Message 318091 - Python tracker

I agree with Victor, we shouldn't add PyObject fields that only have use in certain (minority) situations.

The idea of tracking per arena will be non-trivial to implement, as only small objects (smaller than 512 bytes) use our own allocator; larger objects go to the system allocator.

Can I ask why you're considering this?  I thought you didn't want to transfer ownership between interpreters.