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PEP 699 – Remove private dict version field added in PEP 509 | peps.python.org

https://peps.python.org/pep-0699

“PEP 509 introduced a private ma_version_tag field for dictionaries to allow optimizations in CPython and extension libraries. This PEP proposes to rescind PEP 509 and declare the field an implementation detail, as it has already been superseded by alter...” (the page’s own description)

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