreadStart = mapping.methodSpread[name];
 
-          result = spreadStart === undefined
-            ? ary(wrapped, cap)
-            : spread(wrapped, spreadStart);
-
-          if (cap > 1 && !mapping.skipRearg[name]) {
+          if (config.fixed) {
+            result = spreadStart === undefined
+              ? ary(wrapped, cap)
+              : spread(wrapped, spreadStart);
+          }
+          if (config.rearg && cap > 1 && (forceRearg || !mapping.skipRearg[name])) {
             result = rearg(result, mapping.methodRearg[name] || mapping.aryRearg[cap]);
           }
-          if (reargIndexes) {
-            result = iterateeRearg(result, reargIndexes);
-          } else if (aryN) {
-            result = iterateeAry(result, aryN);
+          if (config.cap) {
+            if (reargIndexes) {
+              result = iterateeRearg(result, reargIndexes);
+            } else if (aryN) {
+              result = iterateeAry(result, aryN);
+            }
           }
-          if (cap > 1) {
+          if (config.curry && cap > 1) {
             result = curry(result, cap);
           }
           return false;
diff --git a/fp/_convertBrowser.js b/fp/_convertBrowser.js
index b076778a4..0e69e66cd 100644
--- a/fp/_convertBrowser.js
+++ b/fp/_convertBrowser.js
@@ -4,10 +4,11 @@ var baseConvert = require('./_baseConvert');
  * Converts `lodash` to an immutable auto-curried iteratee-first data-last version.
  *
  * @param {Function} lodash The lodash function.
+ * @param {Object} [options] The options object. See `baseConvert` for more details.
  * @returns {Function} Returns the converted `lodash`.
  */
-function browserConvert(lodash) {
-  return baseConvert(lodash, lodash);
+function browserConvert(lodash, options) {
+  return baseConvert(lodash, lodash, undefined, options);
 }
 
 module.exports = browserConvert;
diff --git a/fp/_mapping.js b/fp/_mapping.js
index 8b8e24b75..75f0babaa 100644
--- a/fp/_mapping.js
+++ b/fp/_mapping.js
@@ -226,6 +226,10 @@ exports.skipRearg = {
   'assignIn': true,
   'concat': true,
   'difference': true,
+  'gt': true,
+  'gte': true,
+  'lt': true,
+  'lte': true,
   'matchesProperty': true,
   'merge': true,
   'partial': true,
diff --git a/fp/convert.js b/fp/convert.js
index 85f3b7535..a1d266fa6 100644
--- a/fp/convert.js
+++ b/fp/convert.js
@@ -7,10 +7,11 @@ var baseConvert = require('./_baseConvert'),
  *
  * @param {string} name The name of the function to wrap.
  * @param {Function} [func] The function to wrap.
+ * @param {Object} [options] The options object. See `baseConvert` for more details.
  * @returns {Function|Object} Returns the converted function or object.
  */
-function convert(name, func) {
-  return baseConvert(util, name, func);
+function convert(name, func, options) {
+  return baseConvert(util, name, func, options);
 }
 
