SG15

This is interesting, but until now, the widespread practice has been to distribute the full source code as a separate source package, rather than in a -dev/devel one, which only contained the minimal required files, i.e. the headers. Also, I wouldn't rely on early build systems to be smart enough to not rebuild the BMI and all their dependents when you make a change in the implementation if it's in the same file as the interface.