https://discuss.python.org/t/c-api-how-much-private-is-the-private-py-identifier-api/29190 (2023). https://mail.python.org/archives/list/python-dev@python.org/thread ...
It states The file descriptor is not inherited by child processes. However, taking a look through https://github.com/python/cpython/blob/main/Lib/tempfile.py there ...