NewDiskStorage::runStep

private function runStep($stepName, array $args)
{
	$step = $this->getStep($stepName);
	if(!$step)
	{
		throw new ArgumentException("Invalid step name {$stepName}");
	}

	[$object, $method] = $step;
	$reflectionMethod = new ReflectionMethod($object, $method);
	$reflectionMethod->setAccessible(true);

	return $reflectionMethod->invokeArgs($this, $args);
}