diff --git a/README.md b/README.md
index 402a960b6..23d4ddd11 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# lodash-es v4.3.0
+# lodash-es v4.4.0
 
 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/4.3.0-es) for more details.
+See the [package source](https://github.com/lodash/lodash/tree/4.4.0-es) for more details.
diff --git a/_Hash.js b/_Hash.js
index 73c741b58..0848848de 100644
--- a/_Hash.js
+++ b/_Hash.js
@@ -7,6 +7,7 @@ var objectProto = Object.prototype;
  * Creates an hash object.
  *
  * @private
+ * @constructor
  * @returns {Object} Returns the new hash object.
  */
 function Hash() {}
diff --git a/_LazyWrapper.js b/_LazyWrapper.js
index 95a49dbd5..9a4a2ad50 100644
--- a/_LazyWrapper.js
+++ b/_LazyWrapper.js
@@ -8,6 +8,7 @@ var MAX_ARRAY_LENGTH = 4294967295;
  * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
  *
  * @private
+ * @constructor
  * @param {*} value The value to wrap.
  */
 function LazyWrapper(value) {
diff --git a/_MapCache.js b/_MapCache.js
index a0d716575..3ca6da713 100644
--- a/_MapCache.js
+++ b/_MapCache.js
@@ -8,6 +8,7 @@ import mapSet from './_mapSet';
  * Creates a map cache object to store key-value pairs.
  *
  * @private
+ * @constructor
  * @param {Array} [values] The values to cache.
  */
 function MapCache(values) {
diff --git a/_SetCache.js b/_SetCache.js
index 30b2ebd1d..616f7c036 100644
--- a/_SetCache.js
+++ b/_SetCache.js
@@ -6,6 +6,7 @@ import cachePush from './_cachePush';
  * Creates a set cache object to store unique values.
  *
  * @private
+ * @constructor
  * @param {Array} [values] The values to cache.
  */
 function SetCache(values) {
diff --git a/_Stack.js b/_Stack.js
index cb06511b8..50b7ebb56 100644
--- a/_Stack.js
+++ b/_Stack.js
@@ -8,6 +8,7 @@ import stackSet from './_stackSet';
  * Creates a stack cache object to store key-value pairs.
  *
  * @private
+ * @constructor
  * @param {Array} [values] The values to cache.
  */
 function Stack(values) {
diff --git a/_baseCastArrayLikeObject.js b/_baseCastArrayLikeObject.js
new file mode 100644
index 000000000..3c139b2bb
--- /dev/null
+++ b/_baseCastArrayLikeObject.js
@@ -0,0 +1,14 @@
+import isArrayLikeObject from './isArrayLikeObject';
+
+/**
+ * Casts `value` to an empty array if it's not an array like object.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the array-like object.
+ */
+function baseCastArrayLikeObject(value) {
+  return isArrayLikeObject(value) ? value : [];
+}
+
+export default baseCastArrayLikeObject;
diff --git a/_baseCastFunction.js b/_baseCastFunction.js
new file mode 100644
index 000000000..dfa272ecc
--- /dev/null
+++ b/_baseCastFunction.js
@@ -0,0 +1,14 @@
+import identity from './identity';
+
+/**
+ * Casts `value` to `identity` if it's not a function.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the array-like object.
+ */
+function baseCastFunction(value) {
+  return typeof value == 'function' ? value : identity;
+}
+
+export default baseCastFunction;
diff --git a/_baseCastPath.js b/_baseCastPath.js
new file mode 100644
index 000000000..41c7ecdd6
--- /dev/null
+++ b/_baseCastPath.js
@@ -0,0 +1,15 @@
+import isArray from './isArray';
+import stringToPath from './_stringToPath';
+
+/**
+ * Casts `value` to a path array if it's not one.
+ *
+ * @private
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the cast property path array.
+ */
+function baseCastPath(value) {
+  return isArray(value) ? value : stringToPath(value);
+}
+
+export default baseCastPath;
diff --git a/_baseCreate.js b/_baseCreate.js
index 98c576034..95945bbb7 100644
--- a/_baseCreate.js
+++ b/_baseCreate.js
@@ -1,5 +1,8 @@
 import isObject from './isObject';
 
+/** Built-in value references. */
+var objectCreate = Object.create;
+
 /**
  * The base implementation of `_.create` without support for assigning
  * properties to the created object.
@@ -8,16 +11,8 @@ import isObject from './isObject';
  * @param {Object} prototype The object to inherit from.
  * @returns {Object} Returns the new object.
  */
-var baseCreate = (function() {
-  function object() {}
-  return function(prototype) {
-    if (isObject(prototype)) {
-      object.prototype = prototype;
-      var result = new object;
-      object.prototype = undefined;
-    }
-    return result || {};
-  };
-}());
+function baseCreate(proto) {
+  return isObject(proto) ? objectCreate(proto) : {};
+}
 
 export default baseCreate;
diff --git a/_baseFlatten.js b/_baseFlatten.js
index d668ae5b4..f9ea40749 100644
--- a/_baseFlatten.js
+++ b/_baseFlatten.js
@@ -8,12 +8,12 @@ import isArrayLikeObject from './isArrayLikeObject';
  *
  * @private
  * @param {Array} array The array to flatten.
- * @param {boolean} [isDeep] Specify a deep flatten.
+ * @param {number} depth The maximum recursion depth.
  * @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
  * @param {Array} [result=[]] The initial result value.
  * @returns {Array} Returns the new flattened array.
  */
-function baseFlatten(array, isDeep, isStrict, result) {
+function baseFlatten(array, depth, isStrict, result) {
   result || (result = []);
 
   var index = -1,
@@ -21,11 +21,11 @@ function baseFlatten(array, isDeep, isStrict, result) {
 
   while (++index < length) {
     var value = array[index];
-    if (isArrayLikeObject(value) &&
+    if (depth > 0 && isArrayLikeObject(value) &&
         (isStrict || isArray(value) || isArguments(value))) {
-      if (isDeep) {
+      if (depth > 1) {
         // Recursively flatten arrays (susceptible to call stack limits).
-        baseFlatten(value, isDeep, isStrict, result);
+        baseFlatten(value, depth - 1, isStrict, result);
       } else {
         arrayPush(result, value);
       }
diff --git a/_baseGet.js b/_baseGet.js
index e64234fbf..93383ecfd 100644
--- a/_baseGet.js
+++ b/_baseGet.js
@@ -1,4 +1,4 @@
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import isKey from './_isKey';
 
 /**
@@ -10,7 +10,7 @@ import isKey from './_isKey';
  * @returns {*} Returns the resolved value.
  */
 function baseGet(object, path) {
-  path = isKey(path, object) ? [path + ''] : baseToPath(path);
+  path = isKey(path, object) ? [path + ''] : baseCastPath(path);
 
   var index = 0,
       length = path.length;
diff --git a/_baseIntersection.js b/_baseIntersection.js
index d5a3ded07..1a20c3437 100644
--- a/_baseIntersection.js
+++ b/_baseIntersection.js
@@ -42,11 +42,17 @@ function baseIntersection(arrays, iteratee, comparator) {
     var value = array[index],
         computed = iteratee ? iteratee(value) : value;
 
-    if (!(seen ? cacheHas(seen, computed) : includes(result, computed, comparator))) {
+    if (!(seen
+          ? cacheHas(seen, computed)
+          : includes(result, computed, comparator)
+        )) {
       var othIndex = othLength;
       while (--othIndex) {
         var cache = caches[othIndex];
-        if (!(cache ? cacheHas(cache, computed) : includes(arrays[othIndex], computed, comparator))) {
+        if (!(cache
+              ? cacheHas(cache, computed)
+              : includes(arrays[othIndex], computed, comparator))
+            ) {
           continue outer;
         }
       }
diff --git a/_baseInvoke.js b/_baseInvoke.js
index e64cca0d0..8ba20a268 100644
--- a/_baseInvoke.js
+++ b/_baseInvoke.js
@@ -1,5 +1,5 @@
 import apply from './_apply';
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import isKey from './_isKey';
 import last from './last';
 import parent from './_parent';
@@ -16,7 +16,7 @@ import parent from './_parent';
  */
 function baseInvoke(object, path, args) {
   if (!isKey(path, object)) {
-    path = baseToPath(path);
+    path = baseCastPath(path);
     object = parent(object, path);
     path = last(path);
   }
diff --git a/_baseKeys.js b/_baseKeys.js
index a683bc126..7e3b31eb6 100644
--- a/_baseKeys.js
+++ b/_baseKeys.js
@@ -6,7 +6,6 @@ var nativeKeys = Object.keys;
  * property of prototypes or treat sparse arrays as dense.
  *
  * @private
- * @type Function
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of property names.
  */
diff --git a/_baseMerge.js b/_baseMerge.js
index 388e059af..0869eacdd 100644
--- a/_baseMerge.js
+++ b/_baseMerge.js
@@ -21,7 +21,10 @@ function baseMerge(object, source, srcIndex, customizer, stack) {
   if (object === source) {
     return;
   }
-  var props = (isArray(source) || isTypedArray(source)) ? undefined : keysIn(source);
+  var props = (isArray(source) || isTypedArray(source))
+    ? undefined
+    : keysIn(source);
+
   arrayEach(props || source, function(srcValue, key) {
     if (props) {
       key = srcValue;
@@ -32,7 +35,10 @@ function baseMerge(object, source, srcIndex, customizer, stack) {
       baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
     }
     else {
-      var newValue = customizer ? customizer(object[key], srcValue, (key + ''), object, source, stack) : undefined;
+      var newValue = customizer
+        ? customizer(object[key], srcValue, (key + ''), object, source, stack)
+        : undefined;
+
       if (newValue === undefined) {
         newValue = srcValue;
       }
diff --git a/_baseMergeDeep.js b/_baseMergeDeep.js
index c1ad501fe..828330172 100644
--- a/_baseMergeDeep.js
+++ b/_baseMergeDeep.js
@@ -33,21 +33,24 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
     assignMergeValue(object, key, stacked);
     return;
   }
-  var newValue = customizer ? customizer(objValue, srcValue, (key + ''), object, source, stack) : undefined,
-      isCommon = newValue === undefined;
+  var newValue = customizer
+    ? customizer(objValue, srcValue, (key + ''), object, source, stack)
+    : undefined;
+
+  var isCommon = newValue === undefined;
 
