So siehts ganz gut aus !

node_modules/core-js/modules/_set-collection-of.js

@@ -0,0 +1,12 @@
+'use strict';
+// https://tc39.github.io/proposal-setmap-offrom/
+var $export = require('./_export');
+
+module.exports = function (COLLECTION) {
+  $export($export.S, COLLECTION, { of: function of() {
+    var length = arguments.length;
+    var A = new Array(length);
+    while (length--) A[length] = arguments[length];
+    return new this(A);
+  } });
+};