On Sat, 2021-02-06 at 22:00 -0300, Luciano Ramalho wrote:
A __future__ import would make clear to all that the feature is
experimental, and maybe there could be __future__ imports for
different parts of the proposal.
That's not my understanding. My understanding is __future__ is meant for features that potentially break existing code, and allows code to opt-in in a release earlier than when it will behave that way by default. From what I can tell with this PEP, existing code can continue working the way it always has.
Paul