   if (isCommon) {
     newValue = srcValue;
     if (isArray(srcValue) || isTypedArray(srcValue)) {
       if (isArray(objValue)) {
-        newValue = srcIndex ? copyArray(objValue) : objValue;
+        newValue = objValue;
       }
       else if (isArrayLikeObject(objValue)) {
         newValue = copyArray(objValue);
       }
       else {
         isCommon = false;
-        newValue = baseClone(srcValue);
+        newValue = baseClone(srcValue, true);
       }
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
@@ -56,10 +59,10 @@ function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, sta
       }
       else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
         isCommon = false;
-        newValue = baseClone(srcValue);
+        newValue = baseClone(srcValue, true);
       }
       else {
-        newValue = srcIndex ? baseClone(objValue) : objValue;
+        newValue = objValue;
       }
     }
     else {
diff --git a/_basePullAt.js b/_basePullAt.js
index 8f50662bd..470afcbcc 100644
--- a/_basePullAt.js
+++ b/_basePullAt.js
@@ -1,4 +1,4 @@
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import isIndex from './_isIndex';
 import isKey from './_isKey';
 import last from './last';
@@ -31,7 +31,7 @@ function basePullAt(array, indexes) {
         splice.call(array, index, 1);
       }
       else if (!isKey(index, array)) {
-        var path = baseToPath(index),
+        var path = baseCastPath(index),
             object = parent(array, path);
 
         if (object != null) {
diff --git a/_baseSet.js b/_baseSet.js
index 6b04422e0..de4debfd3 100644
--- a/_baseSet.js
+++ b/_baseSet.js
@@ -1,5 +1,5 @@
 import assignValue from './_assignValue';
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import isIndex from './_isIndex';
 import isKey from './_isKey';
 import isObject from './isObject';
@@ -15,7 +15,7 @@ import isObject from './isObject';
  * @returns {Object} Returns `object`.
  */
 function baseSet(object, path, value, customizer) {
-  path = isKey(path, object) ? [path + ''] : baseToPath(path);
+  path = isKey(path, object) ? [path + ''] : baseCastPath(path);
 
   var index = -1,
       length = path.length,
@@ -30,7 +30,9 @@ function baseSet(object, path, value, customizer) {
         var objValue = nested[key];
         newValue = customizer ? customizer(objValue, key, nested) : undefined;
         if (newValue === undefined) {
-          newValue = objValue == null ? (isIndex(path[index + 1]) ? [] : {}) : objValue;
+          newValue = objValue == null
+            ? (isIndex(path[index + 1]) ? [] : {})
+            : objValue;
         }
       }
       assignValue(nested, key, newValue);
diff --git a/_baseToPath.js b/_baseToPath.js
deleted file mode 100644
index a7ccdd7b1..000000000
--- a/_baseToPath.js
+++ /dev/null
@@ -1,16 +0,0 @@
-import isArray from './isArray';
-import stringToPath from './_stringToPath';
-
-/**
- * The base implementation of `_.toPath` which only converts `value` to a
- * path if it's not one.
- *
- * @private
- * @param {*} value The value to process.
- * @returns {Array} Returns the property path array.
- */
-function baseToPath(value) {
-  return isArray(value) ? value : stringToPath(value);
-}
-
-export default baseToPath;
diff --git a/_baseUnset.js b/_baseUnset.js
index 5743c1188..6666c9c54 100644
--- a/_baseUnset.js
+++ b/_baseUnset.js
@@ -1,4 +1,4 @@
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import has from './has';
 import isKey from './_isKey';
 import last from './last';
@@ -13,7 +13,7 @@ import parent from './_parent';
  * @returns {boolean} Returns `true` if the property is deleted, else `false`.
  */
 function baseUnset(object, path) {
-  path = isKey(path, object) ? [path + ''] : baseToPath(path);
+  path = isKey(path, object) ? [path + ''] : baseCastPath(path);
   object = parent(object, path);
   var key = last(path);
   return (object != null && has(object, key)) ? delete object[key] : true;
diff --git a/_cloneTypedArray.js b/_cloneTypedArray.js
index 2fe9d7d6b..b1f8f6890 100644
--- a/_cloneTypedArray.js
+++ b/_cloneTypedArray.js
@@ -9,10 +9,11 @@ import cloneArrayBuffer from './_cloneArrayBuffer';
  * @returns {Object} Returns the cloned typed array.
  */
 function cloneTypedArray(typedArray, isDeep) {
-  var buffer = typedArray.buffer,
+  var arrayBuffer = typedArray.buffer,
+      buffer = isDeep ? cloneArrayBuffer(arrayBuffer) : arrayBuffer,
       Ctor = typedArray.constructor;
 
-  return new Ctor(isDeep ? cloneArrayBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
+  return new Ctor(buffer, typedArray.byteOffset, typedArray.length);
 }
 
 export default cloneTypedArray;
diff --git a/_copyObjectWith.js b/_copyObjectWith.js
index faf39e4a0..596505be6 100644
--- a/_copyObjectWith.js
+++ b/_copyObjectWith.js
@@ -18,8 +18,11 @@ function copyObjectWith(source, props, object, customizer) {
       length = props.length;
 
   while (++index < length) {
-    var key = props[index],
-        newValue = customizer ? customizer(object[key], source[key], key, object, source) : source[key];
+    var key = props[index];
+
+    var newValue = customizer
+      ? customizer(object[key], source[key], key, object, source)
+      : source[key];
 
     assignValue(object, key, newValue);
   }
diff --git a/_createAssigner.js b/_createAssigner.js
index 9efc8ed99..ef06868ea 100644
--- a/_createAssigner.js
+++ b/_createAssigner.js
@@ -15,7 +15,10 @@ function createAssigner(assigner) {
         customizer = length > 1 ? sources[length - 1] : undefined,
         guard = length > 2 ? sources[2] : undefined;
 
-    customizer = typeof customizer == 'function' ? (length--, customizer) : undefined;
+    customizer = typeof customizer == 'function'
+      ? (length--, customizer)
+      : undefined;
+
     if (guard && isIterateeCall(sources[0], sources[1], guard)) {
       customizer = length < 3 ? undefined : customizer;
       length = 1;
diff --git a/_createCaseFirst.js b/_createCaseFirst.js
index 68dbe741d..69684d3b8 100644
--- a/_createCaseFirst.js
+++ b/_createCaseFirst.js
@@ -24,8 +24,11 @@ function createCaseFirst(methodName) {
   return function(string) {
     string = toString(string);
 
-    var strSymbols = reHasComplexSymbol.test(string) ? stringToArray(string) : undefined,
-        chr = strSymbols ? strSymbols[0] : string.charAt(0),
+    var strSymbols = reHasComplexSymbol.test(string)
+      ? stringToArray(string)
+      : undefined;
+
+    var chr = strSymbols ? strSymbols[0] : string.charAt(0),
         trailing = strSymbols ? strSymbols.slice(1).join('') : string.slice(1);
 
     return chr[methodName]() + trailing;
diff --git a/_createFlow.js b/_createFlow.js
index 8f8765bbd..635c423db 100644
--- a/_createFlow.js
+++ b/_createFlow.js
@@ -27,7 +27,7 @@ var FUNC_ERROR_TEXT = 'Expected a function';
  */
 function createFlow(fromRight) {
   return rest(function(funcs) {
-    funcs = baseFlatten(funcs);
+    funcs = baseFlatten(funcs, 1);
 
     var length = funcs.length,
         index = length,
@@ -52,7 +52,10 @@ function createFlow(fromRight) {
       var funcName = getFuncName(func),
           data = funcName == 'wrapper' ? getData(func) : undefined;
 
-      if (data && isLaziable(data[0]) && data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) && !data[4].length && data[9] == 1) {
+      if (data && isLaziable(data[0]) &&
+            data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) &&
+            !data[4].length && data[9] == 1
+          ) {
         wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
       } else {
         wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func);
@@ -62,7 +65,8 @@ function createFlow(fromRight) {
       var args = arguments,
           value = args[0];
 