 module.exports = convert;
diff --git a/fp/isArrayBuffer.js b/fp/isArrayBuffer.js
new file mode 100644
index 000000000..655e85bac
--- /dev/null
+++ b/fp/isArrayBuffer.js
@@ -0,0 +1 @@
+module.exports = require('../isArrayBuffer');
diff --git a/fp/isBuffer.js b/fp/isBuffer.js
new file mode 100644
index 000000000..15af9b634
--- /dev/null
+++ b/fp/isBuffer.js
@@ -0,0 +1 @@
+module.exports = require('../isBuffer');
diff --git a/fp/isMap.js b/fp/isMap.js
new file mode 100644
index 000000000..51fb7e2e9
--- /dev/null
+++ b/fp/isMap.js
@@ -0,0 +1 @@
+module.exports = require('../isMap');
diff --git a/fp/isSet.js b/fp/isSet.js
new file mode 100644
index 000000000..f8a0a498c
--- /dev/null
+++ b/fp/isSet.js
@@ -0,0 +1 @@
+module.exports = require('../isSet');
diff --git a/fp/isWeakMap.js b/fp/isWeakMap.js
new file mode 100644
index 000000000..dc622014e
--- /dev/null
+++ b/fp/isWeakMap.js
@@ -0,0 +1 @@
+module.exports = require('../isWeakMap');
diff --git a/fp/isWeakSet.js b/fp/isWeakSet.js
new file mode 100644
index 000000000..7646ca884
--- /dev/null
+++ b/fp/isWeakSet.js
@@ -0,0 +1 @@
+module.exports = require('../isWeakSet');
diff --git a/identity.js b/identity.js
index fa30e1789..da7dea19c 100644
--- a/identity.js
+++ b/identity.js
@@ -1,5 +1,5 @@
 /**
- * This method returns the first argument provided to it.
+ * This method returns the first argument given to it.
  *
  * @static
  * @memberOf _
diff --git a/intersection.js b/intersection.js
index 8e1b8c35d..e97efddb7 100644
--- a/intersection.js
+++ b/intersection.js
@@ -4,8 +4,8 @@ var arrayMap = require('./_arrayMap'),
     toArrayLikeObject = require('./_toArrayLikeObject');
 
