[issue43224] Add support for PEP 646

[Jelle Zijlstra]

Jelle Zijlstra <jelle.zijlstra at gmail.com> added the comment:

> 1. Finish writing docs (is updating library/typing.html sufficient? https://github.com/python/cpython/pull/32103)

We also need to add to the What's New for 3.11. I volunteered to do that for all the typing PEPs.

> 2. Implement support for pickling of unpacked native tuples

Linking your GH-32119

> 3. Implement support and add tests for copy() of TypeVarTuple and unpacked tuple

I believe this uses the same mechanism as pickling, so shouldn't need more work.

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