This is re-open of https://bugs.python.org/issue5945.
In the former issue, it was decided that documenting the odd behavior and later providing clean, good ABC C API would be the long term solution.
Few years passed and there are no alternatives AFAIK
I am wondering if that's due to lack of resources or just forgotten?
I don't mind contributing the necessary change in case there's really nothing in progress and it is something Python community wants to fix.
Hopefully there's an existing solution and I just didn't search well enough.