Guido van Rossum <gu...@python.org> added the comment:
I think making NewType into a class isn't a good idea, it would be too slow. But I like issue34963 (PR 9951). So then let's do some variation on (3) -- unionable things would include all types (of course), typevars, and things that have a special attribute. We could then set that special attribute on the function returned by NewType (like PR 9951 already does for __name__ and __qualname__). What to call it? Maybe "__unionable__"? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue44642> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
