Izmjenjena struktura, dodan backand

web/node_modules/core-js/modules/$.collection-to-json.js

@@ -0,0 +1,11 @@
+// https://github.com/DavidBruant/Map-Set.prototype.toJSON
+var forOf   = require('./$.for-of')
+  , classof = require('./$.classof');
+module.exports = function(NAME){
+  return function toJSON(){
+    if(classof(this) != NAME)throw TypeError(NAME + "#toJSON isn't generic");
+    var arr = [];
+    forOf(this, false, arr.push, arr);
+    return arr;
+  };
+};