diff --git a/README.md b/README.md
index 38088be4a..b9e56a5bb 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash-es v4.5.1
+# lodash-es v4.6.0
 
 The [lodash](https://lodash.com/) library exported as [ES](http://www.ecma-international.org/ecma-262/6.0/) modules.
 
@@ -7,4 +7,4 @@ Generated using [lodash-cli](https://www.npmjs.com/package/lodash-cli):
 $ lodash modularize exports=es -o ./
 ```
 
-See the [package source](https://github.com/lodash/lodash/tree/4.5.1-es) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.6.0-es) for more details.
diff --git a/_addMapEntry.js b/_addMapEntry.js
index 486c184ff..a5094faf0 100644
--- a/_addMapEntry.js
+++ b/_addMapEntry.js
@@ -7,6 +7,7 @@
  * @returns {Object} Returns `map`.
  */
 function addMapEntry(map, pair) {
+  // Don't return `Map#set` because it doesn't return the map instance in IE 11.
   map.set(pair[0], pair[1]);
   return map;
 }
diff --git a/_arrayFilter.js b/_arrayFilter.js
index 247b29891..dadc70fce 100644
--- a/_arrayFilter.js
+++ b/_arrayFilter.js
@@ -10,13 +10,13 @@
 function arrayFilter(array, predicate) {
   var index = -1,
       length = array.length,
-      resIndex = -1,
+      resIndex = 0,
       result = [];
 
   while (++index < length) {
     var value = array[index];
     if (predicate(value, index, array)) {
-      result[++resIndex] = value;
+      result[resIndex++] = value;
     }
   }
   return result;
diff --git a/_arrayIncludesWith.js b/_arrayIncludesWith.js
index b84117693..4a3baab93 100644
--- a/_arrayIncludesWith.js
+++ b/_arrayIncludesWith.js
@@ -1,6 +1,5 @@
 /**
- * A specialized version of `_.includesWith` for arrays without support for
- * specifying an index to search from.
+ * This function is like `arrayIncludes` except that it accepts a comparator.
  *
  * @private
  * @param {Array} array The array to search.
diff --git a/_assignMergeValue.js b/_assignMergeValue.js
index 7b1353d25..63bab0e63 100644
--- a/_assignMergeValue.js
+++ b/_assignMergeValue.js
@@ -1,7 +1,8 @@
 import eq from './eq';
 
 /**
- * This function is like `assignValue` except that it doesn't assign `undefined` values.
+ * This function is like `assignValue` except that it doesn't assign
+ * `undefined` values.
  *
  * @private
  * @param {Object} object The object to modify.
diff --git a/_baseIndexOfWith.js b/_baseIndexOfWith.js
new file mode 100644
index 000000000..028ad9159
--- /dev/null
+++ b/_baseIndexOfWith.js
@@ -0,0 +1,23 @@
+/**
+ * This function is like `baseIndexOf` except that it accepts a comparator.
+ *
+ * @private
+ * @param {Array} array The array to search.
+ * @param {*} value The value to search for.
+ * @param {number} fromIndex The index to search from.
+ * @param {Function} comparator The comparator invoked per element.
+ * @returns {number} Returns the index of the matched value, else `-1`.
+ */
+function baseIndexOfWith(array, value, fromIndex, comparator) {
+  var index = fromIndex - 1,
+      length = array.length;
+
+  while (++index < length) {
+    if (comparator(array[index], value)) {
+      return index;
+    }
+  }
+  return -1;
+}
+
+export default baseIndexOfWith;
diff --git a/_baseIntersection.js b/_baseIntersection.js
index 1a20c3437..d64c75fd1 100644
--- a/_baseIntersection.js
+++ b/_baseIntersection.js
@@ -5,6 +5,9 @@ import arrayMap from './_arrayMap';
 import baseUnary from './_baseUnary';
 import cacheHas from './_cacheHas';
 
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMin = Math.min;
+
 /**
  * The base implementation of methods like `_.intersection`, without support
  * for iteratee shorthands, that accepts an array of arrays to inspect.
@@ -17,9 +20,11 @@ import cacheHas from './_cacheHas';
  */
 function baseIntersection(arrays, iteratee, comparator) {
   var includes = comparator ? arrayIncludesWith : arrayIncludes,
+      length = arrays[0].length,
       othLength = arrays.length,
       othIndex = othLength,
       caches = Array(othLength),
+      maxLength = Infinity,
       result = [];
 
   while (othIndex--) {
@@ -27,18 +32,18 @@ function baseIntersection(arrays, iteratee, comparator) {
     if (othIndex && iteratee) {
       array = arrayMap(array, baseUnary(iteratee));
     }
-    caches[othIndex] = !comparator && (iteratee || array.length >= 120)
+    maxLength = nativeMin(array.length, maxLength);
+    caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
       ? new SetCache(othIndex && array)
       : undefined;
   }
   array = arrays[0];
 
   var index = -1,
-      length = array.length,
       seen = caches[0];
 
   outer:
-  while (++index < length) {
+  while (++index < length && result.length < maxLength) {
     var value = array[index],
         computed = iteratee ? iteratee(value) : value;
 
@@ -46,7 +51,7 @@ function baseIntersection(arrays, iteratee, comparator) {
           ? cacheHas(seen, computed)
           : includes(result, computed, comparator)
         )) {
-      var othIndex = othLength;
+      othIndex = othLength;
       while (--othIndex) {
         var cache = caches[othIndex];
         if (!(cache
diff --git a/_baseIsEqualDeep.js b/_baseIsEqualDeep.js
index 37a8fe323..41484522a 100644
--- a/_baseIsEqualDeep.js
+++ b/_baseIsEqualDeep.js
@@ -43,33 +43,28 @@ function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {
 
   if (!objIsArr) {
     objTag = getTag(object);
-    if (objTag == argsTag) {
-      objTag = objectTag;
-    } else if (objTag != objectTag) {
-      objIsArr = isTypedArray(object);
-    }
+    objTag = objTag == argsTag ? objectTag : objTag;
   }
   if (!othIsArr) {
     othTag = getTag(other);
-    if (othTag == argsTag) {
-      othTag = objectTag;
-    } else if (othTag != objectTag) {
-      othIsArr = isTypedArray(other);
-    }
+    othTag = othTag == argsTag ? objectTag : othTag;
   }
   var objIsObj = objTag == objectTag && !isHostObject(object),
       othIsObj = othTag == objectTag && !isHostObject(other),
       isSameTag = objTag == othTag;
 
-  if (isSameTag && !(objIsArr || objIsObj)) {
-    return equalByTag(object, other, objTag, equalFunc, customizer, bitmask);
+  if (isSameTag && !objIsObj) {
+    stack || (stack = new Stack);
+    return (objIsArr || isTypedArray(object))
+      ? equalArrays(object, other, equalFunc, customizer, bitmask, stack)
+      : equalByTag(object, other, objTag, equalFunc, customizer, bitmask, stack);
   }
-  var isPartial = bitmask & PARTIAL_COMPARE_FLAG;
-  if (!isPartial) {
+  if (!(bitmask & PARTIAL_COMPARE_FLAG)) {
     var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
         othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
 
     if (objIsWrapped || othIsWrapped) {
+      stack || (stack = new Stack);
       return equalFunc(objIsWrapped ? object.value() : object, othIsWrapped ? other.value() : other, customizer, bitmask, stack);
     }
   }
@@ -77,7 +72,7 @@ function baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {
     return false;
   }
   stack || (stack = new Stack);
-  return (objIsArr ? equalArrays : equalObjects)(object, other, equalFunc, customizer, bitmask, stack);
+  return equalObjects(object, other, equalFunc, customizer, bitmask, stack);
 }
 
 export default baseIsEqualDeep;
diff --git a/_baseMergeDeep.js b/_baseMergeDeep.js
index 828330172..dff6c2dff 100644
--- a/_baseMergeDeep.js
+++ b/_baseMergeDeep.js
@@ -50,7 +50,7 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       }
       else {
         isCommon = false;
-        newValue = baseClone(srcValue, true);
+        newValue = baseClone(srcValue, !customizer);
       }
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
@@ -59,7 +59,7 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       }
       else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
         isCommon = false;
-        newValue = baseClone(srcValue, true);
+        newValue = baseClone(srcValue, !customizer);
       }
       else {
         newValue = objValue;
@@ -75,6 +75,7 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
     // Recursively merge objects and arrays (susceptible to call stack limits).
     mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
   }
+  stack['delete'](srcValue);
   assignMergeValue(object, key, newValue);
 }
 
diff --git a/_baseOrderBy.js b/_baseOrderBy.js
index f987cb183..9f892d07c 100644
--- a/_baseOrderBy.js
+++ b/_baseOrderBy.js
@@ -14,12 +14,8 @@ import compareMultiple from './_compareMultiple';
  * @returns {Array} Returns the new sorted array.
  */
 function baseOrderBy(collection, iteratees, orders) {
-  var index = -1,
-      toIteratee = baseIteratee;
-
-  iteratees = arrayMap(iteratees.length ? iteratees : Array(1), function(iteratee) {
-    return toIteratee(iteratee);
-  });
+  var index = -1;
+  iteratees = arrayMap(iteratees.length ? iteratees : Array(1), baseIteratee);
 
   var result = baseMap(collection, function(value, key, collection) {
     var criteria = arrayMap(iteratees, function(iteratee) {
diff --git a/_basePullAll.js b/_basePullAll.js
index 7f3cf3037..f819d5ac8 100644
--- a/_basePullAll.js
+++ b/_basePullAll.js
@@ -1,15 +1,47 @@
-import basePullAllBy from './_basePullAllBy';
+import arrayMap from './_arrayMap';
+import baseIndexOf from './_baseIndexOf';
+import baseIndexOfWith from './_baseIndexOfWith';
+import baseUnary from './_baseUnary';
+
+/** Used for built-in method references. */
+var arrayProto = Array.prototype;
+
+/** Built-in value references. */
+var splice = arrayProto.splice;
 
 /**
- * The base implementation of `_.pullAll`.
+ * The base implementation of `_.pullAllBy` without support for iteratee
+ * shorthands.
  *
  * @private
  * @param {Array} array The array to modify.
  * @param {Array} values The values to remove.
+ * @param {Function} [iteratee] The iteratee invoked per element.
+ * @param {Function} [comparator] The comparator invoked per element.
  * @returns {Array} Returns `array`.
  */
-function basePullAll(array, values) {
-  return basePullAllBy(array, values);
+function basePullAll(array, values, iteratee, comparator) {
+  var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
+      index = -1,
+      length = values.length,
+      seen = array;
+
+  if (iteratee) {
+    seen = arrayMap(array, baseUnary(iteratee));
+  }
+  while (++index < length) {
+    var fromIndex = 0,
+        value = values[index],
+        computed = iteratee ? iteratee(value) : value;
+
+    while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
+      if (seen !== array) {
+        splice.call(seen, fromIndex, 1);
+      }
+      splice.call(array, fromIndex, 1);
+    }
+  }
+  return array;
 }
 
 export default basePullAll;
diff --git a/_basePullAllBy.js b/_basePullAllBy.js
deleted file mode 100644
index 1a6ca9e6e..000000000
--- a/_basePullAllBy.js
+++ /dev/null
@@ -1,43 +0,0 @@
-import arrayMap from './_arrayMap';
-import baseIndexOf from './_baseIndexOf';
-
-/** Used for built-in method references. */
-var arrayProto = Array.prototype;
-
-/** Built-in value references. */
-var splice = arrayProto.splice;
-
-/**
- * The base implementation of `_.pullAllBy` without support for iteratee
- * shorthands.
- *
- * @private
- * @param {Array} array The array to modify.
- * @param {Array} values The values to remove.
- * @param {Function} [iteratee] The iteratee invoked per element.
- * @returns {Array} Returns `array`.
- */
-function basePullAllBy(array, values, iteratee) {
-  var index = -1,
-      length = values.length,
-      seen = array;
-
-  if (iteratee) {
-    seen = arrayMap(array, function(value) { return iteratee(value); });
-  }
-  while (++index < length) {
-    var fromIndex = 0,
-        value = values[index],
-        computed = iteratee ? iteratee(value) : value;
-
-    while ((fromIndex = baseIndexOf(seen, computed, fromIndex)) > -1) {
-      if (seen !== array) {
-        splice.call(seen, fromIndex, 1);
-      }
-      splice.call(array, fromIndex, 1);
-    }
-  }
-  return array;
-}
-
-export default basePullAllBy;
diff --git a/_baseSortBy.js b/_baseSortBy.js
index aeb74542f..e2041cd66 100644
--- a/_baseSortBy.js
+++ b/_baseSortBy.js
@@ -1,7 +1,7 @@
 /**
- * The base implementation of `_.sortBy` which uses `comparer` to define
- * the sort order of `array` and replaces criteria objects with their
- * corresponding values.
+ * The base implementation of `_.sortBy` which uses `comparer` to define the
+ * sort order of `array` and replaces criteria objects with their corresponding
+ * values.
  *
  * @private
  * @param {Array} array The array to sort.
diff --git a/_baseSortedUniqBy.js b/_baseSortedUniqBy.js
index 8484197be..d31384f5d 100644
--- a/_baseSortedUniqBy.js
+++ b/_baseSortedUniqBy.js
@@ -15,7 +15,7 @@ function baseSortedUniqBy(array, iteratee) {
       value = array[0],
       computed = iteratee ? iteratee(value) : value,
       seen = computed,
-      resIndex = 0,
+      resIndex = 1,
       result = [value];
 
   while (++index < length) {
@@ -24,7 +24,7 @@ function baseSortedUniqBy(array, iteratee) {
 
     if (!eq(computed, seen)) {
       seen = computed;
-      result[++resIndex] = value;
+      result[resIndex++] = value;
     }
   }
   return result;
diff --git a/_baseUpdate.js b/_baseUpdate.js
new file mode 100644
index 000000000..79cea3ff2
--- /dev/null
+++ b/_baseUpdate.js
@@ -0,0 +1,18 @@
+import baseGet from './_baseGet';
+import baseSet from './_baseSet';
+
+/**
+ * The base implementation of `_.update`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @param {Array|string} path The path of the property to update.
+ * @param {Function} updater The function to produce the updated value.
+ * @param {Function} [customizer] The function to customize path creation.
+ * @returns {Object} Returns `object`.
