I had formed my opinion at Barry's email very early. I favor not backporting too. This is a new class and we cannot control people expectations.

We are going to have yearly release cycles that is another reason not to backport this, and only move forward.

On Mon, Oct 26, 2020 at 12:34 PM Brandt Bucher <brandtbucher@gmail.com> wrote:

Brett Cannon wrote:
> Our lesson from our "innocuous" addition of booleans makes me leery of anything that tweaks the API such that it isn't compatible in the same feature release.

Agreed. I'm not 100% sure of the context, but were a few typing module additions a while back that made CI a bit of a pain (needing to pin some jobs to specific CPython bugfix releases, which isn't trivial to do across providers and platforms).

This can probably just be "another reason why 3.10 is better than 3.9", right?
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