deprecate optional GIL Ref in function argument #3975
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This PR adjusts the GIL Refs deprecation warning machinery so that
Option<&T>emits deprecation warnings for GIL Refs in function arguments.Initially in #3847 I wasn't going to bother, but it seems worth it given that
Option<&T>is quite a common pattern and sort of has special support in PyO3 for other functionality like optional arguments.Indeed, adding this warning caught a few final GIL Refs sneaking around in our codebase 👀