code: public function createService(ServiceLocatorInterface $serviceLocator)
      {
          $instance = $this($serviceLocator, '', $this->options);
          $this->resetCreationOptions();
  
          return $instance;
      }
docs: Create service
  
  @internal
  proxies to {@link __invoke()}
  
  @param ServiceLocatorInterface|\Zend\ServiceManager\AbstractPluginManager $serviceLocator
  
  @return CustomizableFieldsetInterface