sub sum($$){...} # do you really need ($$) ? That is rarely useful.
Rarely useful, often misused, and in this case (in which prototypes are not checked at all) totally useless. E.g.:
>perl -wMstrict -le
"sub sum ($$);
;;
my $codes = { 'SOFT' => 'sum', 'HARD' => \&sum, };
;;
$codes->{HARD}->('HARD', 1, 2, 3, 4);
;;
{
no strict 'refs';
$codes->{SOFT}->('SOFT', 9, 8, 7, 6);
}
;;
sub sum ($$) { print qq{(@_) arguments: }, scalar @_; }
"
(HARD 1 2 3 4) arguments: 5
(SOFT 9 8 7 6) arguments: 5
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