IOW, how would you (and Perl) tell apart Devel::Size::total_size() (version 1) from Devel::Size::total_size() (version 2)
Dunno - my impression was that the version 1 output would be put into 1 file, and that the version 2 output into a different file ... and that something like 'diff' would then be a useful tool (because it's the same big array being looked at in both instances, and the problem of differing memory addresses won't arise) ... but I could well be missing something, too.