code: protected function invokeConfigurator($configurator)
  	{
  		if (is_callable($configurator)) {
  			call_user_func($configurator, $this);
  			return;
  		}
  
  		if (is_string($configurator)) {
  			$configurator = $this->container->resolve($configurator);
  		}
  
  		if ($configurator instanceof ConfiguratorInterface) {
  			$configurator->configure();
  		} else {
  			throw new \UnexpectedValueException('Invalid configurator');
  		}
  	}
docs: Invoke a single configurator.
  
  @param  callable|string|ConfiguratorInterface $configurator
  
  @return void