bpo-44662: Add ability to annotate types.Union (GH-27214) (GH-27461)

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
(cherry picked from commit 8182c8329c709f42218a8a17d81639ece5b7b627)

Co-authored-by: Yurii Karabas <1998uriyyo@gmail.com>
3 files changed