Hi, packager here,
Ben Hoyt (author of scandir) here: note that my scandir module isn't quite ready for prime-time. It's usable, but still very much in early development. It has a couple of known issues, and I also intend to complete the fast C version. Not quite sure about a time-frame yet.
The new package won't reach Debian stable until at least 2 years, so I don't think this is a problem. In the mean time, the speed improvement brought by your module can be useful in some workflows, like the one I have to deal with currently at work. So I thought it was a good idea to propose a scandir package in Debian (and it could bring you more feedback).
Though, I will add a note about the "work-in-progress" status in the package description. And if mentors think that the package should only be in experimental for now, that's fine with me too.
Cheers, Nicolas