commit b42eee78e7651693aa38c390f577e5d499dcf55d
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Tue Jul 13 21:55:45 2021 -0700
committer GitHub <noreply@github.com> Tue Jul 13 21:55:45 2021 -0700
tree e62a9959655eea8d452340750a1f3fbbfb2ba021
parent bb260c2a212aee2a7d7a32bf5208fd554bf72713

bpo-44606: Fix __instancecheck__ and __subclasscheck__ for the union type. (GH-27120)


* Fix issubclass() for None.
  E.g. issubclass(type(None), int | None) returns now True.
* Fix issubclass() for virtual subclasses.
  E.g. issubclass(dict, int | collections.abc.Mapping) returns now True.
* Fix crash in isinstance() if the check for one of items raises exception.
(cherry picked from commit 81989058de381108dfd0a4255b93d4fb34417002)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>