[issue43224] Add support for PEP 646

[Matthew Rahtz]

Matthew Rahtz <matthew.rahtz at gmail.com> added the comment:

> 1. Finish writing docs

Done once https://github.com/python/cpython/pull/32103 is merged.

> 2. Implement support for pickling of unpacked native tuples

Done once https://github.com/python/cpython/pull/32159 is merged.

4. Resolve the issue of how we implement type substitution (https://bugs.python.org/issue47006)

Will re-visit this now.

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