So siehts ganz gut aus !

node_modules/es5-ext/array/#/contains.js

@@ -0,0 +1,7 @@
+"use strict";
+
+var indexOf = require("./e-index-of");
+
+module.exports = function (searchElement/*, position*/) {
+	return indexOf.call(this, searchElement, arguments[1]) > -1;
+};