PEP 699: Implementation

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We can either follow what was outlined here python/peps#2927.

Or https://discuss.python.org/t/pep-699-remove-private-dict-version-field-added-in-pep-509/19724/14

Linked PRs

• gh-101152: Implement PEP 699 #101193

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This should be a somewhat straightforward C change. I recommend any new contributors looking to work on the C parts of CPython take this up :).

In short, we're deprecating usage of a struct field in CPython.