[issue44914] tp_version_tag is not unique when test runs with -R :

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

Thanks for putting in the effort to find this.

I think the first step to fixing this is to formalize the semantics of `tp_version_tag`. Initially it was designed just for the method cache, but we have started using it as a unique identifier for the state of a class.
The two different uses have different requirements when the global version counter overflows. Possibly in other scenarios as well.

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