Comment 3 for bug 744812

While I did advise against linking Light and Medium in this way
originally, that was entirely on user-confusion grounds - I certainly
expected it to actually work.

I think Paul's initial reading is right - applications (possibly font
subsystems) are mixing their interpretations of preferred naming, weight
flags, and basic style flags. We've tested on preferred-name-aware
applications (InDesign, for example) and a various legacy-name-using
applications without problem.

The simple fix is to untie the Light and Medium, but a better fix would
be to get the preferred name support as good as it is on other platforms
and applications. As a user I'd definitely prefer the latter.

Dave