https://blog.wongcw.com/2022/09/21/%e6%88%9635%e8%90%ac%e8%b5%b7%e5%94%ae%e6%9c%ac%e7%94%b0%e6%80%9d%e5%9f%9ftype-r%e7%99%bd%e8%bb%8a%e8%ba%ab%e7%8f%be%e8%ba%ab%e5%9c%8b%e5%85%a7%ef%bc%9a%e5%a4%a7%e7%b4%85%e8%89%b2%e5%ba%a7%e6%a4%85/