-      if (wrapper && args.length == 1 && isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
+      if (wrapper && args.length == 1 &&
+          isArray(value) && value.length >= LARGE_ARRAY_SIZE) {
         return wrapper.plant(value).value();
       }
       var index = 0,
diff --git a/_createHybridWrapper.js b/_createHybridWrapper.js
index b6be32937..c88c8e6c4 100644
--- a/_createHybridWrapper.js
+++ b/_createHybridWrapper.js
@@ -60,7 +60,10 @@ function createHybridWrapper(func, bitmask, thisArg, partials, holders, partials
 
       length -= argsHolders.length;
       if (length < arity) {
-        return createRecurryWrapper(func, bitmask, createHybridWrapper, placeholder, thisArg, args, argsHolders, argPos, ary, arity - length);
+        return createRecurryWrapper(
+          func, bitmask, createHybridWrapper, placeholder, thisArg, args,
+          argsHolders, argPos, ary, arity - length
+        );
       }
     }
     var thisBinding = isBind ? thisArg : this,
diff --git a/_createOver.js b/_createOver.js
index c177d6f08..c24b36cfe 100644
--- a/_createOver.js
+++ b/_createOver.js
@@ -13,7 +13,7 @@ import rest from './rest';
  */
 function createOver(arrayFunc) {
   return rest(function(iteratees) {
-    iteratees = arrayMap(baseFlatten(iteratees), baseIteratee);
+    iteratees = arrayMap(baseFlatten(iteratees, 1), baseIteratee);
     return rest(function(args) {
       var thisArg = this;
       return arrayFunc(iteratees, function(iteratee) {
diff --git a/_createRecurryWrapper.js b/_createRecurryWrapper.js
index 7a8d98a25..73e3b078d 100644
--- a/_createRecurryWrapper.js
+++ b/_createRecurryWrapper.js
@@ -40,9 +40,12 @@ function createRecurryWrapper(func, bitmask, wrapFunc, placeholder, thisArg, par
   if (!(bitmask & CURRY_BOUND_FLAG)) {
     bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
   }
-  var newData = [func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight, newHoldersRight, newArgPos, ary, arity],
-      result = wrapFunc.apply(undefined, newData);
+  var newData = [
+    func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight,
+    newHoldersRight, newArgPos, ary, arity
+  ];
 
+  var result = wrapFunc.apply(undefined, newData);
   if (isLaziable(func)) {
     setData(result, newData);
   }
diff --git a/_createWrapper.js b/_createWrapper.js
index 8db83b9ca..c15e68a4d 100644
--- a/_createWrapper.js
+++ b/_createWrapper.js
@@ -67,8 +67,12 @@ function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, a
 
     partials = holders = undefined;
   }
-  var data = isBindKey ? undefined : getData(func),
-      newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity];
+  var data = isBindKey ? undefined : getData(func);
+
+  var newData = [
+    func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
+    argPos, ary, arity
+  ];
 
   if (data) {
     mergeData(newData, data);
diff --git a/_hasPath.js b/_hasPath.js
index aeaee998a..66d8fa9f1 100644
--- a/_hasPath.js
+++ b/_hasPath.js
@@ -1,4 +1,4 @@
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import isArguments from './isArguments';
 import isArray from './isArray';
 import isIndex from './_isIndex';
@@ -23,7 +23,7 @@ function hasPath(object, path, hasFunc) {
   }
   var result = hasFunc(object, path);
   if (!result && !isKey(path)) {
-    path = baseToPath(path);
+    path = baseCastPath(path);
     object = parent(object, path);
     if (object != null) {
       path = last(path);
diff --git a/_isKeyable.js b/_isKeyable.js
index 972b86b62..c78cd2c74 100644
--- a/_isKeyable.js
+++ b/_isKeyable.js
@@ -8,7 +8,7 @@
 function isKeyable(value) {
   var type = typeof value;
   return type == 'number' || type == 'boolean' ||
-    (type == 'string' && value !== '__proto__') || value == null;
+    (type == 'string' && value != '__proto__') || value == null;
 }
 
 export default isKeyable;
diff --git a/_lazyValue.js b/_lazyValue.js
index b1dac437f..0fa97c62a 100644
--- a/_lazyValue.js
+++ b/_lazyValue.js
@@ -36,7 +36,8 @@ function lazyValue() {
       resIndex = 0,
       takeCount = nativeMin(length, this.__takeCount__);
 
-  if (!isArr || arrLength < LARGE_ARRAY_SIZE || (arrLength == length && takeCount == length)) {
+  if (!isArr || arrLength < LARGE_ARRAY_SIZE ||
+      (arrLength == length && takeCount == length)) {
     return baseWrapperValue(array, this.__actions__);
   }
   var result = [];
diff --git a/_mapClear.js b/_mapClear.js
index a805ef06d..8d27a8d68 100644
--- a/_mapClear.js
+++ b/_mapClear.js
@@ -9,7 +9,11 @@ import Map from './_Map';
  * @memberOf MapCache
  */
 function mapClear() {
-  this.__data__ = { 'hash': new Hash, 'map': Map ? new Map : [], 'string': new Hash };
+  this.__data__ = {
+    'hash': new Hash,
+    'map': Map ? new Map : [],
+    'string': new Hash
+  };
 }
 
 export default mapClear;
diff --git a/_root.js b/_root.js
index 85cf03fbe..8f97b7899 100644
--- a/_root.js
+++ b/_root.js
@@ -7,10 +7,14 @@ var objectTypes = {
 };
 
 /** Detect free variable `exports`. */
-var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
+var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
+  ? exports
+  : undefined;
 
 /** Detect free variable `module`. */
-var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
+var freeModule = (objectTypes[typeof module] && module && !module.nodeType)
+  ? module
+  : undefined;
 
 /** Detect free variable `global` from Node.js. */
 var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
@@ -30,6 +34,8 @@ var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
  * The `this` value is used if it's the global object to avoid Greasemonkey's
  * restricted `window` object, otherwise the `window` object is used.
  */
-var root = freeGlobal || ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) || freeSelf || thisGlobal || Function('return this')();
+var root = freeGlobal ||
+  ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||
+    freeSelf || thisGlobal || Function('return this')();
 
 export default root;
diff --git a/_toArrayLikeObject.js b/_toArrayLikeObject.js
deleted file mode 100644
index 865fc5f52..000000000
--- a/_toArrayLikeObject.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import isArrayLikeObject from './isArrayLikeObject';
-
-/**
- * Converts `value` to an array-like object if it's not one.
- *
- * @private
- * @param {*} value The value to process.
- * @returns {Array} Returns the array-like object.
- */
-function toArrayLikeObject(value) {
-  return isArrayLikeObject(value) ? value : [];
-}
-
-export default toArrayLikeObject;
diff --git a/_toFunction.js b/_toFunction.js
deleted file mode 100644
index 0cddddc3d..000000000
--- a/_toFunction.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import identity from './identity';
-
-/**
- * Converts `value` to a function if it's not one.
- *
- * @private
- * @param {*} value The value to process.
- * @returns {Function} Returns the function.
- */
-function toFunction(value) {
-  return typeof value == 'function' ? value : identity;
-}
-
-export default toFunction;
diff --git a/array.default.js b/array.default.js
index 06f864da7..15a60b909 100644
--- a/array.default.js
+++ b/array.default.js
@@ -13,6 +13,7 @@ import findIndex from './findIndex';
 import findLastIndex from './findLastIndex';
 import flatten from './flatten';
 import flattenDeep from './flattenDeep';
+import flattenDepth from './flattenDepth';
 import fromPairs from './fromPairs';
 import head from './head';
 import indexOf from './indexOf';
@@ -64,14 +65,14 @@ export default {
   chunk, compact, concat, difference, differenceBy,
   differenceWith, drop, dropRight, dropRightWhile, dropWhile,
   fill, findIndex, findLastIndex, flatten, flattenDeep,
-  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
+  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
 };
diff --git a/array.js b/array.js
index 0e705fbfd..f6e6fb2a3 100644
--- a/array.js
+++ b/array.js
@@ -13,6 +13,7 @@ export { default as findIndex } from './findIndex';
 export { default as findLastIndex } from './findLastIndex';
 export { default as flatten } from './flatten';
 export { default as flattenDeep } from './flattenDeep';
+export { default as flattenDepth } from './flattenDepth';
 export { default as fromPairs } from './fromPairs';
 export { default as head } from './head';
 export { default as indexOf } from './indexOf';
diff --git a/at.js b/at.js
index 9f8b4f087..988207df3 100644
--- a/at.js
+++ b/at.js
@@ -23,7 +23,7 @@ import rest from './rest';
  * // => ['a', 'c']
  */
 var at = rest(function(object, paths) {
-  return baseAt(object, baseFlatten(paths));
+  return baseAt(object, baseFlatten(paths, 1));
 });
 
 export default at;
diff --git a/attempt.js b/attempt.js
index 56cc0a9c6..70a4ecd26 100644
--- a/attempt.js
+++ b/attempt.js
@@ -1,5 +1,5 @@
 import apply from './_apply';
-import isObject from './isObject';
+import isError from './isError';
 import rest from './rest';
 
