So. I don't have any idea about this guy: https://rt.perl.org/rt3/Ticket/Display.html?id=116088 The commit "Make @ISA changes update overloadedness," though, breaks Data::Util as seen here: http://www.cpantesters.org/cpan/report/836f8822-23c9-11e2-87e3-bc456dc38d47 Can we start with figuring out: * is this a bug in perl * ...or a bug in Data::Util? -- rjbs