__instancecheck__ being checked on type(cls) instead... | python/cpython

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BPO	45791
Nosy	@gvanrossum, @rhettinger, @benjaminp, @serhiy-storchaka, @brandtbucher
PRs	python/cpython#29540

^{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 2021-11-12.05:01:11.036>
labels = ['interpreter-core', '3.9', '3.10', '3.11']
title = '__instancecheck__ being checked on type(cls) instead of cls'
updated_at = <Date 2021-11-13.15:44:36.246>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2021-11-13.15:44:36.246>
actor = 'brandtbucher'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2021-11-12.05:01:11.036>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 45791
keywords = ['patch']
message_count = 11.0
messages = ['406187', '406191', '406193', '406219', '406222', '406226', '406227', '406229', '406230', '406237', '406245']
nosy_count = 5.0
nosy_names = ['gvanrossum', 'rhettinger', 'benjamin.peterson', 'serhiy.storchaka', 'brandtbucher']
pr_nums = ['29540']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue45791'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

Review python/cpython#29540 and the BPO 45791 discussion first; the issue names no source files or tests. Done means resolving the reported instancecheck lookup issue and completing the corresponding patch review.

Written by the indexing model from the issue text.

instancecheck being checked on type(cls) instead of cls

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__instancecheck__ being checked on type(cls) instead of cls