This gives almost 4% performance boost (Python 3.12, compiled). Note there is an old bug in type_object_type(), we treat not ready types as Any without deferring, I disable caching in this case.

Unfortunately, using this in fine-grained mode is tricky, essentially I have three options:

• Use some horrible hacks to invalidate cache when needed
• Add (expensive) class target dependency from __init__/__new__
• Only allow constructor caching during initial load, but disable it in fine-grained increments

I decided to choose the last option. I think it has the best balance complexity/benefits.