I think the key item in your post is Apache 2.0 - isn't it still a bit buggy? Anyways, warnings such as the one you encountered are trivial and usually more of a burden to fix than they are to ignore. However, i really feel compelled to have warning free code, and instead of turning off strict, i would have gotten rid of the warning like so:

foreach my $record (@records) {
   foreach my $key (keys %$record) {
      my $val = $record->{$key} || '';
      print "$key:$val";
      print $q->br;
   }
}
[download]

I do know that extremely uses Apache 2.0 - he might be of help to you.

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)