Enjoyable article but you underestimate the freedom perl gives you to shoot yourself (or innocent bystanders) in the foot;-). You can, with some effort, declare methods in Package 0. 

use strict;
use warnings;

use 5.010_000;

my $package_0 = bless {}, '0';
{
    no strict qw(refs);
    *{'0::hello'} = sub { say 'Hello World!'; };
}

say ref $package_0;
$package_0->hello();

__END__
0
Hello World!

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In reply to Re: Reference assessment techniques and how they fail by hipowls
in thread Reference assessment techniques and how they fail by kyle

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