c:\@Work\Perl\monks>perl -wMstrict -MData::Dumper -le
"my @b;
 $#b = 4;
 ;;
 $_ = 5 for @b;
 print Dumper \@b;
 ;;
 my @c;
 $#c = 4;
 $c[ $#c ] = undef;
 ;;
 $_ = 6 for @c;
 print Dumper \@c;
"
$VAR1 = [
          5,
          5,
          5,
          5,
          5
        ];

$VAR1 = [
          6,
          6,
          6,
          6,
          6
        ];