Message 282447 - Python tracker
The changeset 4171cc26272c "Remove _PyObject_CallArg1() macro" fixed the initial bug report, so I now close the issue. Serhiy: If you see further enhancements, please open a new issue. Your second stack_overflow.py script is interesting, but I don't see any obvious possible changes to enhance results. Thanks Serhiy for digging into this issue ;-)