Implement the latest semantics for PEP 634 for matching collections

[markshannon]

BPO	43977
Nosy	@markshannon, @willingc, @miss-islington, @brandtbucher, @Fidget-Spinner
PRs	bpo-43977: Use tp_flags for collection matching #25723 bpo-43977: Document the new pattern matching type flags #25734 bpo-43977: Make sure that tp_flags for pattern matching are inherited correctly. #25813 bpo-43977: Update pattern matching language reference docs #25917 [3.10] bpo-43977: Update pattern matching language reference docs (GH-25917) #26117 bpo-43977: Properly update the tp_flags of existing subclasses when their parents are register'd #26864 [3.10] bpo-43977: Properly update the tp_flags of existing subclasses when their parents are registered (GH-26864) #26908

^{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 = 'https://github.com/markshannon'
closed_at = <Date 2021-05-02.23:39:01.006>
created_at = <Date 2021-04-29.16:33:41.839>
labels = []
title = 'Implement the latest semantics for PEP 634 for matching collections'
updated_at = <Date 2021-06-25.15:46:31.747>
user = 'https://github.com/markshannon'

bugs.python.org fields:

activity = <Date 2021-06-25.15:46:31.747>
actor = 'miss-islington'
assignee = 'Mark.Shannon'
closed = True
closed_date = <Date 2021-05-02.23:39:01.006>
closer = 'Mark.Shannon'
components = []
creation = <Date 2021-04-29.16:33:41.839>
creator = 'Mark.Shannon'
dependencies = []
files = []
hgrepos = []
issue_num = 43977
keywords = ['patch']
message_count = 7.0
messages = ['392330', '392394', '392747', '392750', '393625', '396524', '396525']
nosy_count = 5.0
nosy_names = ['Mark.Shannon', 'willingc', 'miss-islington', 'brandtbucher', 'kj']
pr_nums = ['25723', '25734', '25813', '25917', '26117', '26864', '26908']
priority = 'high'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue43977'
versions = []

[markshannon]

PEP-634 has been updated to allow a faster and more robust implementation of matching sequences and mappings: python/peps#1937

It needs to be implemented.

[markshannon]

New changeset 069e81a by Mark Shannon in branch 'master':
bpo-43977: Use tp_flags for collection matching (GH-25723)
069e81a

[brandtbucher]

New changeset 9387fac by Brandt Bucher in branch 'master':
bpo-43977: Document the new pattern matching type flags (GH-25734)
9387fac

[markshannon]

New changeset 33ec88a by Mark Shannon in branch 'master':
bpo-43977: Make sure that tp_flags for pattern matching are inherited correctly. (GH-25813)
33ec88a

[willingc]

New changeset e7d25d3 by Miss Islington (bot) in branch '3.10':
bpo-43977: Update pattern matching language reference docs (GH-25917) (GH-26117)
e7d25d3

[brandtbucher]

New changeset ca2009d by Brandt Bucher in branch 'main':
bpo-43977: Properly update the tp_flags of existing subclasses when their parents are registered (GH-26864)
ca2009d

[miss-islington]

New changeset 8897012 by Miss Islington (bot) in branch '3.10':
bpo-43977: Properly update the tp_flags of existing subclasses when their parents are registered (GH-26864)
8897012