+ */
+function baseUpdate(object, path, updater, customizer) {
+  return baseSet(object, path, updater(baseGet(object, path)), customizer);
+}
+
+export default baseUpdate;
diff --git a/_cloneArrayBuffer.js b/_cloneArrayBuffer.js
index ad319449f..2b3a5eba5 100644
--- a/_cloneArrayBuffer.js
+++ b/_cloneArrayBuffer.js
@@ -8,11 +8,8 @@ import Uint8Array from './_Uint8Array';
  * @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));
+  var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
+  new Uint8Array(result).set(new Uint8Array(arrayBuffer));
   return result;
 }
 
diff --git a/_cloneBuffer.js b/_cloneBuffer.js
index 0619230af..c1139dd8a 100644
--- a/_cloneBuffer.js
+++ b/_cloneBuffer.js
@@ -10,9 +10,7 @@ function cloneBuffer(buffer, isDeep) {
   if (isDeep) {
     return buffer.slice();
   }
-  var Ctor = buffer.constructor,
-      result = new Ctor(buffer.length);
-
+  var result = new buffer.constructor(buffer.length);
   buffer.copy(result);
   return result;
 }
diff --git a/_cloneMap.js b/_cloneMap.js
index c3defb6ae..122e72c0d 100644
--- a/_cloneMap.js
+++ b/_cloneMap.js
@@ -10,8 +10,7 @@ import mapToArray from './_mapToArray';
  * @returns {Object} Returns the cloned map.
  */
 function cloneMap(map) {
-  var Ctor = map.constructor;
-  return arrayReduce(mapToArray(map), addMapEntry, new Ctor);
+  return arrayReduce(mapToArray(map), addMapEntry, new map.constructor);
 }
 
 export default cloneMap;
diff --git a/_cloneRegExp.js b/_cloneRegExp.js
index 4942fa44b..0ddb49b4c 100644
--- a/_cloneRegExp.js
+++ b/_cloneRegExp.js
@@ -9,9 +9,7 @@ var reFlags = /\w*$/;
  * @returns {Object} Returns the cloned regexp.
  */
 function cloneRegExp(regexp) {
-  var Ctor = regexp.constructor,
-      result = new Ctor(regexp.source, reFlags.exec(regexp));
-
+  var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
   result.lastIndex = regexp.lastIndex;
   return result;
 }
diff --git a/_cloneSet.js b/_cloneSet.js
index 416882635..2189362e4 100644
--- a/_cloneSet.js
+++ b/_cloneSet.js
@@ -10,8 +10,7 @@ import setToArray from './_setToArray';
  * @returns {Object} Returns the cloned set.
  */
 function cloneSet(set) {
-  var Ctor = set.constructor;
-  return arrayReduce(setToArray(set), addSetEntry, new Ctor);
+  return arrayReduce(setToArray(set), addSetEntry, new set.constructor);
 }
 
 export default cloneSet;
diff --git a/_cloneSymbol.js b/_cloneSymbol.js
index 597c83cb3..9cd1e1c09 100644
--- a/_cloneSymbol.js
+++ b/_cloneSymbol.js
@@ -2,7 +2,7 @@ import Symbol from './_Symbol';
 
 /** Used to convert symbols to primitives and strings. */
 var symbolProto = Symbol ? Symbol.prototype : undefined,
-    symbolValueOf = Symbol ? symbolProto.valueOf : undefined;
+    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;
 
 /**
  * Creates a clone of the `symbol` object.
@@ -12,7 +12,7 @@ var symbolProto = Symbol ? Symbol.prototype : undefined,
  * @returns {Object} Returns the cloned symbol object.
  */
 function cloneSymbol(symbol) {
-  return Symbol ? Object(symbolValueOf.call(symbol)) : {};
+  return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
 }
 
 export default cloneSymbol;
diff --git a/_cloneTypedArray.js b/_cloneTypedArray.js
index b1f8f6890..abc4554d9 100644
--- a/_cloneTypedArray.js
+++ b/_cloneTypedArray.js
@@ -9,11 +9,8 @@ import cloneArrayBuffer from './_cloneArrayBuffer';
  * @returns {Object} Returns the cloned typed array.
  */
 function cloneTypedArray(typedArray, isDeep) {
-  var arrayBuffer = typedArray.buffer,
-      buffer = isDeep ? cloneArrayBuffer(arrayBuffer) : arrayBuffer,
-      Ctor = typedArray.constructor;
-
-  return new Ctor(buffer, typedArray.byteOffset, typedArray.length);
+  var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
+  return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
 }
 
 export default cloneTypedArray;
diff --git a/_createFlow.js b/_createFlow.js
index 635c423db..e9e1d5e35 100644
--- a/_createFlow.js
+++ b/_createFlow.js
@@ -6,18 +6,18 @@ import isArray from './isArray';
 import isLaziable from './_isLaziable';
 import rest from './rest';
 
-/** Used to compose bitmasks for wrapper metadata. */
-var CURRY_FLAG = 8,
-    PARTIAL_FLAG = 32,
-    ARY_FLAG = 128,
-    REARG_FLAG = 256;
-
 /** Used as the size to enable large array optimizations. */
 var LARGE_ARRAY_SIZE = 200;
 
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
+/** Used to compose bitmasks for wrapper metadata. */
+var CURRY_FLAG = 8,
+    PARTIAL_FLAG = 32,
+    ARY_FLAG = 128,
+    REARG_FLAG = 256;
+
 /**
  * Creates a `_.flow` or `_.flowRight` function.
  *
diff --git a/_createWrapper.js b/_createWrapper.js
index c15e68a4d..846e94fc6 100644
--- a/_createWrapper.js
+++ b/_createWrapper.js
@@ -8,6 +8,9 @@ import mergeData from './_mergeData';
 import setData from './_setData';
 import toInteger from './toInteger';
 
+/** Used as the `TypeError` message for "Functions" methods. */
+var FUNC_ERROR_TEXT = 'Expected a function';
+
 /** Used to compose bitmasks for wrapper metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
@@ -16,9 +19,6 @@ var BIND_FLAG = 1,
     PARTIAL_FLAG = 32,
     PARTIAL_RIGHT_FLAG = 64;
 
-/** Used as the `TypeError` message for "Functions" methods. */
-var FUNC_ERROR_TEXT = 'Expected a function';
-
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeMax = Math.max;
 
diff --git a/_equalArrays.js b/_equalArrays.js
index ff975ccee..ce870e5e2 100644
--- a/_equalArrays.js
+++ b/_equalArrays.js
@@ -12,9 +12,9 @@ var UNORDERED_COMPARE_FLAG = 1,
  * @param {Array} array The array to compare.
  * @param {Array} other The other array to compare.
  * @param {Function} equalFunc The function to determine equivalents of values.
- * @param {Function} [customizer] The function to customize comparisons.
- * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details.
- * @param {Object} [stack] Tracks traversed `array` and `other` objects.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details.
+ * @param {Object} stack Tracks traversed `array` and `other` objects.
  * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
  */
 function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
diff --git a/_equalByTag.js b/_equalByTag.js
index 005e34a49..bc9e540b8 100644
--- a/_equalByTag.js
+++ b/_equalByTag.js
@@ -1,5 +1,6 @@
 import Symbol from './_Symbol';
 import Uint8Array from './_Uint8Array';
+import equalArrays from './_equalArrays';
 import mapToArray from './_mapToArray';
 import setToArray from './_setToArray';
 
@@ -22,7 +23,7 @@ var arrayBufferTag = '[object ArrayBuffer]';
 
 /** Used to convert symbols to primitives and strings. */
 var symbolProto = Symbol ? Symbol.prototype : undefined,
-    symbolValueOf = Symbol ? symbolProto.valueOf : undefined;
+    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;
 
 /**
  * A specialized version of `baseIsEqualDeep` for comparing objects of
@@ -36,11 +37,12 @@ var symbolProto = Symbol ? Symbol.prototype : undefined,
  * @param {Object} other The other object to compare.
  * @param {string} tag The `toStringTag` of the objects to compare.
  * @param {Function} equalFunc The function to determine equivalents of values.
- * @param {Function} [customizer] The function to customize comparisons.
- * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details.
+ * @param {Object} stack Tracks traversed `object` and `other` objects.
  * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
  */
-function equalByTag(object, other, tag, equalFunc, customizer, bitmask) {
+function equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {
   switch (tag) {
     case arrayBufferTag:
       if ((object.byteLength != other.byteLength) ||
@@ -75,12 +77,21 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask) {
       var isPartial = bitmask & PARTIAL_COMPARE_FLAG;
       convert || (convert = setToArray);
 
+      if (object.size != other.size && !isPartial) {
+        return false;
+      }
+      // Assume cyclic values are equal.
+      var stacked = stack.get(object);
+      if (stacked) {
+        return stacked == other;
+      }
       // Recursively compare objects (susceptible to call stack limits).
-      return (isPartial || object.size == other.size) &&
-        equalFunc(convert(object), convert(other), customizer, bitmask | UNORDERED_COMPARE_FLAG);
+      return equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask | UNORDERED_COMPARE_FLAG, stack.set(object, other));
 
     case symbolTag:
-      return !!Symbol && (symbolValueOf.call(object) == symbolValueOf.call(other));
+      if (symbolValueOf) {
+        return symbolValueOf.call(object) == symbolValueOf.call(other);
+      }
   }
   return false;
 }
diff --git a/_equalObjects.js b/_equalObjects.js
index 7511bb2dc..24bc79606 100644
--- a/_equalObjects.js
+++ b/_equalObjects.js
@@ -12,9 +12,9 @@ var PARTIAL_COMPARE_FLAG = 2;
  * @param {Object} object The object to compare.
  * @param {Object} other The other object to compare.
  * @param {Function} equalFunc The function to determine equivalents of values.
- * @param {Function} [customizer] The function to customize comparisons.
- * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual` for more details.
- * @param {Object} [stack] Tracks traversed `object` and `other` objects.
+ * @param {Function} customizer The function to customize comparisons.
+ * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details.
+ * @param {Object} stack Tracks traversed `object` and `other` objects.
  * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
  */
 function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
diff --git a/_getNative.js b/_getNative.js
index b91f8dc61..a1dccd550 100644
--- a/_getNative.js
+++ b/_getNative.js
@@ -9,7 +9,7 @@ import isNative from './isNative';
  * @returns {*} Returns the function if it's native, else `undefined`.
  */
 function getNative(object, key) {
-  var value = object == null ? undefined : object[key];
+  var value = object[key];
   return isNative(value) ? value : undefined;
 }
 
diff --git a/_initCloneObject.js b/_initCloneObject.js
index b6c8dd58c..35a1cba07 100644
--- a/_initCloneObject.js
+++ b/_initCloneObject.js
@@ -1,5 +1,4 @@
 import baseCreate from './_baseCreate';
-import isFunction from './isFunction';
 import isPrototype from './_isPrototype';
 
 /** Built-in value references. */
@@ -13,7 +12,7 @@ var getPrototypeOf = Object.getPrototypeOf;
  * @returns {Object} Returns the initialized clone.
  */
 function initCloneObject(object) {
-  return (isFunction(object.constructor) && !isPrototype(object))
+  return (typeof object.constructor == 'function' && !isPrototype(object))
     ? baseCreate(getPrototypeOf(object))
     : {};
 }
diff --git a/_isPrototype.js b/_isPrototype.js
index 9214b1c4d..f6c7660d0 100644
--- a/_isPrototype.js
+++ b/_isPrototype.js
@@ -1,5 +1,3 @@
-import isFunction from './isFunction';
-
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
@@ -12,7 +10,7 @@ var objectProto = Object.prototype;
  */
 function isPrototype(value) {
   var Ctor = value && value.constructor,
-      proto = (isFunction(Ctor) && Ctor.prototype) || objectProto;
+      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
 
   return value === proto;
 }
diff --git a/_mergeData.js b/_mergeData.js
index aef1c8077..224a80b00 100644
--- a/_mergeData.js
+++ b/_mergeData.js
@@ -3,6 +3,9 @@ import composeArgsRight from './_composeArgsRight';
 import copyArray from './_copyArray';
 import replaceHolders from './_replaceHolders';
 
+/** Used as the internal argument placeholder. */
+var PLACEHOLDER = '__lodash_placeholder__';
+
 /** Used to compose bitmasks for wrapper metadata. */
 var BIND_FLAG = 1,
     BIND_KEY_FLAG = 2,
@@ -11,9 +14,6 @@ var BIND_FLAG = 1,
     ARY_FLAG = 128,
     REARG_FLAG = 256;
 
-/** Used as the internal argument placeholder. */
-var PLACEHOLDER = '__lodash_placeholder__';
-
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeMin = Math.min;
 
diff --git a/_mergeDefaults.js b/_mergeDefaults.js
index 05eae7dee..f8b8c2907 100644
--- a/_mergeDefaults.js
+++ b/_mergeDefaults.js
@@ -15,8 +15,7 @@ import isObject from './isObject';
  */
 function mergeDefaults(objValue, srcValue, key, object, source, stack) {
   if (isObject(objValue) && isObject(srcValue)) {
-    stack.set(srcValue, objValue);
-    baseMerge(objValue, srcValue, undefined, mergeDefaults, stack);
+    baseMerge(objValue, srcValue, undefined, mergeDefaults, stack.set(srcValue, objValue));
   }
   return objValue;
 }
diff --git a/_replaceHolders.js b/_replaceHolders.js
index 7a2e62e78..e63605416 100644
--- a/_replaceHolders.js
+++ b/_replaceHolders.js
@@ -13,14 +13,14 @@ var PLACEHOLDER = '__lodash_placeholder__';
 function replaceHolders(array, placeholder) {
   var index = -1,
       length = array.length,
-      resIndex = -1,
+      resIndex = 0,
       result = [];
 
   while (++index < length) {
     var value = array[index];
     if (value === placeholder || value === PLACEHOLDER) {
       array[index] = PLACEHOLDER;
-      result[++resIndex] = index;
+      result[resIndex++] = index;
     }
   }
   return result;
diff --git a/array.default.js b/array.default.js
index 15a60b909..608789c53 100644
--- a/array.default.js
+++ b/array.default.js
@@ -27,6 +27,7 @@ import lastIndexOf from './lastIndexOf';
 import pull from './pull';
 import pullAll from './pullAll';
