Feature or enhancement

Proposal:

contextvars.Context is documented as implementing the collections.abc.Mapping interface. I believe we should register it to the abc, so an isinstance check can work.

This is similar to #126417 .

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

A small amount of prior discussion occurred in an issue for typeshed: python/typeshed#12873

Linked PRs

• gh-126451: Register contextvars.Context to collections.abc.Mapping #126452
• [3.13] gh-126451: Register contextvars.Context to collections.abc.Mapping (GH-126452) #126518
• [3.12] gh-126451: Register contextvars.Context to collections.abc.Mapping (GH-126452) #126519
• [3.13] gh-126451: Revert backports of ABC registrations for contextvars.Context and multiprocessing proxies #126734
• [3.12] gh-126451: Revert backports of ABC registrations for contextvars.Context and multiprocessing proxies #126735