Vinay Sajip <vinay_sajip@yahoo.co.uk> added the comment: New changeset eb9ba2f66df2195a9c6295e73ab3d545a1445f05 by Vinay Sajip (Miss Islington (bot)) in branch '3.8': bpo-16575: Disabled checks for union types being passed by value. (GH-17960) (GH-17964) https://github.com/python/cpython/commit/eb9ba2f66df2195a9c6295e73ab3d545a14... ---------- _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue16575> _______________________________________