Why maintain 1.9.1 at all? I don't see the benefit. People need to
upgrade to 1.9.2, and soon 1.9.3. "1.9.x" should be considered "long
term maintenance", not "1.9.1.x", et al.

Of course, 1.8.7 is different b/c it is so incompatible with 1.8.6
--but I think most agree that was a failure of version bumping (b/c
matz did not want a "1.10.x" series).