 import pullAllBy from './pullAllBy';
+import pullAllWith from './pullAllWith';
 import pullAt from './pullAt';
 import remove from './remove';
 import reverse from './reverse';
@@ -67,12 +68,12 @@ export default {
   fill, findIndex, findLastIndex, flatten, flattenDeep,
   flattenDepth, fromPairs, head, indexOf, initial,
   intersection, intersectionBy, intersectionWith, join, last,
-  lastIndexOf, pull, pullAll, pullAllBy, pullAt,
-  remove, reverse, slice, sortedIndex, sortedIndexBy,
-  sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf, sortedUniq,
-  sortedUniqBy, tail, take, takeRight, takeRightWhile,
-  takeWhile, union, unionBy, unionWith, uniq,
-  uniqBy, uniqWith, unzip, unzipWith, without,
-  xor, xorBy, xorWith, zip, zipObject,
-  zipObjectDeep, zipWith
+  lastIndexOf, pull, pullAll, pullAllBy, pullAllWith,
+  pullAt, remove, reverse, slice, sortedIndex,
+  sortedIndexBy, sortedIndexOf, sortedLastIndex, sortedLastIndexBy, sortedLastIndexOf,
+  sortedUniq, sortedUniqBy, tail, take, takeRight,
+  takeRightWhile, takeWhile, union, unionBy, unionWith,
+  uniq, uniqBy, uniqWith, unzip, unzipWith,
+  without, xor, xorBy, xorWith, zip,
+  zipObject, zipObjectDeep, zipWith
 };
diff --git a/array.js b/array.js
index f6e6fb2a3..753314615 100644
--- a/array.js
+++ b/array.js
@@ -27,6 +27,7 @@ export { default as lastIndexOf } from './lastIndexOf';
 export { default as pull } from './pull';
 export { default as pullAll } from './pullAll';
 export { default as pullAllBy } from './pullAllBy';
+export { default as pullAllWith } from './pullAllWith';
 export { default as pullAt } from './pullAt';
 export { default as remove } from './remove';
 export { default as reverse } from './reverse';
diff --git a/assign.js b/assign.js
index c13a41deb..d4a4fd780 100644
--- a/assign.js
+++ b/assign.js
@@ -1,7 +1,19 @@
+import assignValue from './_assignValue';
 import copyObject from './_copyObject';
 import createAssigner from './_createAssigner';
+import isArrayLike from './isArrayLike';
+import isPrototype from './_isPrototype';
 import keys from './keys';
 
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
+var nonEnumShadows = !({ 'valueOf': 1 }).propertyIsEnumerable('valueOf');
+
 /**
  * Assigns own enumerable properties of source objects to the destination
  * object. Source objects are applied from left to right. Subsequent sources
@@ -33,7 +45,15 @@ import keys from './keys';
  * // => { 'a': 1, 'c': 3, 'e': 5 }
  */
 var assign = createAssigner(function(object, source) {
-  copyObject(source, keys(source), object);
+  if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
+    copyObject(source, keys(source), object);
+    return;
+  }
+  for (var key in source) {
+    if (hasOwnProperty.call(source, key)) {
+      assignValue(object, key, source[key]);
+    }
+  }
 });
 
 export default assign;
diff --git a/assignIn.js b/assignIn.js
index eb281b15f..317187873 100644
--- a/assignIn.js
+++ b/assignIn.js
@@ -1,7 +1,13 @@
+import assignValue from './_assignValue';
 import copyObject from './_copyObject';
 import createAssigner from './_createAssigner';
+import isArrayLike from './isArrayLike';
+import isPrototype from './_isPrototype';
 import keysIn from './keysIn';
 
+/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */
+var nonEnumShadows = !({ 'valueOf': 1 }).propertyIsEnumerable('valueOf');
+
 /**
  * This method is like `_.assign` except that it iterates over own and
  * inherited source properties.
@@ -32,7 +38,13 @@ import keysIn from './keysIn';
  * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }
  */
 var assignIn = createAssigner(function(object, source) {
-  copyObject(source, keysIn(source), object);
+  if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {
+    copyObject(source, keysIn(source), object);
+    return;
+  }
+  for (var key in source) {
+    assignValue(object, key, source[key]);
+  }
 });
 
 export default assignIn;
diff --git a/chunk.js b/chunk.js
index 0c69eb333..11328e24f 100644
--- a/chunk.js
+++ b/chunk.js
@@ -32,11 +32,11 @@ function chunk(array, size) {
     return [];
   }
   var index = 0,
-      resIndex = -1,
+      resIndex = 0,
       result = Array(nativeCeil(length / size));
 
   while (index < length) {
-    result[++resIndex] = baseSlice(array, index, (index += size));
+    result[resIndex++] = baseSlice(array, index, (index += size));
   }
   return result;
 }
diff --git a/compact.js b/compact.js
index 438719a21..8abb94333 100644
--- a/compact.js
+++ b/compact.js
@@ -15,13 +15,13 @@
 function compact(array) {
   var index = -1,
       length = array ? array.length : 0,
-      resIndex = -1,
+      resIndex = 0,
       result = [];
 
   while (++index < length) {
     var value = array[index];
     if (value) {
-      result[++resIndex] = value;
+      result[resIndex++] = value;
     }
   }
   return result;
diff --git a/difference.js b/difference.js
index eb2e283d6..27d9ef8f6 100644
--- a/difference.js
+++ b/difference.js
@@ -6,7 +6,8 @@ import rest from './rest';
 /**
  * Creates an array of unique `array` values not included in the other
  * given arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
- * for equality comparisons.
+ * for equality comparisons. The order of result values is determined by the
+ * order they occur in the first array.
  *
  * @static
  * @memberOf _
diff --git a/differenceBy.js b/differenceBy.js
index cec8d0327..844a14faf 100644
--- a/differenceBy.js
+++ b/differenceBy.js
@@ -8,7 +8,8 @@ import rest from './rest';
 /**
  * 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 uniqueness is computed. The iteratee is invoked with one argument: (value).
+ * by which they're compared. Result values are chosen from the first array.
+ * The iteratee is invoked with one argument: (value).
  *
  * @static
  * @memberOf _
diff --git a/differenceWith.js b/differenceWith.js
index e2f13959a..5ef96657e 100644
--- a/differenceWith.js
+++ b/differenceWith.js
@@ -6,8 +6,9 @@ import rest from './rest';
 
 /**
  * This method is like `_.difference` except that it accepts `comparator`
- * which is invoked to compare elements of `array` to `values`. The comparator
- * is invoked with two arguments: (arrVal, othVal).
+ * 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).
  *
  * @static
  * @memberOf _
diff --git a/intersection.js b/intersection.js
index 60b3a0913..64591b110 100644
--- a/intersection.js
+++ b/intersection.js
@@ -6,13 +6,14 @@ import rest from './rest';
 /**
  * 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.
+ * for equality comparisons. The order of result values is determined by the
+ * order they occur in the first array.
  *
  * @static
  * @memberOf _
  * @category Array
  * @param {...Array} [arrays] The arrays to inspect.
- * @returns {Array} Returns the new array of shared values.
+ * @returns {Array} Returns the new array of intersecting values.
  * @example
  *
  * _.intersection([2, 1], [4, 2], [1, 2]);
diff --git a/intersectionBy.js b/intersectionBy.js
index 880668abb..49dfeb518 100644
--- a/intersectionBy.js
+++ b/intersectionBy.js
@@ -8,14 +8,15 @@ import rest from './rest';
 /**
  * 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 uniqueness is computed. The iteratee is invoked with one argument: (value).
+ * by which they're compared. Result values are chosen from the first array.
