(Éric, I'd reply in the review if reitveld recognized my current username -- see http://psf.upfronthosting.co.za/roundup/meta/issue402. FYI, I also did not get an email for your review, which is likely related to that issue.)
Regarding __all__, I didn't realize that about being a tuple. I'll fix it.
As to the "dm" in the SOABI value, that is definitely something we'll have to factor in. There are actually a few such places in the current patch that rely on problematic data. It's either hidden in C or not available during bootstrapping. That's something we'll have to iron out before the solution for this issue gets committed.