public static function forever($key, $data)
    {
        if (is_callable($data)) {
            $content = $data();
        } else {
            $content = $data;
        }

        $meta['__bow_meta'] = ['expire_at' => '+'];

        $meta['content'] = $content;

        return (bool) file_put_contents(
            static::makeHashFilename($key, true),
            serialize($meta)
        );
    }