static function ByValue($value)
    {
        $calledClass = get_called_class();
        $allowed = self::AllowedClassValues($calledClass);
        if (!in_array($value, $allowed, true))
            throw new \InvalidArgumentException('Value ' . $value . ' not allowed for enum ' . $calledClass);
        
        return new $calledClass($value);
    }