 /**
@@ -26,7 +26,7 @@ var attempt = rest(function(func, args) {
   try {
     return apply(func, undefined, args);
   } catch (e) {
-    return isObject(e) ? e : new Error(e);
+    return isError(e) ? e : new Error(e);
   }
 });
 
diff --git a/bindAll.js b/bindAll.js
index 975dae922..0d189d90d 100644
--- a/bindAll.js
+++ b/bindAll.js
@@ -30,7 +30,7 @@ import rest from './rest';
  * // => logs 'clicked docs' when clicked
  */
 var bindAll = rest(function(object, methodNames) {
-  arrayEach(baseFlatten(methodNames), function(key) {
+  arrayEach(baseFlatten(methodNames, 1), function(key) {
     object[key] = bind(object[key], object);
   });
   return object;
diff --git a/castArray.js b/castArray.js
new file mode 100644
index 000000000..68e47079f
--- /dev/null
+++ b/castArray.js
@@ -0,0 +1,43 @@
+import isArray from './isArray';
+
+/**
+ * Casts `value` as an array if it's not one.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the cast array.
+ * @example
+ *
+ * _.castArray(1);
+ * // => [1]
+ *
+ * _.castArray({ 'a': 1 });
+ * // => [{ 'a': 1 }]
+ *
+ * _.castArray('abc');
+ * // => ['abc']
+ *
+ * _.castArray(null);
+ * // => [null]
+ *
+ * _.castArray(undefined);
+ * // => [undefined]
+ *
+ * _.castArray();
+ * // => []
+ *
+ * var array = [1, 2, 3];
+ * console.log(_.castArray(array) === array);
+ * // => true
+ */
+function castArray() {
+  if (!arguments.length) {
+    return [];
+  }
+  var value = arguments[0];
+  return isArray(value) ? value : [value];
+}
+
+export default castArray;
diff --git a/concat.js b/concat.js
index 0b71d10d7..aabe137f9 100644
--- a/concat.js
+++ b/concat.js
@@ -28,7 +28,7 @@ var concat = rest(function(array, values) {
   if (!isArray(array)) {
     array = array == null ? [] : [Object(array)];
   }
-  values = baseFlatten(values);
+  values = baseFlatten(values, 1);
   return arrayConcat(array, values);
 });
 
diff --git a/debounce.js b/debounce.js
index 539776d31..c7852128a 100644
--- a/debounce.js
+++ b/debounce.js
@@ -138,8 +138,10 @@ function debounce(func, wait, options) {
       if (!lastCalled && !maxTimeoutId && !leading) {
         lastCalled = stamp;
       }
-      var remaining = maxWait - (stamp - lastCalled),
-          isCalled = remaining <= 0 || remaining > maxWait;
+      var remaining = maxWait - (stamp - lastCalled);
+
+      var isCalled = (remaining <= 0 || remaining > maxWait) &&
+        (leading || maxTimeoutId);
 
       if (isCalled) {
         if (maxTimeoutId) {
diff --git a/difference.js b/difference.js
index 8691b4494..eb2e283d6 100644
--- a/difference.js
+++ b/difference.js
@@ -21,7 +21,7 @@ import rest from './rest';
  */
 var difference = rest(function(array, values) {
   return isArrayLikeObject(array)
-    ? baseDifference(array, baseFlatten(values, false, true))
+    ? baseDifference(array, baseFlatten(values, 1, true))
     : [];
 });
 
diff --git a/differenceBy.js b/differenceBy.js
index dddbf9b33..cec8d0327 100644
--- a/differenceBy.js
+++ b/differenceBy.js
@@ -32,7 +32,7 @@ var differenceBy = rest(function(array, values) {
     iteratee = undefined;
   }
   return isArrayLikeObject(array)
-    ? baseDifference(array, baseFlatten(values, false, true), baseIteratee(iteratee))
+    ? baseDifference(array, baseFlatten(values, 1, true), baseIteratee(iteratee))
     : [];
 });
 
diff --git a/differenceWith.js b/differenceWith.js
index 52956b0fd..e2f13959a 100644
--- a/differenceWith.js
+++ b/differenceWith.js
@@ -29,7 +29,7 @@ var differenceWith = rest(function(array, values) {
     comparator = undefined;
   }
   return isArrayLikeObject(array)
-    ? baseDifference(array, baseFlatten(values, false, true), undefined, comparator)
+    ? baseDifference(array, baseFlatten(values, 1, true), undefined, comparator)
     : [];
 });
 
diff --git a/flatMap.js b/flatMap.js
index 34959f609..8091faa78 100644
--- a/flatMap.js
+++ b/flatMap.js
@@ -22,7 +22,7 @@ import map from './map';
  * // => [1, 1, 2, 2]
  */
 function flatMap(collection, iteratee) {
-  return baseFlatten(map(collection, iteratee));
+  return baseFlatten(map(collection, iteratee), 1);
 }
 
 export default flatMap;
diff --git a/flatten.js b/flatten.js
index 379f126e8..09f603bfb 100644
--- a/flatten.js
+++ b/flatten.js
@@ -1,7 +1,7 @@
 import baseFlatten from './_baseFlatten';
 
 /**
- * Flattens `array` a single level.
+ * Flattens `array` a single level deep.
  *
  * @static
  * @memberOf _
@@ -10,12 +10,12 @@ import baseFlatten from './_baseFlatten';
  * @returns {Array} Returns the new flattened array.
  * @example
  *
- * _.flatten([1, [2, 3, [4]]]);
- * // => [1, 2, 3, [4]]
+ * _.flatten([1, [2, [3, [4]], 5]]);
+ * // => [1, 2, [3, [4]], 5]
  */
 function flatten(array) {
   var length = array ? array.length : 0;
-  return length ? baseFlatten(array) : [];
+  return length ? baseFlatten(array, 1) : [];
 }
 
 export default flatten;
diff --git a/flattenDeep.js b/flattenDeep.js
index 782dc5281..1a9970e00 100644
--- a/flattenDeep.js
+++ b/flattenDeep.js
@@ -1,21 +1,24 @@
 import baseFlatten from './_baseFlatten';
 
+/** Used as references for various `Number` constants. */
+var INFINITY = 1 / 0;
+
 /**
- * This method is like `_.flatten` except that it recursively flattens `array`.
+ * Recursively flattens `array`.
  *
  * @static
  * @memberOf _
  * @category Array
- * @param {Array} array The array to recursively flatten.
+ * @param {Array} array The array to flatten.
  * @returns {Array} Returns the new flattened array.
  * @example
  *
- * _.flattenDeep([1, [2, 3, [4]]]);
- * // => [1, 2, 3, 4]
+ * _.flattenDeep([1, [2, [3, [4]], 5]]);
+ * // => [1, 2, 3, 4, 5]
  */
 function flattenDeep(array) {
   var length = array ? array.length : 0;
-  return length ? baseFlatten(array, true) : [];
+  return length ? baseFlatten(array, INFINITY) : [];
 }
 
 export default flattenDeep;
diff --git a/flattenDepth.js b/flattenDepth.js
new file mode 100644
index 000000000..b658e33ba
--- /dev/null
+++ b/flattenDepth.js
@@ -0,0 +1,32 @@
+import baseFlatten from './_baseFlatten';
+import toInteger from './toInteger';
+
+/**
+ * Recursively flatten `array` up to `depth` times.
+ *
+ * @static
+ * @memberOf _
+ * @category Array
+ * @param {Array} array The array to flatten.
+ * @param {number} [depth=1] The maximum recursion depth.
+ * @returns {Array} Returns the new flattened array.
+ * @example
+ *
+ * var array = [1, [2, [3, [4]], 5]];
+ *
+ * _.flattenDepth(array, 1);
+ * // => [1, 2, [3, [4]], 5]
+ *
+ * _.flattenDepth(array, 2);
+ * // => [1, 2, 3, [4], 5]
+ */
+function flattenDepth(array, depth) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return [];
+  }
+  depth = depth === undefined ? 1 : toInteger(depth);
+  return baseFlatten(array, depth);
+}
+
+export default flattenDepth;
diff --git a/forEach.js b/forEach.js
index 30055ac45..6ecb13ba0 100644
--- a/forEach.js
+++ b/forEach.js
@@ -1,7 +1,7 @@
 import arrayEach from './_arrayEach';
+import baseCastFunction from './_baseCastFunction';
 import baseEach from './_baseEach';
 import isArray from './isArray';
-import toFunction from './_toFunction';
 
 /**
  * Iterates over elements of `collection` invoking `iteratee` for each element.
@@ -34,7 +34,7 @@ import toFunction from './_toFunction';
 function forEach(collection, iteratee) {
   return (typeof iteratee == 'function' && isArray(collection))
     ? arrayEach(collection, iteratee)
-    : baseEach(collection, toFunction(iteratee));
+    : baseEach(collection, baseCastFunction(iteratee));
 }
 
 export default forEach;
diff --git a/forEachRight.js b/forEachRight.js
index 2f1ec34ba..66714170b 100644
--- a/forEachRight.js
+++ b/forEachRight.js
@@ -1,7 +1,7 @@
 import arrayEachRight from './_arrayEachRight';
+import baseCastFunction from './_baseCastFunction';
 import baseEachRight from './_baseEachRight';
 import isArray from './isArray';
-import toFunction from './_toFunction';
 
 /**
  * This method is like `_.forEach` except that it iterates over elements of
@@ -24,7 +24,7 @@ import toFunction from './_toFunction';
 function forEachRight(collection, iteratee) {
   return (typeof iteratee == 'function' && isArray(collection))
     ? arrayEachRight(collection, iteratee)
-    : baseEachRight(collection, toFunction(iteratee));
+    : baseEachRight(collection, baseCastFunction(iteratee));
 }
 
 export default forEachRight;
diff --git a/forIn.js b/forIn.js
index 6ed3c1823..dba18f787 100644
--- a/forIn.js
+++ b/forIn.js
@@ -1,6 +1,6 @@
+import baseCastFunction from './_baseCastFunction';
 import baseFor from './_baseFor';
 import keysIn from './keysIn';
-import toFunction from './_toFunction';
 
