Izmjenjena struktura, dodan backand

web/node_modules/core-js/modules/es6.object.seal.js

@@ -0,0 +1,8 @@
+// 19.1.2.17 Object.seal(O)
+var isObject = require('./$.is-object');
+
+require('./$.object-sap')('seal', function($seal){
+  return function seal(it){
+    return $seal && isObject(it) ? $seal(it) : it;
+  };
+});