On Thu, 31 Oct 2019 at 23:20, Nick Coghlan <ncoghlan@gmail.com> wrote:

It's not enough to move the typing classes, I must move functools.lru_cache() and dependencies, collections.abs.Mapping and dependencies, and track the frame level.

It's too big for me.

It's certainly not an easy project to tackle.

For some of the specific points you raise though, you wouldn't translate the existing Python code directly to C.
I agree with Nick, this is indeed big, but not impossible. If you are not sure yet whether you will work on implementation, you can focus on polishing the PEP text, and then if it is accepted and you will decide to give implementation to someone else, we will find a volunteer.