Bump to v4.8.0.

chunk.js

@@ -1,4 +1,5 @@
 var baseSlice = require('./_baseSlice'),
+    isIterateeCall = require('./_isIterateeCall'),
     toInteger = require('./toInteger');
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
@@ -15,7 +16,8 @@ var nativeCeil = Math.ceil,
  * @since 3.0.0
  * @category Array
  * @param {Array} array The array to process.
- * @param {number} [size=0] The length of each chunk.
+ * @param {number} [size=1] The length of each chunk
+ * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  * @returns {Array} Returns the new array containing chunks.
  * @example
  *
@@ -25,9 +27,12 @@ var nativeCeil = Math.ceil,
  * _.chunk(['a', 'b', 'c', 'd'], 3);
  * // => [['a', 'b', 'c'], ['d']]
  */
-function chunk(array, size) {
-  size = nativeMax(toInteger(size), 0);
-
+function chunk(array, size, guard) {
+  if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
+    size = 1;
+  } else {
+    size = nativeMax(toInteger(size), 0);
+  }
   var length = array ? array.length : 0;
   if (!length || size < 1) {
     return [];