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> The Perl code has been running correctly for 10 years without closing file
> descriptors, so it's probably going to be just fine.

Read here:

Has been running does not necessary mean correct, might be cause umenu
was always from called from a shell with defined std streams, or you
didnt have a fd open before. This was just a friendly notice, being
one of the tricky things that work 999 of 1000 cases and in the 1
you(r user) has/have absolutely no idea what is going on.