public static function serialize(SerializationStreamWriter $streamWriter, $instance)
 {
     $streamWriter->writeInt($instance->count());
     foreach ($instance->keys() as $key) {
         $streamWriter->writeObject(Classes::toObject($key));
         $streamWriter->writeObject(Classes::toObject($instance->get($key)));
     }
     /*foreach ($instance as $key => $value) {
     			$streamWriter->writeObject($key);
     		$streamWriter->writeObject($value);
     		}*/
 }