 /**
- * Creates an array of unique values that are included in all of the provided
- * arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * Creates an array of unique values that are included in all given arrays
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
  * for equality comparisons.
  *
  * @static
diff --git a/isArrayBuffer.js b/isArrayBuffer.js
new file mode 100644
index 000000000..80b85633f
--- /dev/null
+++ b/isArrayBuffer.js
@@ -0,0 +1,35 @@
+var isObjectLike = require('./isObjectLike');
+
+var arrayBufferTag = '[object ArrayBuffer]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * Checks if `value` is classified as an `ArrayBuffer` object.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isArrayBuffer(new ArrayBuffer(2));
+ * // => true
+ *
+ * _.isArrayBuffer(new Array(2));
+ * // => false
+ */
+function isArrayBuffer(value) {
+  return isObjectLike(value) && objectToString.call(value) == arrayBufferTag;
+}
+
+module.exports = isArrayBuffer;
diff --git a/isBuffer.js b/isBuffer.js
new file mode 100644
index 000000000..1e6b8b6d3
--- /dev/null
+++ b/isBuffer.js
@@ -0,0 +1,42 @@
+var constant = require('./constant'),
+    root = require('./_root');
+
+/** Used to determine if values are of the language type `Object`. */
+var objectTypes = {
+  'function': true,
+  'object': true
+};
+
+/** Detect free variable `exports`. */
+var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
+
+/** Detect free variable `module`. */
+var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
+
+/** Detect the popular CommonJS extension `module.exports`. */
+var moduleExports = (freeModule && freeModule.exports === freeExports) ? freeExports : null;
+
+/** Built-in value references. */
+var Buffer = moduleExports ? root.Buffer : undefined;
+
+/**
+ * Checks if `value` is a buffer.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
+ * @example
+ *
+ * _.isBuffer(new Buffer(2));
+ * // => true
+ *
+ * _.isBuffer(new Uint8Array(2));
+ * // => false
+ */
+var isBuffer = !Buffer ? constant(false) : function(value) {
+  return value instanceof Buffer;
+};
+
+module.exports = isBuffer;
diff --git a/isMap.js b/isMap.js
new file mode 100644
index 000000000..bc92defd8
--- /dev/null
+++ b/isMap.js
@@ -0,0 +1,27 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var mapTag = '[object Map]';
+
+/**
+ * Checks if `value` is classified as a `Map` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isMap(new Map);
+ * // => true
+ *
+ * _.isMap(new WeakMap);
+ * // => false
+ */
+function isMap(value) {
+  return isObjectLike(value) && getTag(value) == mapTag;
+}
+
+module.exports = isMap;
diff --git a/isSet.js b/isSet.js
new file mode 100644
index 000000000..e1d50be90
--- /dev/null
+++ b/isSet.js
@@ -0,0 +1,27 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var setTag = '[object Set]';
+
+/**
+ * Checks if `value` is classified as a `Set` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isSet(new Set);
+ * // => true
+ *
+ * _.isSet(new WeakSet);
+ * // => false
+ */
+function isSet(value) {
+  return isObjectLike(value) && getTag(value) == setTag;
+}
+
+module.exports = isSet;
diff --git a/isWeakMap.js b/isWeakMap.js
new file mode 100644
index 000000000..d934a9f5e
--- /dev/null
+++ b/isWeakMap.js
@@ -0,0 +1,27 @@
+var getTag = require('./_getTag'),
+    isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var weakMapTag = '[object WeakMap]';
+
+/**
+ * Checks if `value` is classified as a `WeakMap` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isWeakMap(new WeakMap);
+ * // => true
+ *
+ * _.isWeakMap(new Map);
+ * // => false
+ */
+function isWeakMap(value) {
+  return isObjectLike(value) && getTag(value) == weakMapTag;
+}
+
+module.exports = isWeakMap;
diff --git a/isWeakSet.js b/isWeakSet.js
new file mode 100644
index 000000000..40674f480
--- /dev/null
+++ b/isWeakSet.js
@@ -0,0 +1,35 @@
+var isObjectLike = require('./isObjectLike');
+
+/** `Object#toString` result references. */
+var weakSetTag = '[object WeakSet]';
+
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/**
+ * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * Checks if `value` is classified as a `WeakSet` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isWeakSet(new WeakSet);
+ * // => true
+ *
+ * _.isWeakSet(new Set);
+ * // => false
+ */
+function isWeakSet(value) {
+  return isObjectLike(value) && objectToString.call(value) == weakSetTag;
+}
+
+module.exports = isWeakSet;
diff --git a/lang.js b/lang.js
index f42b140fc..d3be68f06 100644
--- a/lang.js
+++ b/lang.js
@@ -8,9 +8,11 @@ module.exports = {
   'gte': require('./gte'),
   'isArguments': require('./isArguments'),
   'isArray': require('./isArray'),
+  'isArrayBuffer': require('./isArrayBuffer'),
   'isArrayLike': require('./isArrayLike'),
   'isArrayLikeObject': require('./isArrayLikeObject'),
   'isBoolean': require('./isBoolean'),
+  'isBuffer': require('./isBuffer'),
   'isDate': require('./isDate'),
   'isElement': require('./isElement'),
   'isEmpty': require('./isEmpty'),
@@ -21,6 +23,7 @@ module.exports = {
   'isFunction': require('./isFunction'),
   'isInteger': require('./isInteger'),
   'isLength': require('./isLength'),
+  'isMap': require('./isMap'),
   'isMatch': require('./isMatch'),
   'isMatchWith': require('./isMatchWith'),
   'isNaN': require('./isNaN'),
@@ -33,10 +36,13 @@ module.exports = {
   'isPlainObject': require('./isPlainObject'),
   'isRegExp': require('./isRegExp'),
   'isSafeInteger': require('./isSafeInteger'),
+  'isSet': require('./isSet'),
   'isString': require('./isString'),
   'isSymbol': require('./isSymbol'),
   'isTypedArray': require('./isTypedArray'),
   'isUndefined': require('./isUndefined'),
+  'isWeakMap': require('./isWeakMap'),
+  'isWeakSet': require('./isWeakSet'),
   'lt': require('./lt'),
   'lte': require('./lte'),
   'toArray': require('./toArray'),
diff --git a/lodash.js b/lodash.js
index 97f4b4afe..d314acd09 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.2.1 (Custom Build) <https://lodash.com/>
+ * lodash 4.3.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash -d -o ./foo/lodash.js`
  * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -13,7 +13,7 @@
   var undefined;
 
   /** Used as the semantic version number. */
-  var VERSION = '4.2.1';
+  var VERSION = '4.3.0';
 
