public static function get($key, $default = null)
    {
        if (!static::has($key)) {
            static::$with_meta = false;

            return $default;
        }

        $cache = unserialize(file_get_contents(static::makeHashFilename($key)));

        if (!static::$with_meta) {
            unset($cache['__bow_meta']);

            $cache = $cache['content'];
        }

        return $cache;
    }