A user/maintainer of a popular library documented their use case for accessing fields in the code object. In 3.11 the fields in C are gone but still available as properties in Python. Accessing these properties can be made faster by exposing their functions in the C API. The current option is PyObject_GetAttrString(code, "attr") which is much slower.

https://discuss.python.org/t/getting-the-class-name-of-a-code-frame-object-in-cpython-3-11-c-api/17396

A similar issue is #92154.

I am marking this as a release blocker @pablogsal as it would be mucho bueno if we could get this before rc1.