   /** Used to compose bitmasks for wrapper metadata. */
   var BIND_FLAG = 1,
@@ -82,7 +82,8 @@
       setTag = '[object Set]',
       stringTag = '[object String]',
       symbolTag = '[object Symbol]',
-      weakMapTag = '[object WeakMap]';
+      weakMapTag = '[object WeakMap]',
+      weakSetTag = '[object WeakSet]';
 
   var arrayBufferTag = '[object ArrayBuffer]',
       float32Tag = '[object Float32Array]',
@@ -231,8 +232,8 @@
 
   /** Used to assign default `context` object properties. */
   var contextProps = [
-    'Array', 'Date', 'Error', 'Float32Array', 'Float64Array', 'Function',
-    'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
+    'Array', 'Buffer', 'Date', 'Error', 'Float32Array', 'Float64Array',
+    'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
     'Reflect', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
     'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap', '_',
     'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
@@ -1306,7 +1307,8 @@
     );
 
     /** Built-in value references. */
-    var Reflect = context.Reflect,
+    var Buffer = moduleExports ? context.Buffer : undefined,
+        Reflect = context.Reflect,
         Symbol = context.Symbol,
         Uint8Array = context.Uint8Array,
         clearTimeout = context.clearTimeout,
@@ -1339,9 +1341,10 @@
     /** Used to store function metadata. */
     var metaMap = WeakMap && new WeakMap;
 
-    /** Used to detect maps and sets. */
+    /** Used to detect maps, sets, and weakmaps. */
     var mapCtorString = Map ? funcToString.call(Map) : '',
-        setCtorString = Set ? funcToString.call(Set) : '';
+        setCtorString = Set ? funcToString.call(Set) : '',
+        weakMapCtorString = WeakMap ? funcToString.call(WeakMap) : '';
 
     /** Used to convert symbols to primitives and strings. */
     var symbolProto = Symbol ? Symbol.prototype : undefined,
@@ -2251,6 +2254,9 @@
         var tag = getTag(value),
             isFunc = tag == funcTag || tag == genTag;
 
+        if (isBuffer(value)) {
+          return cloneBuffer(value, isDeep);
+        }
         if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
           if (isHostObject(value)) {
             return object ? value : {};
@@ -2336,7 +2342,7 @@
      * @private
      * @param {Function} func The function to delay.
      * @param {number} wait The number of milliseconds to delay invocation.
-     * @param {Object} args The arguments provide to `func`.
+     * @param {Object} args The arguments to provide to `func`.
      * @returns {number} Returns the timer id.
      */
     function baseDelay(func, wait, args) {
@@ -2581,7 +2587,7 @@
 
     /**
      * The base implementation of `_.functions` which creates an array of
-     * `object` function property names filtered from those provided.
+     * `object` function property names filtered from `props`.
      *
      * @private
      * @param {Object} object The object to inspect.
@@ -3708,18 +3714,37 @@
     }
 
     /**
-     * Creates a clone of `buffer`.
+     * Creates a clone of  `buffer`.
      *
      * @private
-     * @param {ArrayBuffer} buffer The array buffer to clone.
+     * @param {Buffer} buffer The buffer to clone.
+     * @param {boolean} [isDeep] Specify a deep clone.
+     * @returns {Buffer} Returns the cloned buffer.
+     */
+    function cloneBuffer(buffer, isDeep) {
+      if (isDeep) {
+        return buffer.slice();
+      }
+      var Ctor = buffer.constructor,
+          result = new Ctor(buffer.length);
+
+      buffer.copy(result);
+      return result;
+    }
+
+    /**
+     * Creates a clone of `arrayBuffer`.
+     *
+     * @private
+     * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
      * @returns {ArrayBuffer} Returns the cloned array buffer.
      */
-    function cloneBuffer(buffer) {
-      var Ctor = buffer.constructor,
-          result = new Ctor(buffer.byteLength),
+    function cloneArrayBuffer(arrayBuffer) {
+      var Ctor = arrayBuffer.constructor,
+          result = new Ctor(arrayBuffer.byteLength),
           view = new Uint8Array(result);
 
