gh-146553: Fix infinite loop in typing.get_type_hints() on circular __wrapped__

[raminfp]

#146553

• Issue: Infinite Loop in typing.get_type_hints() via Circular __wrapped__ #146553

[brianschubert]

I wonder if it would make sense to lazily import inspect here instead of having two implementations of essentially the same thing? inspect is a heavy import, but if you're calling get_type_hints you're already doing some sort of runtime signature introspection, in which case the import cost may be less of a concern.

@raminfp Please be mindful of https://devguide.python.org/getting-started/generative-ai/. I see you have been warned about relying on LLM generated PRs in the past. If you do decide to use LLMs, please make sure you take the time to scrutinize the output and compare it with the existing code before submitting a PR. In particular, you should try to match the style of the existing code (e.g. don't use _private_names for local variables).

[raminfp]

@brianschubert Thank you for the review and for pointing this out. I do use LLM assistance when working on contributions (testing, security check, design and etc), but I wasn't sufficiently familiar with the relevant stdlib methods, specifically inspect.unwrap, which led to re-implementing logic that already exists. I appreciate the feedback, and I'll make sure to do a more thorough review of existing stdlib utilities before submitting patches in the future.