It's always worth pointing out this mistake, especially somewhere like perlmonks where the code is archived and someone will read and copy it months or years later.

You're right that in many cases having multi-valued CGI parameters might not be what is required and therefore the script _should_ overwrite them. If this is the case tho', I'd hope to see a a comment saing something like "I know this looks like a bug, but it's OK because..."

I realise that a) my original post looked a bit too much like a flame (I've apologised to the original poster for this) and b) my post didn't address the problem that the original poster was having, but I think that it's important to point out potential bugs in the code on perlmonks so that people who cut and paste from here are aware of the possible traps.