I'm not sure about the patch - sure, the messages might go away, but I find it concerning that the assertions are failing to begin with. Of course, it only happens when in debug (and this might be a non-issue in practice, I haven't checked), but shouldn't we fix this in the C code? As I understand it though, that part of code is out of Python's control, so there might not be much we can do...

But I'm probably overthinking everything again ;)