+ * The iteratee is invoked with one argument: (value).
  *
  * @static
  * @memberOf _
  * @category Array
  * @param {...Array} [arrays] The arrays to inspect.
  * @param {Function|Object|string} [iteratee=_.identity] The iteratee invoked per element.
- * @returns {Array} Returns the new array of shared values.
+ * @returns {Array} Returns the new array of intersecting values.
  * @example
  *
  * _.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor);
diff --git a/intersectionWith.js b/intersectionWith.js
index 59d5ff1ac..8d14ecb80 100644
--- a/intersectionWith.js
+++ b/intersectionWith.js
@@ -6,15 +6,16 @@ import rest from './rest';
 
 /**
  * This method is like `_.intersection` except that it accepts `comparator`
- * which is invoked to compare elements of `arrays`. The comparator is invoked
- * with two arguments: (arrVal, othVal).
+ * 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).
  *
  * @static
  * @memberOf _
  * @category Array
  * @param {...Array} [arrays] The arrays to inspect.
  * @param {Function} [comparator] The comparator invoked per element.
- * @returns {Array} Returns the new array of shared values.
+ * @returns {Array} Returns the new array of intersecting values.
  * @example
  *
  * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
diff --git a/isArrayLike.js b/isArrayLike.js
index cf64b36d8..6c70e2375 100644
--- a/isArrayLike.js
+++ b/isArrayLike.js
@@ -27,8 +27,7 @@ import isLength from './isLength';
  * // => false
  */
 function isArrayLike(value) {
-  return value != null &&
-    !(typeof value == 'function' && isFunction(value)) && isLength(getLength(value));
+  return value != null && isLength(getLength(value)) && !isFunction(value);
 }
 
 export default isArrayLike;
diff --git a/isEmpty.js b/isEmpty.js
index b12758a1c..9c35eff8c 100644
--- a/isEmpty.js
+++ b/isEmpty.js
@@ -11,14 +11,14 @@ var objectProto = Object.prototype;
 var hasOwnProperty = objectProto.hasOwnProperty;
 
 /**
- * Checks if `value` is empty. A value is considered empty unless it's an
- * `arguments` object, array, string, or jQuery-like collection with a length
- * greater than `0` or an object with own enumerable properties.
+ * Checks if `value` is an empty collection or object. A value is considered
+ * empty if it's an `arguments` object, array, string, or jQuery-like collection
+ * with a length of `0` or has no own enumerable properties.
  *
  * @static
  * @memberOf _
  * @category Lang
- * @param {Array|Object|string} value The value to inspect.
+ * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is empty, else `false`.
  * @example
  *
diff --git a/isFunction.js b/isFunction.js
index 5e2e6b609..c66ff49f0 100644
--- a/isFunction.js
+++ b/isFunction.js
@@ -31,8 +31,8 @@ var objectToString = objectProto.toString;
  */
 function isFunction(value) {
   // The use of `Object#toString` avoids issues with the `typeof` operator
-  // in Safari 8 which returns 'object' for typed array constructors, and
-  // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+  // in Safari 8 which returns 'object' for typed array and weak map constructors,
+  // and PhantomJS 1.9 which returns 'function' for `NodeList` instances.
   var tag = isObject(value) ? objectToString.call(value) : '';
   return tag == funcTag || tag == genTag;
 }
diff --git a/lodash.default.js b/lodash.default.js
index d8b4684a6..3a74287f2 100644
--- a/lodash.default.js
+++ b/lodash.default.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.5.1 (Custom Build) <https://lodash.com/>
+ * lodash 4.6.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="es" -o ./`
  * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -44,7 +44,7 @@ import toInteger from './toInteger';
 import lodash from './wrapperLodash';
 
 /** Used as the semantic version number. */
-var VERSION = '4.5.1';
+var VERSION = '4.6.0';
 
 /** Used to compose bitmasks for wrapper metadata. */
 var BIND_KEY_FLAG = 2;
@@ -179,6 +179,7 @@ lodash.propertyOf = util.propertyOf;
 lodash.pull = array.pull;
 lodash.pullAll = array.pullAll;
 lodash.pullAllBy = array.pullAllBy;
+lodash.pullAllWith = array.pullAllWith;
 lodash.pullAt = array.pullAt;
 lodash.range = util.range;
 lodash.rangeRight = util.rangeRight;
@@ -221,6 +222,8 @@ lodash.uniqWith = array.uniqWith;
 lodash.unset = object.unset;
 lodash.unzip = array.unzip;
 lodash.unzipWith = array.unzipWith;
+lodash.update = object.update;
+lodash.updateWith = object.updateWith;
 lodash.values = object.values;
 lodash.valuesIn = object.valuesIn;
 lodash.without = array.without;
diff --git a/lodash.js b/lodash.js
index b493d24cf..7cfb2fb00 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.5.1 (Custom Build) <https://lodash.com/>
+ * lodash 4.6.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="es" -o ./`
  * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
@@ -201,6 +201,7 @@ export { default as propertyOf } from './propertyOf';
 export { default as pull } from './pull';
 export { default as pullAll } from './pullAll';
 export { default as pullAllBy } from './pullAllBy';
+export { default as pullAllWith } from './pullAllWith';
 export { default as pullAt } from './pullAt';
 export { default as random } from './random';
 export { default as range } from './range';
@@ -283,6 +284,8 @@ export { default as uniqueId } from './uniqueId';
 export { default as unset } from './unset';
 export { default as unzip } from './unzip';
 export { default as unzipWith } from './unzipWith';
+export { default as update } from './update';
+export { default as updateWith } from './updateWith';
 export { default as upperCase } from './upperCase';
 export { default as upperFirst } from './upperFirst';
 export { default as value } from './value';
diff --git a/merge.js b/merge.js
index a00334f92..0368b8f87 100644
--- a/merge.js
+++ b/merge.js
@@ -2,12 +2,13 @@ import baseMerge from './_baseMerge';
 import createAssigner from './_createAssigner';
 
 /**
- * Recursively merges own and inherited enumerable properties of source objects
- * into the destination object. Source properties that resolve to `undefined`
- * are skipped if a destination value exists. Array and plain object properties
- * are merged recursively. Other objects and value types are overridden by
- * assignment. Source objects are applied from left to right. Subsequent
- * sources overwrite property assignments of previous sources.
+ * This method is like `_.assign` except that it recursively merges own and
+ * inherited enumerable properties of source objects into the destination
+ * object. Source properties that resolve to `undefined` are skipped if a
+ * destination value exists. Array and plain object properties are merged
+ * recursively.Other objects and value types are overridden by assignment.
+ * Source objects are applied from left to right. Subsequent sources
+ * overwrite property assignments of previous sources.
  *
  * **Note:** This method mutates `object`.