-      view.set(new Uint8Array(buffer));
+      view.set(new Uint8Array(arrayBuffer));
       return result;
     }
 
@@ -3785,7 +3810,7 @@
       var buffer = typedArray.buffer,
           Ctor = typedArray.constructor;
 
-      return new Ctor(isDeep ? cloneBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
+      return new Ctor(isDeep ? cloneArrayBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
     }
 
     /**
@@ -4853,19 +4878,20 @@
       return objectToString.call(value);
     }
 
-    // Fallback for IE 11 providing `toStringTag` values for maps and sets.
-    if ((Map && getTag(new Map) != mapTag) || (Set && getTag(new Set) != setTag)) {
+    // Fallback for IE 11 providing `toStringTag` values for maps, sets, and weakmaps.
+    if ((Map && getTag(new Map) != mapTag) ||
+        (Set && getTag(new Set) != setTag) ||
+        (WeakMap && getTag(new WeakMap) != weakMapTag)) {
       getTag = function(value) {
         var result = objectToString.call(value),
             Ctor = result == objectTag ? value.constructor : null,
             ctorString = typeof Ctor == 'function' ? funcToString.call(Ctor) : '';
 
         if (ctorString) {
-          if (ctorString == mapCtorString) {
-            return mapTag;
-          }
-          if (ctorString == setCtorString) {
-            return setTag;
+          switch (ctorString) {
+            case mapCtorString: return mapTag;
+            case setCtorString: return setTag;
+            case weakMapCtorString: return weakMapTag;
           }
         }
         return result;
@@ -4979,7 +5005,7 @@
       var Ctor = object.constructor;
       switch (tag) {
         case arrayBufferTag:
-          return cloneBuffer(object);
+          return cloneArrayBuffer(object);
 
         case boolTag:
         case dateTag:
@@ -5026,7 +5052,7 @@
     }
 
     /**
-     * Checks if the provided arguments are from an iteratee call.
+     * Checks if the given arguments are from an iteratee call.
      *
      * @private
      * @param {*} value The potential iteratee value argument.
@@ -5434,7 +5460,7 @@
 
     /**
      * Creates an array of unique `array` values not included in the other
-     * provided arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * given arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
      * for equality comparisons.
      *
      * @static
@@ -5914,8 +5940,8 @@
     }
 
     /**
-     * Creates an array of unique values that are included in all of the provided
-     * arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * Creates an array of unique values that are included in all given arrays
+     * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
      * for equality comparisons.
      *
      * @static
@@ -6080,7 +6106,7 @@
     }
 
     /**
-     * Removes all provided values from `array` using
+     * Removes all given values from `array` using
      * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
      * for equality comparisons.
      *
@@ -6637,8 +6663,8 @@
     }
 
     /**
-     * Creates an array of unique values, in order, from all of the provided arrays
-     * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+     * Creates an array of unique values, in order, from all given arrays using
+     * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
      * for equality comparisons.
      *
      * @static
@@ -6849,7 +6875,7 @@
     }
 
     /**
-     * Creates an array excluding all provided values using
+     * Creates an array excluding all given values using
      * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
      * for equality comparisons.
      *
@@ -6872,7 +6898,7 @@
 
     /**
      * Creates an array of unique values that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
-     * of the provided arrays.
+     * of the given arrays.
      *
      * @static
      * @memberOf _
@@ -7898,7 +7924,7 @@
      * Reduces `collection` to a value which is the accumulated result of running
      * each element in `collection` through `iteratee`, where each successive
      * invocation is supplied the return value of the previous. If `accumulator`
-     * is not provided the first element of `collection` is used as the initial
+     * is not given the first element of `collection` is used as the initial
      * value. The iteratee is invoked with four arguments:
      * (accumulator, value, index|key, collection).
      *
@@ -8627,7 +8653,7 @@
         if (maxWait === false) {
           var leadingCall = leading && !timeoutId;
         } else {
-          if (!maxTimeoutId && !leading) {
+          if (!lastCalled && !maxTimeoutId && !leading) {
             lastCalled = stamp;
           }
           var remaining = maxWait - (stamp - lastCalled),
@@ -9426,6 +9452,27 @@
      */
     var isArray = Array.isArray;
 
