gh-107253: Use Py_T_OBJECT_EX instead of _Py_T_OBJECT by serhiy-storchaka · Pull Request #107254 · python/cpython

This is a behaviour change. It may break existing users.
It's OK to do the change in individual cases where the existing behaviour is problematic, but changing all the occurrences is just asking for trouble.
These are the cases that don't break tests, but IMO in many cases that means the tests are inadequate :)

Would you be OK closing this?