Bump to v4.13.0.

_isMaskable.js

@@ -0,0 +1,13 @@
+define(['./_coreJsData', './isFunction', './stubFalse'], function(coreJsData, isFunction, stubFalse) {
+
+  /**
+   * Checks if `func` is capable of being masked.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
+   */
+  var isMaskable = !coreJsData ? stubFalse : isFunction;
+
+  return isMaskable;
+});