 /**
  * Iterates over own and inherited enumerable properties of an object invoking
@@ -29,7 +29,9 @@ import toFunction from './_toFunction';
  * // => logs 'a', 'b', then 'c' (iteration order is not guaranteed)
  */
 function forIn(object, iteratee) {
-  return object == null ? object : baseFor(object, toFunction(iteratee), keysIn);
+  return object == null
+    ? object
+    : baseFor(object, baseCastFunction(iteratee), keysIn);
 }
 
 export default forIn;
diff --git a/forInRight.js b/forInRight.js
index 516ba43f8..e512dd1f6 100644
--- a/forInRight.js
+++ b/forInRight.js
@@ -1,6 +1,6 @@
+import baseCastFunction from './_baseCastFunction';
 import baseForRight from './_baseForRight';
 import keysIn from './keysIn';
-import toFunction from './_toFunction';
 
 /**
  * This method is like `_.forIn` except that it iterates over properties of
@@ -27,7 +27,9 @@ import toFunction from './_toFunction';
  * // => logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'
  */
 function forInRight(object, iteratee) {
-  return object == null ? object : baseForRight(object, toFunction(iteratee), keysIn);
+  return object == null
+    ? object
+    : baseForRight(object, baseCastFunction(iteratee), keysIn);
 }
 
 export default forInRight;
diff --git a/forOwn.js b/forOwn.js
index 294ac1c9e..e849d367b 100644
--- a/forOwn.js
+++ b/forOwn.js
@@ -1,5 +1,5 @@
+import baseCastFunction from './_baseCastFunction';
 import baseForOwn from './_baseForOwn';
-import toFunction from './_toFunction';
 
 /**
  * Iterates over own enumerable properties of an object invoking `iteratee`
@@ -28,7 +28,7 @@ import toFunction from './_toFunction';
  * // => logs 'a' then 'b' (iteration order is not guaranteed)
  */
 function forOwn(object, iteratee) {
-  return object && baseForOwn(object, toFunction(iteratee));
+  return object && baseForOwn(object, baseCastFunction(iteratee));
 }
 
 export default forOwn;
diff --git a/forOwnRight.js b/forOwnRight.js
index 504859a28..825125d2c 100644
--- a/forOwnRight.js
+++ b/forOwnRight.js
@@ -1,5 +1,5 @@
+import baseCastFunction from './_baseCastFunction';
 import baseForOwnRight from './_baseForOwnRight';
-import toFunction from './_toFunction';
 
 /**
  * This method is like `_.forOwn` except that it iterates over properties of
@@ -26,7 +26,7 @@ import toFunction from './_toFunction';
  * // => logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'
  */
 function forOwnRight(object, iteratee) {
-  return object && baseForOwnRight(object, toFunction(iteratee));
+  return object && baseForOwnRight(object, baseCastFunction(iteratee));
 }
 
 export default forOwnRight;
diff --git a/intersection.js b/intersection.js
index 4de5a206e..60b3a0913 100644
--- a/intersection.js
+++ b/intersection.js
@@ -1,7 +1,7 @@
 import arrayMap from './_arrayMap';
+import baseCastArrayLikeObject from './_baseCastArrayLikeObject';
 import baseIntersection from './_baseIntersection';
 import rest from './rest';
-import toArrayLikeObject from './_toArrayLikeObject';
 
 /**
  * Creates an array of unique values that are included in all given arrays
@@ -19,7 +19,7 @@ import toArrayLikeObject from './_toArrayLikeObject';
  * // => [2]
  */
 var intersection = rest(function(arrays) {
-  var mapped = arrayMap(arrays, toArrayLikeObject);
+  var mapped = arrayMap(arrays, baseCastArrayLikeObject);
   return (mapped.length && mapped[0] === arrays[0])
     ? baseIntersection(mapped)
     : [];
diff --git a/intersectionBy.js b/intersectionBy.js
index af686e4b7..880668abb 100644
--- a/intersectionBy.js
+++ b/intersectionBy.js
@@ -1,9 +1,9 @@
 import arrayMap from './_arrayMap';
+import baseCastArrayLikeObject from './_baseCastArrayLikeObject';
 import baseIntersection from './_baseIntersection';
 import baseIteratee from './_baseIteratee';
 import last from './last';
 import rest from './rest';
-import toArrayLikeObject from './_toArrayLikeObject';
 
 /**
  * This method is like `_.intersection` except that it accepts `iteratee`
@@ -27,7 +27,7 @@ import toArrayLikeObject from './_toArrayLikeObject';
  */
 var intersectionBy = rest(function(arrays) {
   var iteratee = last(arrays),
-      mapped = arrayMap(arrays, toArrayLikeObject);
+      mapped = arrayMap(arrays, baseCastArrayLikeObject);
 
   if (iteratee === last(mapped)) {
     iteratee = undefined;
diff --git a/intersectionWith.js b/intersectionWith.js
index 4dc7a6766..59d5ff1ac 100644
--- a/intersectionWith.js
+++ b/intersectionWith.js
@@ -1,8 +1,8 @@
 import arrayMap from './_arrayMap';
+import baseCastArrayLikeObject from './_baseCastArrayLikeObject';
 import baseIntersection from './_baseIntersection';
 import last from './last';
 import rest from './rest';
-import toArrayLikeObject from './_toArrayLikeObject';
 
 /**
  * This method is like `_.intersection` except that it accepts `comparator`
@@ -25,7 +25,7 @@ import toArrayLikeObject from './_toArrayLikeObject';
  */
 var intersectionWith = rest(function(arrays) {
   var comparator = last(arrays),
-      mapped = arrayMap(arrays, toArrayLikeObject);
+      mapped = arrayMap(arrays, baseCastArrayLikeObject);
 
   if (comparator === last(mapped)) {
     comparator = undefined;
diff --git a/isArray.js b/isArray.js
index 8c1d036f2..2657ccc2c 100644
--- a/isArray.js
+++ b/isArray.js
@@ -3,7 +3,7 @@
  *
  * @static
  * @memberOf _
- * @type Function
+ * @type {Function}
  * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
diff --git a/isArrayBuffer.js b/isArrayBuffer.js
index 4bbfe8e4f..9201e9445 100644
--- a/isArrayBuffer.js
+++ b/isArrayBuffer.js
@@ -16,7 +16,6 @@ var objectToString = objectProto.toString;
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
diff --git a/isArrayLike.js b/isArrayLike.js
index 981e18600..cf64b36d8 100644
--- a/isArrayLike.js
+++ b/isArrayLike.js
@@ -9,7 +9,6 @@ import isLength from './isLength';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
diff --git a/isArrayLikeObject.js b/isArrayLikeObject.js
index c73838a38..991ef40e2 100644
--- a/isArrayLikeObject.js
+++ b/isArrayLikeObject.js
@@ -7,7 +7,6 @@ import isObjectLike from './isObjectLike';
  *
  * @static
  * @memberOf _
- * @type Function
  * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.
diff --git a/isBuffer.js b/isBuffer.js
index d092a94f2..bfccb20e3 100644
--- a/isBuffer.js
+++ b/isBuffer.js
@@ -8,13 +8,19 @@ var objectTypes = {
 };
 
 /** Detect free variable `exports`. */
-var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType) ? exports : null;
+var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
+  ? exports
+  : undefined;
 
 /** Detect free variable `module`. */
-var freeModule = (objectTypes[typeof module] && module && !module.nodeType) ? module : null;
+var freeModule = (objectTypes[typeof module] && module && !module.nodeType)
+  ? module
+  : undefined;
 
 /** Detect the popular CommonJS extension `module.exports`. */
-var moduleExports = (freeModule && freeModule.exports === freeExports) ? freeExports : null;
+var moduleExports = (freeModule && freeModule.exports === freeExports)
+  ? freeExports
+  : undefined;
 
 /** Built-in value references. */
 var Buffer = moduleExports ? root.Buffer : undefined;
diff --git a/isEmpty.js b/isEmpty.js
index 64f348e28..b12758a1c 100644
--- a/isEmpty.js
+++ b/isEmpty.js
@@ -39,7 +39,8 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  */
 function isEmpty(value) {
   if (isArrayLike(value) &&
-      (isArray(value) || isString(value) || isFunction(value.splice) || isArguments(value))) {
+      (isArray(value) || isString(value) ||
+        isFunction(value.splice) || isArguments(value))) {
     return !value.length;
   }
   for (var key in value) {
diff --git a/isEqualWith.js b/isEqualWith.js
index 0518f08ff..d4d3da7fe 100644
--- a/isEqualWith.js
+++ b/isEqualWith.js
@@ -1,10 +1,10 @@
 import baseIsEqual from './_baseIsEqual';
 
