The proper way to go about reporting a bug (possibly after having verified it with other people, as you did) is to run perlbug, and type/paste in your bug report. Note that I didn't check http://rt.perl.org/perlbug/ for a possible duplicate, so your bug report might duplicate some already existing open bug report.

So, in your case, do that, paste in your snippet, or better the oneliner snippet I used, add some description of what you expected to happen, and what happened, and add the link to the root node here for further reference.

perlbug will then send a mail to the perl5-porters mailing list in your name, and a bug ticket on http://rt.perl.org/perlbug/ will also be created automagically.

If all goes well, you'll either hear back directly from somebody who fixed your bug or you'll find it fixed in Perl 5.8.6 ...