  *
diff --git a/object.default.js b/object.default.js
index 30ef1a8fb..d87236cd2 100644
--- a/object.default.js
+++ b/object.default.js
@@ -38,6 +38,8 @@ import toPairs from './toPairs';
 import toPairsIn from './toPairsIn';
 import transform from './transform';
 import unset from './unset';
+import update from './update';
+import updateWith from './updateWith';
 import values from './values';
 import valuesIn from './valuesIn';
 
@@ -50,5 +52,5 @@ export default {
   mapKeys, mapValues, merge, mergeWith, omit,
   omitBy, pick, pickBy, result, set,
   setWith, toPairs, toPairsIn, transform, unset,
-  values, valuesIn
+  update, updateWith, values, valuesIn
 };
diff --git a/object.js b/object.js
index 8826ba4fb..d49b04b6d 100644
--- a/object.js
+++ b/object.js
@@ -38,6 +38,8 @@ export { default as toPairs } from './toPairs';
 export { default as toPairsIn } from './toPairsIn';
 export { default as transform } from './transform';
 export { default as unset } from './unset';
+export { default as update } from './update';
+export { default as updateWith } from './updateWith';
 export { default as values } from './values';
 export { default as valuesIn } from './valuesIn';
 export { default as default } from './object.default';
diff --git a/package.json b/package.json
index 59f926e0f..441c14eb8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash-es",
-  "version": "4.5.1",
+  "version": "4.6.0",
   "description": "Lodash exported as ES modules.",
   "homepage": "https://lodash.com/custom-builds",
   "license": "MIT",
diff --git a/pullAllBy.js b/pullAllBy.js
index 585c8a543..e649aef41 100644
--- a/pullAllBy.js
+++ b/pullAllBy.js
@@ -1,10 +1,10 @@
 import baseIteratee from './_baseIteratee';
-import basePullAllBy from './_basePullAllBy';
+import basePullAll from './_basePullAll';
 
 /**
  * This method is like `_.pullAll` except that it accepts `iteratee` which is
  * invoked for each element of `array` and `values` to generate the criterion
- * by which uniqueness is computed. The iteratee is invoked with one argument: (value).
+ * by which they're compared. The iteratee is invoked with one argument: (value).
  *
  * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
  *
@@ -25,7 +25,7 @@ import basePullAllBy from './_basePullAllBy';
  */
 function pullAllBy(array, values, iteratee) {
   return (array && array.length && values && values.length)
-    ? basePullAllBy(array, values, baseIteratee(iteratee))
+    ? basePullAll(array, values, baseIteratee(iteratee))
     : array;
 }
 
diff --git a/pullAllWith.js b/pullAllWith.js
new file mode 100644
index 000000000..dd2d6d3e8
--- /dev/null
+++ b/pullAllWith.js
@@ -0,0 +1,31 @@
+import basePullAll from './_basePullAll';
+
+/**
+ * This method is like `_.pullAll` except that it accepts `comparator` which
+ * is invoked to compare elements of `array` to `values`. The comparator is
+ * invoked with two arguments: (arrVal, othVal).
+ *
+ * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to modify.
+ * @param {Array} values The values to remove.
+ * @param {Function} [comparator] The comparator invoked per element.
+ * @returns {Array} Returns `array`.
+ * @example
+ *
+ * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
+ *
+ * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
+ * console.log(array);
+ * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
+ */
+function pullAllWith(array, values, comparator) {
+  return (array && array.length && values && values.length)
+    ? basePullAll(array, values, undefined, comparator)
+    : array;
+}
+
+export default pullAllWith;
diff --git a/setWith.js b/setWith.js
index 880d64c6a..1baaa6e06 100644
--- a/setWith.js
+++ b/setWith.js
@@ -18,8 +18,10 @@ import baseSet from './_baseSet';
  * @returns {Object} Returns `object`.
  * @example
  *
- * _.setWith({ '0': { 'length': 2 } }, '[0][1][2]', 3, Object);
- * // => { '0': { '1': { '2': 3 }, 'length': 2 } }
+ * var object = {};
+ *
+ * _.setWith(object, '[0][1]', 'a', Object);
+ * // => { '0': { '1': 'a' } }
  */
 function setWith(object, path, value, customizer) {
   customizer = typeof customizer == 'function' ? customizer : undefined;
diff --git a/toLower.js b/toLower.js
index 4a8b452cf..c3e7270be 100644
--- a/toLower.js
+++ b/toLower.js
@@ -1,7 +1,8 @@
 import toString from './toString';
 
 /**
- * Converts `string`, as a whole, to lower case.
+ * Converts `string`, as a whole, to lower case just like
+ * [String#toLowerCase](https://mdn.io/toLowerCase).
  *
  * @static
  * @memberOf _
diff --git a/toString.js b/toString.js
index e1af8b2be..0e289b708 100644
--- a/toString.js
+++ b/toString.js
@@ -6,7 +6,7 @@ var INFINITY = 1 / 0;
 
 /** Used to convert symbols to primitives and strings. */
 var symbolProto = Symbol ? Symbol.prototype : undefined,
-    symbolToString = Symbol ? symbolProto.toString : undefined;
+    symbolToString = symbolProto ? symbolProto.toString : undefined;
 
 /**
  * Converts `value` to a string if it's not one. An empty string is returned
@@ -37,7 +37,7 @@ function toString(value) {
     return '';
   }
   if (isSymbol(value)) {
-    return Symbol ? symbolToString.call(value) : '';
+    return symbolToString ? symbolToString.call(value) : '';
   }
   var result = (value + '');
   return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
diff --git a/toUpper.js b/toUpper.js
index b1da10938..d06e55a21 100644
--- a/toUpper.js
+++ b/toUpper.js
@@ -1,7 +1,8 @@
 import toString from './toString';
 
 /**
- * Converts `string`, as a whole, to upper case.
+ * Converts `string`, as a whole, to upper case just like
+ * [String#toUpperCase](https://mdn.io/toUpperCase).
  *
  * @static
  * @memberOf _
diff --git a/update.js b/update.js
new file mode 100644
index 000000000..8a6a22727
--- /dev/null
+++ b/update.js
@@ -0,0 +1,34 @@
+import baseCastFunction from './_baseCastFunction';
+import baseUpdate from './_baseUpdate';
+
+/**
+ * This method is like `_.set` except that accepts `updater` to produce the
+ * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
+ * is invoked with one argument: (value).
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {Function} updater The function to produce the updated value.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ *
+ * _.update(object, 'a[0].b.c', function(n) { return n * n; });
+ * console.log(object.a[0].b.c);
+ * // => 9
+ *
+ * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
+ * console.log(object.x[0].y.z);
+ * // => 0
+ */
+function update(object, path, updater) {
+  return object == null ? object : baseUpdate(object, path, baseCastFunction(updater));
+}
+
+export default update;
diff --git a/updateWith.js b/updateWith.js
new file mode 100644
index 000000000..0a9930fce
--- /dev/null
+++ b/updateWith.js
@@ -0,0 +1,32 @@
+import baseCastFunction from './_baseCastFunction';
+import baseUpdate from './_baseUpdate';
+
+/**
+ * This method is like `_.update` except that it accepts `customizer` which is
+ * invoked to produce the objects of `path`.  If `customizer` returns `undefined`
+ * path creation is handled by the method instead. The `customizer` is invoked
+ * with three arguments: (nsValue, key, nsObject).
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Object
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The path of the property to set.
+ * @param {Function} updater The function to produce the updated value.
+ * @param {Function} [customizer] The function to customize assigned values.
+ * @returns {Object} Returns `object`.