 /**
- * This method is like `_.isEqual` except that it accepts `customizer` which is
- * invoked to compare values. If `customizer` returns `undefined` comparisons are
- * handled by the method instead. The `customizer` is invoked with up to six arguments:
- * (objValue, othValue [, index|key, object, other, stack]).
+ * This method is like `_.isEqual` except that it accepts `customizer` which
+ * is invoked to compare values. If `customizer` returns `undefined` comparisons
+ * are handled by the method instead. The `customizer` is invoked with up to
+ * six arguments: (objValue, othValue [, index|key, object, other, stack]).
  *
  * @static
  * @memberOf _
diff --git a/isError.js b/isError.js
index 6ec72aac8..01565170c 100644
--- a/isError.js
+++ b/isError.js
@@ -30,8 +30,12 @@ var objectToString = objectProto.toString;
  * // => false
  */
 function isError(value) {
-  return isObjectLike(value) &&
-    typeof value.message == 'string' && objectToString.call(value) == errorTag;
+  if (!isObjectLike(value)) {
+    return false;
+  }
+  var Ctor = value.constructor;
+  return (objectToString.call(value) == errorTag) ||
+    (typeof Ctor == 'function' && objectToString.call(Ctor.prototype) == errorTag);
 }
 
 export default isError;
diff --git a/isLength.js b/isLength.js
index d13d42318..6dd6cc5ec 100644
--- a/isLength.js
+++ b/isLength.js
@@ -26,7 +26,8 @@ var MAX_SAFE_INTEGER = 9007199254740991;
  * // => false
  */
 function isLength(value) {
-  return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+  return typeof value == 'number' &&
+    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
 }
 
 export default isLength;
diff --git a/isMatch.js b/isMatch.js
index c49669a93..14186f601 100644
--- a/isMatch.js
+++ b/isMatch.js
@@ -2,8 +2,9 @@ import baseIsMatch from './_baseIsMatch';
 import getMatchData from './_getMatchData';
 
 /**
- * Performs a deep comparison between `object` and `source` to determine if
- * `object` contains equivalent property values.
+ * Performs a partial deep comparison between `object` and `source` to
+ * determine if `object` contains equivalent property values. This method is
+ * equivalent to a `_.matches` function when `source` is partially applied.
  *
  * **Note:** This method supports comparing the same values as `_.isEqual`.
  *
diff --git a/isPlainObject.js b/isPlainObject.js
index 2b15908a5..8e11c789e 100644
--- a/isPlainObject.js
+++ b/isPlainObject.js
@@ -50,7 +50,8 @@ var getPrototypeOf = Object.getPrototypeOf;
  * // => true
  */
 function isPlainObject(value) {
-  if (!isObjectLike(value) || objectToString.call(value) != objectTag || isHostObject(value)) {
+  if (!isObjectLike(value) ||
+      objectToString.call(value) != objectTag || isHostObject(value)) {
     return false;
   }
   var proto = objectProto;
diff --git a/isTypedArray.js b/isTypedArray.js
index e1f9e5481..e96f32e20 100644
--- a/isTypedArray.js
+++ b/isTypedArray.js
@@ -68,7 +68,8 @@ var objectToString = objectProto.toString;
  * // => false
  */
 function isTypedArray(value) {
-  return isObjectLike(value) && isLength(value.length) && !!typedArrayTags[objectToString.call(value)];
+  return isObjectLike(value) &&
+    isLength(value.length) && !!typedArrayTags[objectToString.call(value)];
 }
 
 export default isTypedArray;
diff --git a/iteratee.js b/iteratee.js
index 56344d7cf..2e791fc70 100644
--- a/iteratee.js
+++ b/iteratee.js
@@ -5,7 +5,8 @@ import baseIteratee from './_baseIteratee';
  * Creates a function that invokes `func` with the arguments of the created
  * function. If `func` is a property name the created callback returns the
  * property value for a given element. If `func` is an object the created
- * callback returns `true` for elements that contain the equivalent object properties, otherwise it returns `false`.
+ * callback returns `true` for elements that contain the equivalent object
+ * properties, otherwise it returns `false`.
  *
  * @static
  * @memberOf _
diff --git a/lang.default.js b/lang.default.js
index b76e7b81e..f56c00e73 100644
--- a/lang.default.js
+++ b/lang.default.js
@@ -1,3 +1,4 @@
+import castArray from './castArray';
 import clone from './clone';
 import cloneDeep from './cloneDeep';
 import cloneDeepWith from './cloneDeepWith';
@@ -53,15 +54,15 @@ import toSafeInteger from './toSafeInteger';
 import toString from './toString';
 
 export default {
-  clone, cloneDeep, cloneDeepWith, cloneWith, eq,
-  gt, gte, 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, isSymbol,
-  isTypedArray, isUndefined, isWeakMap, isWeakSet, lt,
-  lte, toArray, toInteger, toLength, toNumber,
-  toPlainObject, toSafeInteger, toString
+  castArray, clone, cloneDeep, cloneDeepWith, cloneWith,
+  eq, gt, gte, 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,
+  isSymbol, isTypedArray, isUndefined, isWeakMap, isWeakSet,
+  lt, lte, toArray, toInteger, toLength,
+  toNumber, toPlainObject, toSafeInteger, toString
 };
diff --git a/lang.js b/lang.js
index 2fb3db6d9..4d7b42def 100644
--- a/lang.js
+++ b/lang.js
@@ -1,3 +1,4 @@
+export { default as castArray } from './castArray';
 export { default as clone } from './clone';
 export { default as cloneDeep } from './cloneDeep';
 export { default as cloneDeepWith } from './cloneDeepWith';
diff --git a/lodash.default.js b/lodash.default.js
index a8ca95744..e227fc796 100644
--- a/lodash.default.js
+++ b/lodash.default.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.3.0 (Custom Build) <https://lodash.com/>
+ * lodash 4.4.0 (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 = '4.3.0';
+var VERSION = '4.4.0';
 
 /** Used to compose bitmasks for wrapper metadata. */
 var BIND_KEY_FLAG = 2;
@@ -100,6 +100,7 @@ lodash.before = func.before;
 lodash.bind = func.bind;
 lodash.bindAll = util.bindAll;
 lodash.bindKey = func.bindKey;
+lodash.castArray = lang.castArray;
 lodash.chain = seq.chain;
 lodash.chunk = array.chunk;
 lodash.compact = array.compact;
@@ -128,6 +129,7 @@ lodash.filter = collection.filter;
 lodash.flatMap = collection.flatMap;
 lodash.flatten = array.flatten;
 lodash.flattenDeep = array.flattenDeep;
+lodash.flattenDepth = array.flattenDepth;
 lodash.flip = func.flip;
 lodash.flow = util.flow;
 lodash.flowRight = util.flowRight;
@@ -396,7 +398,7 @@ mixin(lodash, (function() {
  *
  * @static
  * @memberOf _
- * @type string
+ * @type {string}
  */
 lodash.VERSION = VERSION;
 (lodash.templateSettings = string.templateSettings).imports._ = lodash;
@@ -419,7 +421,10 @@ arrayEach(['drop', 'take'], function(methodName, index) {
     if (filtered) {
       result.__takeCount__ = nativeMin(n, result.__takeCount__);
     } else {
-      result.__views__.push({ 'size': nativeMin(n, MAX_ARRAY_LENGTH), 'type': methodName + (result.__dir__ < 0 ? 'Right' : '') });
+      result.__views__.push({
+        'size': nativeMin(n, MAX_ARRAY_LENGTH),
+        'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
+      });
     }
     return result;
   };
@@ -436,7 +441,10 @@ arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
 
   LazyWrapper.prototype[methodName] = function(iteratee) {
     var result = this.clone();
-    result.__iteratees__.push({ 'iteratee': baseIteratee(iteratee, 3), 'type': type });
+    result.__iteratees__.push({
+      'iteratee': baseIteratee(iteratee, 3),
+      'type': type
+    });
     result.__filtered__ = result.__filtered__ || isFilter;
     return result;
   };
@@ -588,7 +596,10 @@ baseForOwn(LazyWrapper.prototype, function(func, methodName) {
   }
 });
 
-realNames[createHybridWrapper(undefined, BIND_KEY_FLAG).name] = [{ 'name': 'wrapper', 'func': undefined }];
+realNames[createHybridWrapper(undefined, BIND_KEY_FLAG).name] = [{
+  'name': 'wrapper',
+  'func': undefined
+}];
 
 // Add functions to the lazy wrapper.
 LazyWrapper.prototype.clone = lazyClone;
diff --git a/lodash.js b/lodash.js
index 36ead17df..746fab809 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1,6 +1,6 @@
 /**
  * @license
- * lodash 4.3.0 (Custom Build) <https://lodash.com/>
+ * lodash 4.4.0 (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>
@@ -22,6 +22,7 @@ export { default as bindAll } from './bindAll';
 export { default as bindKey } from './bindKey';
 export { default as camelCase } from './camelCase';
 export { default as capitalize } from './capitalize';
+export { default as castArray } from './castArray';
 export { default as ceil } from './ceil';
 export { default as chain } from './chain';
 export { default as chunk } from './chunk';
@@ -73,6 +74,7 @@ export { default as findLastKey } from './findLastKey';
 export { default as flatMap } from './flatMap';
 export { default as flatten } from './flatten';
 export { default as flattenDeep } from './flattenDeep';
+export { default as flattenDepth } from './flattenDepth';
 export { default as flip } from './flip';
 export { default as floor } from './floor';
 export { default as flow } from './flow';
diff --git a/matches.js b/matches.js
index f8c3cd2da..1e4e9bcbb 100644
--- a/matches.js
+++ b/matches.js
@@ -2,9 +2,10 @@ import baseClone from './_baseClone';
 import baseMatches from './_baseMatches';
 
