[Galanwe]

>> reference counting is not intrusive in CPython (meaning the reference counting structures are outside the PyObject, last I checked)

> That's wrong. That was never the case.

You are right, I was mistaken.

The point stands though, PyObjects are not really an issue for use cases where these tricks are needed.

> I was thinking more about a plain fork, like this

Right well you can recreate a multiprocessing pool of your own with different pros and cons, sure, that's an other approach I guess.