Moose doesn't have to be backwards compatible, and quite frankly it is stupid perl is to such an ape shit insane extent - especially being Perl 6's state. If you use Moose, the package that includes Moose should use 5.10 features. It is the very job of Moose's to eliminate cruft, after all -- it's just regular perl code, that makes perl more bearable. Having to tell Perl your code isn't retardedly esoteric, and thus can use new features, is surely an easy target for Moose. And v5.10 broke stuff anyway right? Without going into the minor things I'm sure it broke, it removed the deprecated pseudohashes...
IIRC the strongest reason to keep Moose out of the CORE amongst other stupid modules that compete to make perl-suck-less, was that Moose wanted to develop at a higher speed than that of CORE, and that people acknowledge it might break backwards compatibility.
Every few major releases of Moose have broken something, somewhere for me. However, I waste substantially less time finding and fixing them than I did hitting my head over retarded design decisions that predate Moose. And more often than not, the new functionality Moose includes with every major release quickly laps the amount of time I waste when Moose is broken from upgrade.
Ignore those that would stifle development because they refuse to risk breaking compatibility. programmer_conservatives--
Evan Carroll
www.EvanCarroll.com