 /**
- * Creates a function that performs a deep partial comparison between a given
+ * Creates a function that performs a partial deep comparison between a given
  * object and `source`, returning `true` if the given object has equivalent
- * property values, else `false`.
+ * property values, else `false`. The created function is equivalent to
+ * `_.isMatch` with a `source` partially applied.
  *
  * **Note:** This method supports comparing the same values as `_.isEqual`.
  *
diff --git a/matchesProperty.js b/matchesProperty.js
index 52d24ec41..4a8c3d6e4 100644
--- a/matchesProperty.js
+++ b/matchesProperty.js
@@ -2,7 +2,7 @@ import baseClone from './_baseClone';
 import baseMatchesProperty from './_baseMatchesProperty';
 
 /**
- * Creates a function that performs a deep partial comparison between the
+ * Creates a function that performs a partial deep comparison between the
  * value at `path` of a given object to `srcValue`, returning `true` if the
  * object value is equivalent, else `false`.
  *
diff --git a/merge.js b/merge.js
index 85cc86409..a00334f92 100644
--- a/merge.js
+++ b/merge.js
@@ -2,12 +2,12 @@ import baseMerge from './_baseMerge';
 import createAssigner from './_createAssigner';
 
 /**
- * Recursively merges own and inherited enumerable properties of source
- * objects into the destination object, skipping source properties that resolve
- * to `undefined`. 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.
+ * 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/now.js b/now.js
index 8480fdf46..2a751946f 100644
--- a/now.js
+++ b/now.js
@@ -4,7 +4,7 @@
  *
  * @static
  * @memberOf _
- * @type Function
+ * @type {Function}
  * @category Date
  * @returns {number} Returns the timestamp.
  * @example
diff --git a/omit.js b/omit.js
index c073d0bd3..3b5b2fedc 100644
--- a/omit.js
+++ b/omit.js
@@ -14,7 +14,7 @@ import rest from './rest';
  * @category Object
  * @param {Object} object The source object.
  * @param {...(string|string[])} [props] The property names to omit, specified
- *  individually or in arrays..
+ *  individually or in arrays.
  * @returns {Object} Returns the new object.
  * @example
  *
@@ -27,7 +27,7 @@ var omit = rest(function(object, props) {
   if (object == null) {
     return {};
   }
-  props = arrayMap(baseFlatten(props), String);
+  props = arrayMap(baseFlatten(props, 1), String);
   return basePick(object, baseDifference(keysIn(object), props));
 });
 
diff --git a/overArgs.js b/overArgs.js
index fde6c73c3..53a8ae3ca 100644
--- a/overArgs.js
+++ b/overArgs.js
@@ -39,7 +39,7 @@ var nativeMin = Math.min;
  * // => [100, 10]
  */
 var overArgs = rest(function(func, transforms) {
-  transforms = arrayMap(baseFlatten(transforms), baseIteratee);
+  transforms = arrayMap(baseFlatten(transforms, 1), baseIteratee);
 
   var funcsLength = transforms.length;
   return rest(function(args) {
diff --git a/package.json b/package.json
index a1baa7ff8..1bd256807 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "lodash-es",
-  "version": "4.3.0",
+  "version": "4.4.0",
   "description": "Lodash exported as ES modules.",
   "homepage": "https://lodash.com/custom-builds",
   "license": "MIT",
diff --git a/parseInt.js b/parseInt.js
index f99099a56..5019e2c99 100644
--- a/parseInt.js
+++ b/parseInt.js
@@ -22,7 +22,7 @@ var nativeParseInt = root.parseInt;
  * @memberOf _
  * @category String
  * @param {string} string The string to convert.
- * @param {number} [radix] The radix to interpret `value` by.
+ * @param {number} [radix=10] The radix to interpret `value` by.
  * @param- {Object} [guard] Enables use as an iteratee for functions like `_.map`.
  * @returns {number} Returns the converted integer.
  * @example
diff --git a/pick.js b/pick.js
index 9be4baf7c..7399ccbf1 100644
--- a/pick.js
+++ b/pick.js
@@ -20,7 +20,7 @@ import rest from './rest';
  * // => { 'a': 1, 'c': 3 }
  */
 var pick = rest(function(object, props) {
-  return object == null ? {} : basePick(object, baseFlatten(props));
+  return object == null ? {} : basePick(object, baseFlatten(props, 1));
 });
 
 export default pick;
diff --git a/pullAt.js b/pullAt.js
index 28f1eb679..6b7fca7b8 100644
--- a/pullAt.js
+++ b/pullAt.js
@@ -30,7 +30,7 @@ import rest from './rest';
  * // => [10, 20]
  */
 var pullAt = rest(function(array, indexes) {
-  indexes = arrayMap(baseFlatten(indexes), String);
+  indexes = arrayMap(baseFlatten(indexes, 1), String);
 
   var result = baseAt(array, indexes);
   basePullAt(array, indexes.sort(compareAscending));
diff --git a/rearg.js b/rearg.js
index 720f05c9f..2724fe7d4 100644
--- a/rearg.js
+++ b/rearg.js
@@ -28,7 +28,7 @@ var REARG_FLAG = 256;
  * // => ['a', 'b', 'c']
  */
 var rearg = rest(function(func, indexes) {
-  return createWrapper(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes));
+  return createWrapper(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes, 1));
 });
 
 export default rearg;
diff --git a/result.js b/result.js
index 1e21a7e35..b53e79f09 100644
--- a/result.js
+++ b/result.js
@@ -1,4 +1,4 @@
-import baseToPath from './_baseToPath';
+import baseCastPath from './_baseCastPath';
 import get from './get';
 import isFunction from './isFunction';
 import isKey from './_isKey';
@@ -34,7 +34,7 @@ import parent from './_parent';
  */
 function result(object, path, defaultValue) {
   if (!isKey(path, object)) {
-    path = baseToPath(path);
+    path = baseCastPath(path);
     var result = get(object, path);
     object = parent(object, path);
   } else {
diff --git a/sortBy.js b/sortBy.js
index 09b9e4374..2008cbf51 100644
--- a/sortBy.js
+++ b/sortBy.js
@@ -46,7 +46,7 @@ var sortBy = rest(function(collection, iteratees) {
   } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
     iteratees.length = 1;
   }
-  return baseOrderBy(collection, baseFlatten(iteratees), []);
+  return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
 });
 
 export default sortBy;
diff --git a/template.js b/template.js
index 2bc780322..e9880070b 100644
--- a/template.js
+++ b/template.js
@@ -210,7 +210,8 @@ function template(string, options, guard) {
     'return __p\n}';
 
   var result = attempt(function() {
-    return Function(importsKeys, sourceURL + 'return ' + source).apply(undefined, importsValues);
+    return Function(importsKeys, sourceURL + 'return ' + source)
+      .apply(undefined, importsValues);
   });
 
   // Provide the compiled function's source by its `toString` method or
diff --git a/templateSettings.js b/templateSettings.js
index c614525a4..b310bdbda 100644
--- a/templateSettings.js
+++ b/templateSettings.js
@@ -10,7 +10,7 @@ import reInterpolate from './_reInterpolate';
  *
  * @static
  * @memberOf _
- * @type Object
+ * @type {Object}
  */
 var templateSettings = {
 
@@ -18,7 +18,7 @@ var templateSettings = {
    * Used to detect `data` property values to be HTML-escaped.
    *
    * @memberOf _.templateSettings
-   * @type RegExp
+   * @type {RegExp}
    */
   'escape': reEscape,
 
@@ -26,7 +26,7 @@ var templateSettings = {
    * Used to detect code to be evaluated.
    *
    * @memberOf _.templateSettings
-   * @type RegExp
+   * @type {RegExp}
    */
   'evaluate': reEvaluate,
 
@@ -34,7 +34,7 @@ var templateSettings = {
    * Used to detect `data` property values to inject.
    *
    * @memberOf _.templateSettings
-   * @type RegExp
+   * @type {RegExp}
    */
   'interpolate': reInterpolate,
 
@@ -42,7 +42,7 @@ var templateSettings = {
    * Used to reference the data object in the template text.
    *
    * @memberOf _.templateSettings
-   * @type string
+   * @type {string}
    */
   'variable': '',
 
@@ -50,7 +50,7 @@ var templateSettings = {
    * Used to import variables into the compiled template.
    *
    * @memberOf _.templateSettings
-   * @type Object
+   * @type {Object}
    */
   'imports': {
 
@@ -58,7 +58,7 @@ var templateSettings = {
      * A reference to the `lodash` function.
      *
      * @memberOf _.templateSettings.imports
-     * @type Function
+     * @type {Function}
      */
     '_': { 'escape': escape }
   }
diff --git a/throttle.js b/throttle.js
index 93b4aeca3..a5285a1c0 100644
--- a/throttle.js
+++ b/throttle.js
@@ -55,7 +55,11 @@ function throttle(func, wait, options) {
     leading = 'leading' in options ? !!options.leading : leading;
     trailing = 'trailing' in options ? !!options.trailing : trailing;
   }
-  return debounce(func, wait, { 'leading': leading, 'maxWait': wait, 'trailing': trailing });
+  return debounce(func, wait, {
+    'leading': leading,
+    'maxWait': wait,
+    'trailing': trailing
+  });
 }
 
 export default throttle;
diff --git a/times.js b/times.js
index 30b4503e1..efdcfb016 100644
--- a/times.js
+++ b/times.js
@@ -1,5 +1,5 @@
+import baseCastFunction from './_baseCastFunction';
 import baseTimes from './_baseTimes';
-import toFunction from './_toFunction';
 import toInteger from './toInteger';
 