+    /**
+     * Checks if `value` is classified as an `ArrayBuffer` object.
+     *
+     * @static
+     * @memberOf _
+     * @type Function
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isArrayBuffer(new ArrayBuffer(2));
+     * // => true
+     *
+     * _.isArrayBuffer(new Array(2));
+     * // => false
+     */
+    function isArrayBuffer(value) {
+      return isObjectLike(value) && objectToString.call(value) == arrayBufferTag;
+    }
+
     /**
      * Checks if `value` is array-like. A value is considered array-like if it's
      * not a function and has a `value.length` that's an integer greater than or
@@ -9505,6 +9552,26 @@
         (isObjectLike(value) && objectToString.call(value) == boolTag);
     }
 
+    /**
+     * Checks if `value` is a buffer.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
+     * @example
+     *
+     * _.isBuffer(new Buffer(2));
+     * // => true
+     *
+     * _.isBuffer(new Uint8Array(2));
+     * // => false
+     */
+    var isBuffer = !Buffer ? constant(false) : function(value) {
+      return value instanceof Buffer;
+    };
+
     /**
      * Checks if `value` is classified as a `Date` object.
      *
@@ -9838,6 +9905,26 @@
       return !!value && typeof value == 'object';
     }
 
+    /**
+     * Checks if `value` is classified as a `Map` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isMap(new Map);
+     * // => true
+     *
+     * _.isMap(new WeakMap);
+     * // => false
+     */
+    function isMap(value) {
+      return isObjectLike(value) && getTag(value) == mapTag;
+    }
+
     /**
      * Performs a deep comparison between `object` and `source` to determine if
      * `object` contains equivalent property values.
@@ -10123,6 +10210,26 @@
       return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
     }
 
+    /**
+     * Checks if `value` is classified as a `Set` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isSet(new Set);
+     * // => true
+     *
+     * _.isSet(new WeakSet);
+     * // => false
+     */
+    function isSet(value) {
+      return isObjectLike(value) && getTag(value) == setTag;
+    }
+
     /**
      * Checks if `value` is classified as a `String` primitive or object.
      *
@@ -10205,6 +10312,46 @@
       return value === undefined;
     }
 
+    /**
+     * Checks if `value` is classified as a `WeakMap` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isWeakMap(new WeakMap);
+     * // => true
+     *
+     * _.isWeakMap(new Map);
+     * // => false
+     */
+    function isWeakMap(value) {
+      return isObjectLike(value) && getTag(value) == weakMapTag;
+    }
+
+    /**
+     * Checks if `value` is classified as a `WeakSet` object.
+     *
+     * @static
+     * @memberOf _
+     * @category Lang
+     * @param {*} value The value to check.
+     * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+     * @example
+     *
+     * _.isWeakSet(new WeakSet);
+     * // => true
+     *
+     * _.isWeakSet(new Set);
+     * // => false
+     */
+    function isWeakSet(value) {
+      return isObjectLike(value) && objectToString.call(value) == weakSetTag;
+    }
+
     /**
      * Checks if `value` is less than `other`.
      *
@@ -10639,7 +10786,7 @@
 
     /**
      * Creates an object that inherits from the `prototype` object. If a `properties`
-     * object is provided its own enumerable properties are assigned to the created object.
+     * object is given its own enumerable properties are assigned to the created object.
      *
      * @static
      * @memberOf _
@@ -12405,7 +12552,7 @@
      * in "interpolate" delimiters, HTML-escape interpolated data properties in
      * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
      * properties may be accessed as free variables in the template. If a setting
-     * object is provided it takes precedence over `_.templateSettings` values.
+     * object is given it takes precedence over `_.templateSettings` values.
      *
      * **Note:** In the development build `_.template` utilizes
      * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
@@ -13083,9 +13230,9 @@
     }
 
