Boo to you. I've up-streamed patches to scipy and a few other python packages. Nobody ever said no to genuine high quality bug reports that were coupled with good fixes. Not saying that will happen every time, but if you're unsure, ask how receptive they are.
I've upstreamed patches too and I increasingly feel like it's a waste of time and that it requires far more effort than it's worth. Good maintainers who work with you are rare. I remember the ones who do.
> Nobody ever said no to genuine high quality bug reports that were coupled with good fixes.
Uhuh.
> ask how receptive they are
Doesn't really help much. It's entirely possible for people to tell you it's fine then change their minds after you actually do it and send the code in. Seriously hope you never have to experience anything of the sort.