Permissions::createForUserId

static function createForUserId($userId): Permissions
{
	if(isset(self::$instances[$userId]))
	{
		return self::$instances[$userId];
	}

	$instance = new self;
	$instance->setUserId($userId);
	$instance->availableUserIds = $instance->loadAvailableUserIds();

	self::$instances[$userId] = $instance;

	return $instance;
}