Wrapper/Proxy Generic Type

I've been putting some work into typeshed pull requests and I've noticed some places where I could really have used a Proxy Generic class - meaning I can inherit from Proxy[T] and that means that whatever attributes T has, Proxy[T] also has. We don't want to directly mark this as inheritance since then the distinction of a proxy is lost.

The examples I ran into are ProxyType and CallableProxyType in weakref or SynchronizedBase in multiprocessing,csharedtypes.
A big one would be unittest.Mock (See https://github.com/python/mypy/issues/1188).
I'm sure other cases exist,

Advantages:

• Representing a proxy type easily
• Allowing type checkers to enforce typing

Disadvantages:

• Functions that get T won't accept Proxy[T] as an argument. Although the current state is probably something similar.

I'd really like to hear some opinions on the idea.

首先阅读提案及其讨论，包括涉及 weakref、multiprocessing.sharedctypes 和 unittest.Mock 的示例，以及链接的 mypy issue。要取得有价值的结果，需要就 Proxy[T] 是否属于 typing 设计达成一致，并对其行为作出明确规范。