Ticket #26438: 26438.patch

src/wp-includes/js/customize-base.js

@@ -255 +255 @@
 
                 /**
                  * Internal recursive comparison function for `isEqual`.
-                 * Copied from Underscore.js.
+                 * Modified version from Underscore.js v1.5.2.
                  */
                 /* jshint ignore:start */
                 _eq: function(a, b, aStack, bStack) {
                         if (a === b) return a !== 0 || 1 / a == 1 / b;
                         if (a == null || b == null) return a === b;
 
-                        var className = toString.call(a);
-                        if (className != toString.call(b)) return false;
+                        var className = Object.prototype.toString.call(a);
+                        if (className != Object.prototype.toString.call(b)) return false;
                         switch (className) {
                                 case '[object String]':
                                         return a == String(b);