Add support for PEP 646

[mrahtz]

BPO	43224
Nosy	@gvanrossum, @serhiy-storchaka, @JelleZijlstra, @lysnikolaou, @pablogsal, @Fidget-Spinner, @mrahtz, @mrahtz, @AlexWaygood, @cdce8p
PRs	bpo-43224: Initial implementation of PEP 646 in typing.py #24527 bpo-43224: Draft implementation of PEP 646 #30398 bpo-43224: Implement PEP 646 grammar changes #31018 bpo-43224: Implement PEP 646 changes to genericaliasobject.c #31019 bpo-43224: Implement PEP 646 changes to typing.py #31021 bpo-43224: Implement substitution of unpacked TypeVarTuple #31800 bpo-43224: Work around substitution of unpacked TypeVarTuple #31804 bpo-43224: Implement substitution of unpacked TypeVarTuple in C #31828 bpo-43224: Add more tests for typevar substitution #31844 bpo-43224: Fix Tuple[()].__args__ #31845 bpo-43224: Add tests for TypeVarTuple substitution in Annotated #31846 bpo-43224: Add TypeVarTuple.__name__ #31954 bpo-43224: Unpack concrete tuple types into a sequence of types #32030 bpo-43224: Forbid TypeVar substitution with Unpack #32031 bpo-43224: Implement pickling of TypeVarTuples #32119 bpo-43224: Add tests for pickling and copying of unpacked native tuple #32159

^{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 = None
created_at = <Date 2021-02-14.17:21:47.204>
labels = ['interpreter-core', 'tests', 'library', '3.11']
title = 'Add support for PEP 646'
updated_at = <Date 2022-04-05.02:52:50.682>
user = 'https://github.com/mrahtz'

bugs.python.org fields:

activity = <Date 2022-04-05.02:52:50.682>
actor = 'JelleZijlstra'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'Tests', 'Parser']
creation = <Date 2021-02-14.17:21:47.204>
creator = 'mrahtz'
dependencies = []
files = []
hgrepos = []
issue_num = 43224
keywords = ['patch']
message_count = 9.0
messages = ['414715', '414935', '414991', '415514', '416020', '416022', '416074', '416689', '416727']
nosy_count = 10.0
nosy_names = ['gvanrossum', 'serhiy.storchaka', 'JelleZijlstra', 'lys.nikolaou', 'pablogsal', 'kj', 'matthew.rahtz', 'mrahtz', 'AlexWaygood', 'cdce8p']
pr_nums = ['24527', '30398', '31018', '31019', '31021', '31800', '31804', '31828', '31844', '31845', '31846', '31954', '32030', '32031', '32119', '32159']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue43224'
versions = ['Python 3.11']

[JelleZijlstra]

New changeset 7a793a3 by Matthew Rahtz in branch 'main':
bpo-43224: Implement PEP-646 changes to typing.py (GH-31021)
7a793a3

[serhiy-storchaka]

New changeset 5b1b9ea by Serhiy Storchaka in branch 'main':
bpo-43224: Implement substitution of unpacked TypeVarTuple (GH-31800)
5b1b9ea