https://www.python.org/dev/peps/pep-0563/ https://www.python.org/dev/peps/pep-0563/ was to become the default in Python 4, but that has been changed to 3.10 (se

https://www.python.org/dev/peps/pep-0563/ https://www.python.org/dev/peps/pep-0563/ was to become the default in Python 4, but that has been changed to 3.10 (see https://github.com/python/peps/commit/f1c3a99ad5df574489e877c0456c0c714b507357 https://github.com/python/peps/commit/f1c3a99ad5df574489e877..., https://bugs.python.org/issue38605 https://bugs.python.org/issue38605)