We use the tp_version field of class objects for quite a few of our optimizations, so it gets set for almost classes.
If we pre-allocate the version for common classes, like int, float, tuple, etc, then we can use the version number to speedup dispatching by class in a few cases:

Examples:

• BIN_OP and COMPARE_OP specialization for common-ish types like int + float
• Specialization of other ops like COMPARE_OP
• Reducing the overhead of traversing objects in the garbage collector
• Possible performance improvements to marshal and pickle.

We could add these version numbers when implementing any of the above the features, but I'm proposing adding separately to keep the size of the PR down and easier to review

Linked PRs

• GH-126547: Pre-assign version numbers for a few common classes #126551