proof that I don't understand overload at all

notbenh_vs_overload.t

#!/usr/bin/perl 

use strict;
use warnings;

use Test::Most qw{no_plan};
use Carp::Always;
BEGIN{ print qq{\n} for 1..10};

#-----------------------------------------------------------------
#  
#-----------------------------------------------------------------
BEGIN {
   package My::Test;
   use Moose;
   use overload '+' => sub{ 'moo' };
   sub zing {
      my ($self,$one,$two) = @_;
      return 'cow' if $one eq 'moo';
      return $one + $two;
   }
};

my $t = My::Test->new;
is 1 + 2, 3, q{overload not exported};
is $t->zing(1,2), 'moo', q{overload is scoped correctly};
is $t->zing(1+2), 'cow', q{how I wish overload worked};

__END__

ok 1 - overload not exported
not ok 2 - overload is scoped correctly
#   Failed test 'overload is scoped correctly'
#   at /home/benh/tmp/overload.t line 25.
#          got: '3'
#     expected: 'moo'
Use of uninitialized value $two in addition (+) at /home/benh/tmp/overload.t line 19
   My::Test::zing('My::Test=HASH(0x8cb9f28)', 3) called at /home/benh/tmp/overload.t line 26
not ok 3 - how I wish overload worked
#   Failed test 'how I wish overload worked'
#   at /home/benh/tmp/overload.t line 26.
#          got: '3'
#     expected: 'cow'                                                                                                                                  
1..3
# Looks like you failed 2 tests of 3.