* os.pipe and serialization (pickle or whatever): https://peps.python.org/pep-0554/#synchronize-using-an-os-pi...
* immortal object, but I don't see a way to create immortal object from Python (only from C). https://engineering.fb.com/2023/08/15/developer-tools/immort...
I guess it will more iteration to get a better way to communicate between the interpreters.