I've just released Class::Meta 0.46. It now requires Perl 5.6.1 instead of Perl 5.8.0. I had to disable some tests for 5.6, though, because Carp doesn't support @CARP_NOT in perl 5.6. Everything should work fine, though. All tests passed for me. Perl 5.6.0 seems to be right out, though.