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sub oddDigitSum {
    my @signed_integers_to_work_on = @_;
...

    for (@signed_integers_to_work_on) {
        ...

sub oddDigitSum {
    my @supplied_signed_integers = @_;
...
        if ($signed_int !~ /^-?\d+$/) {
            die "Parameter '$signed_int' isn't a signed integer";
            ...