Perl 6 changes - 2013W49 2013-12-07 Post a comment Potentially incompatible changesNiecza Perl Changed Order enum value names to match the specification. Changed KeySet to SetHash, and KeyBag to BagHash. New featuresRakudo Perl Optimization parser is now faster. bless(*) is now properly deprecated. Private role attributes are now visible in class. Perl 6 specification Add Duration object.