Re^2: Some "combined assignment operators" are exempt from "uninitialized value" warning. Is it documented anywhere?

Here's one case where it won't be zero (undef instead), but it isn't very useful.

>perl -e "use warnings; my @nums = (); my $prod; $prod *= $_ for @nums
+; print $prod"
Use of uninitialized value $prod in print at -e line 1.
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