     /**
-     * Creates a function that returns the result of invoking the provided
-     * functions with the `this` binding of the created function, where each
-     * successive invocation is supplied the return value of the previous.
+     * Creates a function that returns the result of invoking the given functions
+     * with the `this` binding of the created function, where each successive
+     * invocation is supplied the return value of the previous.
      *
      * @static
      * @memberOf _
@@ -13106,7 +13253,7 @@
 
     /**
      * This method is like `_.flow` except that it creates a function that
-     * invokes the provided functions from right to left.
+     * invokes the given functions from right to left.
      *
      * @static
      * @memberOf _
@@ -13126,7 +13273,7 @@
     var flowRight = createFlow(true);
 
     /**
-     * This method returns the first argument provided to it.
+     * This method returns the first argument given to it.
      *
      * @static
      * @memberOf _
@@ -13678,7 +13825,7 @@
     }
 
     /**
-     * Generates a unique ID. If `prefix` is provided the ID is appended to it.
+     * Generates a unique ID. If `prefix` is given the ID is appended to it.
      *
      * @static
      * @memberOf _
@@ -13716,6 +13863,9 @@
      */
     function add(augend, addend) {
       var result;
+      if (augend === undefined && addend === undefined) {
+        return 0;
+      }
       if (augend !== undefined) {
         result = augend;
       }
@@ -13926,6 +14076,9 @@
      */
     function subtract(minuend, subtrahend) {
       var result;
+      if (minuend === undefined && subtrahend === undefined) {
+        return 0;
+      }
       if (minuend !== undefined) {
         result = minuend;
       }
@@ -14212,9 +14365,11 @@
     lodash.invoke = invoke;
     lodash.isArguments = isArguments;
     lodash.isArray = isArray;
+    lodash.isArrayBuffer = isArrayBuffer;
     lodash.isArrayLike = isArrayLike;
     lodash.isArrayLikeObject = isArrayLikeObject;
     lodash.isBoolean = isBoolean;
+    lodash.isBuffer = isBuffer;
     lodash.isDate = isDate;
     lodash.isElement = isElement;
     lodash.isEmpty = isEmpty;
@@ -14225,6 +14380,7 @@
     lodash.isFunction = isFunction;
     lodash.isInteger = isInteger;
     lodash.isLength = isLength;
+    lodash.isMap = isMap;
     lodash.isMatch = isMatch;
     lodash.isMatchWith = isMatchWith;
     lodash.isNaN = isNaN;
@@ -14237,10 +14393,13 @@
     lodash.isPlainObject = isPlainObject;
     lodash.isRegExp = isRegExp;
     lodash.isSafeInteger = isSafeInteger;
+    lodash.isSet = isSet;
     lodash.isString = isString;
     lodash.isSymbol = isSymbol;
     lodash.isTypedArray = isTypedArray;
     lodash.isUndefined = isUndefined;
+    lodash.isWeakMap = isWeakMap;
+    lodash.isWeakSet = isWeakSet;
     lodash.join = join;
     lodash.kebabCase = kebabCase;
     lodash.last = last;
diff --git a/package.json b/package.json
index 8fe6b0536..d2d7465b8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash",
-  "version": "4.2.1",
+  "version": "4.3.0",
   "description": "Lodash modular utilities.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
diff --git a/partial.js b/partial.js
index e29a593fa..e857ab7d2 100644
--- a/partial.js
+++ b/partial.js
@@ -44,4 +44,7 @@ var partial = rest(function(func, partials) {
   return createWrapper(func, PARTIAL_FLAG, undefined, partials, holders);
 });
 
