Izmjenjena struktura, dodan backand

web/node_modules/core-js/modules/$.own-keys.js

@@ -0,0 +1,9 @@
+// all object keys, includes non-enumerable and symbols
+var $        = require('./$')
+  , anObject = require('./$.an-object')
+  , Reflect  = require('./$.global').Reflect;
+module.exports = Reflect && Reflect.ownKeys || function ownKeys(it){
+  var keys       = $.getNames(anObject(it))
+    , getSymbols = $.getSymbols;
+  return getSymbols ? keys.concat(getSymbols(it)) : keys;
+};