 /** Used as references for various `Number` constants. */
@@ -37,7 +37,7 @@ function times(n, iteratee) {
   var index = MAX_ARRAY_LENGTH,
       length = nativeMin(n, MAX_ARRAY_LENGTH);
 
-  iteratee = toFunction(iteratee);
+  iteratee = baseCastFunction(iteratee);
   n -= MAX_ARRAY_LENGTH;
 
   var result = baseTimes(length, iteratee);
diff --git a/toPairs.js b/toPairs.js
index 4a411e1fc..0ee750ecc 100644
--- a/toPairs.js
+++ b/toPairs.js
@@ -2,7 +2,8 @@ import baseToPairs from './_baseToPairs';
 import keys from './keys';
 
 /**
- * Creates an array of own enumerable key-value pairs for `object`.
+ * Creates an array of own enumerable key-value pairs for `object` which
+ * can be consumed by `_.fromPairs`.
  *
  * @static
  * @memberOf _
diff --git a/toPairsIn.js b/toPairsIn.js
index 950f14b85..f8f1ac189 100644
--- a/toPairsIn.js
+++ b/toPairsIn.js
@@ -2,7 +2,8 @@ import baseToPairs from './_baseToPairs';
 import keysIn from './keysIn';
 
 /**
- * Creates an array of own and inherited enumerable key-value pairs for `object`.
+ * Creates an array of own and inherited enumerable key-value pairs for
+ * `object` which can be consumed by `_.fromPairs`.
  *
  * @static
  * @memberOf _
diff --git a/trim.js b/trim.js
index 76c8adc3d..f70895b06 100644
--- a/trim.js
+++ b/trim.js
@@ -42,7 +42,9 @@ function trim(string, chars, guard) {
   var strSymbols = stringToArray(string),
       chrSymbols = stringToArray(chars);
 
-  return strSymbols.slice(charsStartIndex(strSymbols, chrSymbols), charsEndIndex(strSymbols, chrSymbols) + 1).join('');
+  return strSymbols
+    .slice(charsStartIndex(strSymbols, chrSymbols), charsEndIndex(strSymbols, chrSymbols) + 1)
+    .join('');
 }
 
 export default trim;
diff --git a/trimEnd.js b/trimEnd.js
index fbde7f963..ab2d1f3f2 100644
--- a/trimEnd.js
+++ b/trimEnd.js
@@ -36,7 +36,9 @@ function trimEnd(string, chars, guard) {
     return string;
   }
   var strSymbols = stringToArray(string);
-  return strSymbols.slice(0, charsEndIndex(strSymbols, stringToArray(chars)) + 1).join('');
+  return strSymbols
+    .slice(0, charsEndIndex(strSymbols, stringToArray(chars)) + 1)
+    .join('');
 }
 
 export default trimEnd;
diff --git a/trimStart.js b/trimStart.js
index efd13c605..7f40935f9 100644
--- a/trimStart.js
+++ b/trimStart.js
@@ -36,7 +36,9 @@ function trimStart(string, chars, guard) {
     return string;
   }
   var strSymbols = stringToArray(string);
-  return strSymbols.slice(charsStartIndex(strSymbols, stringToArray(chars))).join('');
+  return strSymbols
+    .slice(charsStartIndex(strSymbols, stringToArray(chars)))
+    .join('');
 }
 
 export default trimStart;
diff --git a/truncate.js b/truncate.js
index 0da2a02c6..9e4c689fd 100644
--- a/truncate.js
+++ b/truncate.js
@@ -33,7 +33,7 @@ var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange
  * @memberOf _
  * @category String
  * @param {string} [string=''] The string to truncate.
- * @param {Object} [options] The options object.
+ * @param {Object} [options=({})] The options object.
  * @param {number} [options.length=30] The maximum string length.
  * @param {string} [options.omission='...'] The string to indicate text is omitted.
  * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
diff --git a/union.js b/union.js
index 6d7a7ed84..bc3d5e70d 100644
--- a/union.js
+++ b/union.js
@@ -18,7 +18,7 @@ import rest from './rest';
  * // => [2, 1, 4]
  */
 var union = rest(function(arrays) {
-  return baseUniq(baseFlatten(arrays, false, true));
+  return baseUniq(baseFlatten(arrays, 1, true));
 });
 
 export default union;
diff --git a/unionBy.js b/unionBy.js
index fa6644eb2..bd547cddd 100644
--- a/unionBy.js
+++ b/unionBy.js
@@ -30,7 +30,7 @@ var unionBy = rest(function(arrays) {
   if (isArrayLikeObject(iteratee)) {
     iteratee = undefined;
   }
-  return baseUniq(baseFlatten(arrays, false, true), baseIteratee(iteratee));
+  return baseUniq(baseFlatten(arrays, 1, true), baseIteratee(iteratee));
 });
 
 export default unionBy;
diff --git a/unionWith.js b/unionWith.js
index ff6e45a12..4bf011dfc 100644
--- a/unionWith.js
+++ b/unionWith.js
@@ -28,7 +28,7 @@ var unionWith = rest(function(arrays) {
   if (isArrayLikeObject(comparator)) {
     comparator = undefined;
   }
-  return baseUniq(baseFlatten(arrays, false, true), undefined, comparator);
+  return baseUniq(baseFlatten(arrays, 1, true), undefined, comparator);
 });
 
 export default unionWith;
diff --git a/uniqueId.js b/uniqueId.js
index 71fd2cfe4..7ae814e5e 100644
--- a/uniqueId.js
+++ b/uniqueId.js
@@ -9,7 +9,7 @@ var idCounter = 0;
  * @static
  * @memberOf _
  * @category Util
- * @param {string} [prefix] The value to prefix the ID with.
+ * @param {string} [prefix=''] The value to prefix the ID with.
  * @returns {string} Returns the unique ID.
  * @example
  *
diff --git a/valuesIn.js b/valuesIn.js
index db4442246..3fa3a96f2 100644
--- a/valuesIn.js
+++ b/valuesIn.js
@@ -24,7 +24,7 @@ import keysIn from './keysIn';
  * // => [1, 2, 3] (iteration order is not guaranteed)
  */
 function valuesIn(object) {
-  return object == null ? baseValues(object, keysIn(object)) : [];
+  return object == null ? [] : baseValues(object, keysIn(object));
 }
 
 export default valuesIn;
diff --git a/wrap.js b/wrap.js
index 317ba6cbb..397f64fb2 100644
--- a/wrap.js
+++ b/wrap.js
@@ -11,7 +11,7 @@ import partial from './partial';
  * @memberOf _
  * @category Function
  * @param {*} value The value to wrap.
- * @param {Function} wrapper The wrapper function.
+ * @param {Function} [wrapper=identity] The wrapper function.
  * @returns {Function} Returns the new function.
  * @example
  *
diff --git a/wrapperAt.js b/wrapperAt.js
index 5e47385bc..0ff082544 100644
--- a/wrapperAt.js
+++ b/wrapperAt.js
@@ -26,17 +26,22 @@ import thru from './thru';
  * // => ['a', 'c']
  */
 var wrapperAt = rest(function(paths) {
-  paths = baseFlatten(paths);
+  paths = baseFlatten(paths, 1);
   var length = paths.length,
       start = length ? paths[0] : 0,
       value = this.__wrapped__,
       interceptor = function(object) { return baseAt(object, paths); };
 
-  if (length > 1 || this.__actions__.length || !(value instanceof LazyWrapper) || !isIndex(start)) {
+  if (length > 1 || this.__actions__.length ||
+      !(value instanceof LazyWrapper) || !isIndex(start)) {
     return this.thru(interceptor);
   }
   value = value.slice(start, +start + (length ? 1 : 0));
-  value.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
+  value.__actions__.push({
+    'func': thru,
+    'args': [interceptor],
+    'thisArg': undefined
+  });
   return new LodashWrapper(value, this.__chain__).thru(function(array) {
     if (length && !array.length) {
       array.push(undefined);
diff --git a/wrapperLodash.js b/wrapperLodash.js
index 1d8438612..13109783e 100644
--- a/wrapperLodash.js
+++ b/wrapperLodash.js
@@ -50,28 +50,28 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
  *
  * The chainable wrapper methods are:
- * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`,
- * `at`, `before`, `bind`, `bindAll`, `bindKey`, `chain`, `chunk`, `commit`,
- * `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`, `curry`,
- * `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`, `difference`,
+ * `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`, `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`
+ * `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`
  *
  * The wrapper methods that are **not** chainable by default are:
  * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
diff --git a/wrapperReverse.js b/wrapperReverse.js
index 86306a99b..c53c5919b 100644
--- a/wrapperReverse.js
+++ b/wrapperReverse.js
@@ -30,7 +30,11 @@ function wrapperReverse() {
       wrapped = new LazyWrapper(this);
     }
     wrapped = wrapped.reverse();
-    wrapped.__actions__.push({ 'func': thru, 'args': [reverse], 'thisArg': undefined });
+    wrapped.__actions__.push({
+      'func': thru,
+      'args': [reverse],
+      'thisArg': undefined
+    });
     return new LodashWrapper(wrapped, this.__chain__);
   }
   return this.thru(reverse);