On Sat, Jun 5, 2021 at 2:12 AM Serhiy Storchaka <storchaka@gmail.com> wrote:
04.06.21 12:08, Petr Viktorin пише:
> It is used, and I started the work :)
> See e.g.
> https://docs.python.org/3.10/c-api/sequence.html#c.PySequence_Concat

Great news! Several core developers (including me) tried to solve this
problem, but a large amount of work stopped us at an early stage. Glad
there is a progress.

Yes, this is indeed great news. It also brings the existence of these distinctions (between stable/public/cpython APIs) to the attention of their users, which helps building mindshare for limiting API use to the stable API. Thanks Petr for pushing this!

--Guido van Rossum (python.org/~guido)