Document changes made in bpo-42195

[Fidget-Spinner]

BPO	42675
Nosy	@gvanrossum, @Fidget-Spinner
PRs	bpo-42675: Document collections.abc.Callable changes #23839 [3.9] bpo-42675: Document collections.abc.Callable changes (GH-23839) #23852

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-12-20.03:38:24.490>
created_at = <Date 2020-12-18.16:38:34.538>
labels = ['3.9', '3.10', 'docs']
title = 'Document changes made in bpo-42195'
updated_at = <Date 2020-12-20.03:38:24.490>
user = 'https://github.com/Fidget-Spinner'

bugs.python.org fields:

activity = <Date 2020-12-20.03:38:24.490>
actor = 'kj'
assignee = 'docs@python'
closed = True
closed_date = <Date 2020-12-20.03:38:24.490>
closer = 'kj'
components = ['Documentation']
creation = <Date 2020-12-18.16:38:34.538>
creator = 'kj'
dependencies = []
files = []
hgrepos = []
issue_num = 42675
keywords = ['patch']
message_count = 4.0
messages = ['383304', '383310', '383406', '383407']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'docs@python', 'kj']
pr_nums = ['23839', '23852']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42675'
versions = ['Python 3.9', 'Python 3.10']

[Fidget-Spinner]

A whatsnew is probably needed as this change causes backwards incompatibility in some code working with Python 3.9.0 and 3.9.1. I think the patch for Python 3.9.2 should mention that a DeprecationWarning is emitted for some invalid use cases, which will eventually become a TypeError.

[gvanrossum]

New changeset d75f6f7 by kj in branch 'master':
bpo-42675: Document collections.abc.Callable changes (GH-23839)
d75f6f7

[gvanrossum]

New changeset 597ebc8 by kj in branch '3.9':
[3.9] bpo-42675: Document collections.abc.Callable changes (GH-23839) (bpo-23852)
597ebc8

[gvanrossum]

Can this be closed now?