msgpack backup
msgpack 已被删除，原因为：举报 #21144。
由作者提交的申诉：
the script is just a library to encode data, which is exactly what msgpack is for (license is specified in the description, but i just added the @license meta key)
管理员通过了此申诉，并解除了该则脚本的删除状态。
