public function v1(bool $optimize = true): string
    {
        $uuid = UuidGen::uuid1()->toString();

        if ($optimize) {
            // See: <http://jas.xyz/1ODZilT>
            $uuid = substr($uuid, 14, 4).
                substr($uuid, 9, 4).
                substr($uuid, 0, 8).
                substr($uuid, 19, 4).
                substr($uuid, 24);
        }
        return $uuid; // Possibly optimized now.
    }