+// Assign default placeholders.
+partial.placeholder = {};
+
 module.exports = partial;
diff --git a/partialRight.js b/partialRight.js
index 502f3a474..4fdb470bc 100644
--- a/partialRight.js
+++ b/partialRight.js
@@ -43,4 +43,7 @@ var partialRight = rest(function(func, partials) {
   return createWrapper(func, PARTIAL_RIGHT_FLAG, undefined, partials, holders);
 });
 
+// Assign default placeholders.
+partialRight.placeholder = {};
+
 module.exports = partialRight;
diff --git a/pull.js b/pull.js
index 29099cdb2..c2f6c1e31 100644
--- a/pull.js
+++ b/pull.js
@@ -2,7 +2,7 @@ var pullAll = require('./pullAll'),
     rest = require('./rest');
 
 /**
- * Removes all provided values from `array` using
+ * Removes all given values from `array` using
  * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
  * for equality comparisons.
  *
diff --git a/reduce.js b/reduce.js
index 3f99c43e3..98da3ff0a 100644
--- a/reduce.js
+++ b/reduce.js
@@ -8,7 +8,7 @@ var arrayReduce = require('./_arrayReduce'),
  * Reduces `collection` to a value which is the accumulated result of running
  * each element in `collection` through `iteratee`, where each successive
  * invocation is supplied the return value of the previous. If `accumulator`
- * is not provided the first element of `collection` is used as the initial
+ * is not given the first element of `collection` is used as the initial
  * value. The iteratee is invoked with four arguments:
  * (accumulator, value, index|key, collection).
  *
diff --git a/subtract.js b/subtract.js
index b1836c8ed..9ce53f2a3 100644
--- a/subtract.js
+++ b/subtract.js
@@ -14,6 +14,9 @@
  */
 function subtract(minuend, subtrahend) {
   var result;
+  if (minuend === undefined && subtrahend === undefined) {
+    return 0;
+  }
   if (minuend !== undefined) {
     result = minuend;
   }
diff --git a/template.js b/template.js
index 14a090d5b..c09fcde87 100644
--- a/template.js
+++ b/template.js
@@ -29,7 +29,7 @@ var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
  * in "interpolate" delimiters, HTML-escape interpolated data properties in
  * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
  * properties may be accessed as free variables in the template. If a setting
- * object is provided it takes precedence over `_.templateSettings` values.
+ * object is given it takes precedence over `_.templateSettings` values.
  *
  * **Note:** In the development build `_.template` utilizes
  * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
diff --git a/union.js b/union.js
index 0aabbfba3..fafe1885e 100644
--- a/union.js
+++ b/union.js
@@ -3,8 +3,8 @@ var baseFlatten = require('./_baseFlatten'),
     rest = require('./rest');
 
 /**
- * Creates an array of unique values, in order, from all of the provided arrays
- * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * Creates an array of unique values, in order, from all given arrays using
+ * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
  * for equality comparisons.
  *
  * @static
diff --git a/uniqueId.js b/uniqueId.js
index 872d3305f..a39b2bcbe 100644
--- a/uniqueId.js
+++ b/uniqueId.js
@@ -4,7 +4,7 @@ var toString = require('./toString');
 var idCounter = 0;
 
 /**
- * Generates a unique ID. If `prefix` is provided the ID is appended to it.
+ * Generates a unique ID. If `prefix` is given the ID is appended to it.
  *
  * @static
  * @memberOf _
diff --git a/without.js b/without.js
index 8ff1bf22d..b7dea5d5c 100644
--- a/without.js
+++ b/without.js
@@ -3,7 +3,7 @@ var baseDifference = require('./_baseDifference'),
     rest = require('./rest');
 
 /**
- * Creates an array excluding all provided values using
+ * Creates an array excluding all given values using
  * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
  * for equality comparisons.
  *
diff --git a/xor.js b/xor.js
index 05ae2f18c..e92eee2e0 100644
--- a/xor.js
+++ b/xor.js
@@ -5,7 +5,7 @@ var arrayFilter = require('./_arrayFilter'),
 
 /**
  * Creates an array of unique values that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
- * of the provided arrays.
+ * of the given arrays.
  *
  * @static
  * @memberOf _