Bug report

Bug description:

The PyCell_GET and PyCell_SET macros are not safe for free-threading builds. First, they don't the correct locking. Second, PyCell_GET returns a borrowed reference.

For CPython internals, the usages of these macros can be replaced (either with PyCell_GetRef(), PyCell_SetTakeRef(), or similar). For external API users, these macros will need to be marked as deprecated, at least for free-threaded builds.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-127271: Replace use of PyCell_GET/SET #127272
• gh-127271: Remove the PyCell_Get usage for framelocalsproxy #130383