tie issue:

use strict;

# When array dereferencing a tied scalar it seems like
# it gets stuck.

{
    package FirstElem;

    sub TIESCALAR {
        my $class = shift;
        my ($list) = @_;

        return bless \$list => $class;
    }

    sub FETCH { ${$_[0]}->[0] }
}

my @plain = 'a' .. 'z';
my @arefs = map [ $_ ], @plain;
tie my $plain, FirstElem::, \@plain;
tie my $arefs, FirstElem::, \@arefs;

shift @plain; print $plain; # b
shift @plain; print $plain; # c
shift @plain; print $plain; # d
shift @plain; print $plain; # e

print "\n";

shift @arefs; print @$arefs; # b
shift @arefs; print @$arefs; # b, should be c
shift @arefs; print @$arefs; # b, should be d,
my $copy = $arefs; # This updates it, @$arefs is now d.
shift @arefs; print @$arefs; # d, should be e

__END__
Output:
bcde
bbbd
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