public function offsetGet($name)
    {
        $data = [];
        if (!isset($this->_hashes[$name])) {
            throw new RuntimeException("Unexisting Set-Cookie `'{$name}'`.");
        }
        foreach ($this->_hashes[$name] as $key => $hash) {
            $data[] = $this->_data[$hash];
        }
        return $data;
    }