Attached patch fix PyThread_set_key_value() instead of adding a new function.
I prefer fix_set_key_value.patch instead of pythread_set_key_value.patch because I feel bad of keeping a buggy function and having to decide between a correct and a buggy version of the same function.
> Deja vu, this has come up before. I wanted to change this because native TLS implementation become awkward.
> https://mail.python.org/pipermail/python-dev/2008-August/081847.html
You didn't get answer to this old email :-( I suppose that you still want to fix PyThread_set_key_value()?