Bug report

Bug description:

I've started putting a branch together that moves all the global state into a module-level state object.

If that looks useful, I'll continue to work on it and can rebase on main.

It passes tests and "works on my machine".

I haven't looked at python internals in some time, so apologies if I'm a little rusty!

CPython versions tested on:

3.12, CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-110415: move datetime global state into module state #110420