+ * @example
+ *
+ * var object = {};
+ *
+ * _.updateWith(object, '[0][1]', _.constant('a'), Object);
+ * // => { '0': { '1': 'a' } }
+ */
+function updateWith(object, path, updater, customizer) {
+  customizer = typeof customizer == 'function' ? customizer : undefined;
+  return object == null ? object : baseUpdate(object, path, baseCastFunction(updater), customizer);
+}
+
+export default updateWith;
diff --git a/wrapperLodash.js b/wrapperLodash.js
index 6761677df..8bab5c782 100644
--- a/wrapperLodash.js
+++ b/wrapperLodash.js
@@ -53,46 +53,48 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
  * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
  * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
- * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`, `difference`,
- * `differenceBy`, `differenceWith`, `drop`, `dropRight`, `dropRightWhile`,
- * `dropWhile`, `fill`, `filter`, `flatten`, `flattenDeep`, `flattenDepth`,
- * `flip`, `flow`, `flowRight`, `fromPairs`, `functions`, `functionsIn`,
- * `groupBy`, `initial`, `intersection`, `intersectionBy`, `intersectionWith`,
- * `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`, `keys`, `keysIn`,
- * `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`, `memoize`,
- * `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`, `nthArg`,
- * `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`, `overEvery`,
- * `overSome`, `partial`, `partialRight`, `partition`, `pick`, `pickBy`, `plant`,
- * `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`, `pullAt`, `push`,
- * `range`, `rangeRight`, `rearg`, `reject`, `remove`, `rest`, `reverse`,
- * `sampleSize`, `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`,
- * `splice`, `spread`, `tail`, `take`, `takeRight`, `takeRightWhile`,
- * `takeWhile`, `tap`, `throttle`, `thru`, `toArray`, `toPairs`, `toPairsIn`,
- * `toPath`, `toPlainObject`, `transform`, `unary`, `union`, `unionBy`,
- * `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`, `unshift`, `unzip`,
- * `unzipWith`, `values`, `valuesIn`, `without`, `wrap`, `xor`, `xorBy`,
- * `xorWith`, `zip`, `zipObject`, `zipObjectDeep`, and `zipWith`
+ * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
+ * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
+ * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
+ * `flatten`, `flattenDeep`, `flattenDepth`, `flip`, `flow`, `flowRight`,
+ * `fromPairs`, `functions`, `functionsIn`, `groupBy`, `initial`, `intersection`,
+ * `intersectionBy`, `intersectionWith`, `invert`, `invertBy`, `invokeMap`,
+ * `iteratee`, `keyBy`, `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`,
+ * `matches`, `matchesProperty`, `memoize`, `merge`, `mergeWith`, `method`,
+ * `methodOf`, `mixin`, `negate`, `nthArg`, `omit`, `omitBy`, `once`, `orderBy`,
+ * `over`, `overArgs`, `overEvery`, `overSome`, `partial`, `partialRight`,
+ * `partition`, `pick`, `pickBy`, `plant`, `property`, `propertyOf`, `pull`,
+ * `pullAll`, `pullAllBy`, `pullAllWith`, `pullAt`, `push`, `range`,
+ * `rangeRight`, `rearg`, `reject`, `remove`, `rest`, `reverse`, `sampleSize`,
+ * `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`, `spread`,
+ * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, `tap`, `throttle`,
+ * `thru`, `toArray`, `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`,
+ * `transform`, `unary`, `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`,
+ * `uniqWith`, `unset`, `unshift`, `unzip`, `unzipWith`, `update`, `values`,
+ * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`, `zipObject`,
+ * `zipObjectDeep`, and `zipWith`
  *
  * The wrapper methods that are **not** chainable by default are:
  * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
- * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `deburr`, `endsWith`, `eq`,
- * `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
- * `findLastIndex`, `findLastKey`, `floor`, `forEach`, `forEachRight`, `forIn`,
- * `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`, `hasIn`,
- * `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`, `isArguments`,
- * `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`, `isBoolean`,
- * `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`, `isEqualWith`,
- * `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`, `isMap`,
- * `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`, `isNumber`,
- * `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`, `isSafeInteger`,
- * `isSet`, `isString`, `isUndefined`, `isTypedArray`, `isWeakMap`, `isWeakSet`,
- * `join`, `kebabCase`, `last`, `lastIndexOf`, `lowerCase`, `lowerFirst`,
- * `lt`, `lte`, `max`, `maxBy`, `mean`, `min`, `minBy`, `noConflict`, `noop`,
- * `now`, `pad`, `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`,
- * `reduceRight`, `repeat`, `result`, `round`, `runInContext`, `sample`,
- * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`,
- * `sortedLastIndex`, `sortedLastIndexBy`, `startCase`, `startsWith`, `subtract`,
- * `sum`, `sumBy`, `template`, `times`, `toLower`, `toInteger`, `toLength`,
+ * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `deburr`, `each`, `eachRight`,
+ * `endsWith`, `eq`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`,
+ * `findKey`, `findLast`, `findLastIndex`, `findLastKey`, `first`, `floor`,
+ * `forEach`, `forEachRight`, `forIn`, `forInRight`, `forOwn`, `forOwnRight`,
+ * `get`, `gt`, `gte`, `has`, `hasIn`, `head`, `identity`, `includes`,
+ * `indexOf`, `inRange`, `invoke`, `isArguments`, `isArray`, `isArrayBuffer`,
+ * `isArrayLike`, `isArrayLikeObject`, `isBoolean`, `isBuffer`, `isDate`,
+ * `isElement`, `isEmpty`, `isEqual`, `isEqualWith`, `isError`, `isFinite`,
+ * `isFunction`, `isInteger`, `isLength`, `isMap`, `isMatch`, `isMatchWith`,
+ * `isNaN`, `isNative`, `isNil`, `isNull`, `isNumber`, `isObject`, `isObjectLike`,
+ * `isPlainObject`, `isRegExp`, `isSafeInteger`, `isSet`, `isString`,
+ * `isUndefined`, `isTypedArray`, `isWeakMap`, `isWeakSet`, `join`, `kebabCase`,
+ * `last`, `lastIndexOf`, `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`,
+ * `maxBy`, `mean`, `min`, `minBy`, `noConflict`, `noop`, `now`, `pad`,
+ * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
+ * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
+ * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
+ * `sortedLastIndexBy`, `startCase`, `startsWith`, `subtract`, `sum`, `sumBy`,
+ * `template`, `times`, `toInteger`, `toJSON`, `toLength`, `toLower`,
  * `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`, `trimEnd`,
  * `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`, `upperFirst`,
  * `value`, and `words`
@@ -137,5 +139,6 @@ function lodash(value) {
 
 // Ensure wrappers are instances of `baseLodash`.
 lodash.prototype = baseLodash.prototype;
+lodash.prototype.constructor = lodash;
 
 export default lodash;
diff --git a/xor.js b/xor.js
index 0a5b97458..f89eea0eb 100644
--- a/xor.js
+++ b/xor.js
@@ -5,7 +5,8 @@ import rest from './rest';
 
 /**
  * Creates an array of unique values that is the [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
- * of the given arrays.
+ * of the given arrays. The order of result values is determined by the order
+ * they occur in the arrays.
  *
  * @static
  * @memberOf _
diff --git a/xorBy.js b/xorBy.js
index dfdb4ef52..c30ab224d 100644
--- a/xorBy.js
+++ b/xorBy.js
@@ -8,7 +8,7 @@ import rest from './rest';
 /**
  * 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
- * uniqueness is computed. The iteratee is invoked with one argument: (value).
+ * by which they're compared. The iteratee is invoked with one argument: (value).
  *
  * @static
  * @memberOf _