I created a PR to test the PEP 580 implementation: https://github.com/python/cpython/pull/12582
However, it’s failing Windows builds on AppVeyor and Azure with
C:\projects\cpython\PCbuild\_freeze_importlib.vcxproj(130,5): error : importlib.h, importlib_external.h, importlib_zipimport.h updated. You will need to rebuild pythoncore to see the changes.
It seems to me that this is a problem with the CI build system, not with my PR (but please correct me if I’m wrong).