Bump to v3.10.0.

internal/arraySum.js

@@ -1,18 +1,20 @@
 define([], function() {
 
   /**
-   * A specialized version of `_.sum` for arrays without support for iteratees.
+   * A specialized version of `_.sum` for arrays without support for callback
+   * shorthands and `this` binding..
    *
    * @private
    * @param {Array} array The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
    * @returns {number} Returns the sum.
    */
-  function arraySum(array) {
+  function arraySum(array, iteratee) {
     var length = array.length,
         result = 0;
 
     while (length--) {
-      result += +array[length] || 0;
+      result += +iteratee(array[length]) || 0;
     }
     return result;
   }