I had to Google to find the tid bit that I read about Perl years ago. I think this will affect iteration order of dicts.

    > Nov 22, 2012 — Perl 5.18 will introduce per process hash randomization and almost certainly will feature a new hash function.

it probably shouldn’t be a “release” thing. actually, certainly. i do wonder how many bugs would never have seen the light of day, if someone’s “set” actually turned out to be a sequence (i.e. allowed duplicate values) resulting in a debug build raising an assert.