> Also, do note that purge/gc after wiping can still be a regular gc
> pass unless the module has been wiped. The gc could be triggered by
> another module being wiped.

That said, I welcome any suggestions to improve things. The ultimate
reasons we need to purge some modules are the same two reasons I
indicated on python-dev: C extension modules are almost immortal;
and some C code keeps references alive too long.

Do you agree that this patch is ok and we should address those two
problems in separate new issues?