`_PyStaticType_Dealloc` does not invalidate type version tag

[kumaraditya303]

_PyStaticType_Dealloc does not invalidate the type version tag and when the interpreter is reinitialized it still points to the old index. It should be cleared after the runtime finalization to avoid a rare case where there is a cache hit from the old index.

Found while working on https://github.com/python/cpython/actions/runs/4112993949/jobs/7098592004

Linked PRs

• GH-101696: invalidate type version tag in _PyStaticType_Dealloc  #101697
• [3.11] GH-101696: invalidate type version tag in _PyStaticType_Dealloc (GH-101697) #101722
• gh-101696: Make sure immutable types have a valid version tag #101742

[kumaraditya303]

I'll file PR shortly.

cc @ericsnowcurrently @erlend-aasland

[erlend-aasland]

Good job debugging that! 👏🏻👏🏻👏🏻

[markshannon]

Given that static types should be immutable and immortal, I think a better approach would be reserve low values (up to a 1000 or so) for static classes. Once allocated, a static type would keep the same version number for the lifetime of the process.

It might be handy to pre-allocate a few values for the most common types, but that's not necessary for correctness.