hello! been having issues with pex and/or pants. from IRC:

011038 < _habnabit> neither pex nor pants seem to be able to include both cp27m and cp27mu ABI wheels in a single pex, and actually putting more wheels into a pex looks like the worst thing

011150 < _habnabit> how the heck are you supposed to do this

ideally i'd like to be able to make a pex that supports multiple versions/ABIs of python and/or multiple OSes, and it looks like pex doesn't have that (but there's an open PR) and pants maybe kinda supports it but it's poorly documented, and seems to choose the ABI at random without a way to specify which i want