So siehts ganz gut aus !

node_modules/core-js/modules/_iter-create.js

@@ -0,0 +1,13 @@
+'use strict';
+var create = require('./_object-create');
+var descriptor = require('./_property-desc');
+var setToStringTag = require('./_set-to-string-tag');
+var IteratorPrototype = {};
+
+// 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
+require('./_hide')(IteratorPrototype, require('./_wks')('iterator'), function () { return this; });
+
+module.exports = function (Constructor, NAME, next) {
+  Constructor.prototype = create(IteratorPrototype, { next: descriptor(1, next) });
+  setToStringTag(Constructor, NAME + ' Iterator');
+};