FYI, Perl 5.18 will have experimental implementations of my sub, state sub and our sub. our sub is effectively the same as the existing sub keyword but can also be used to hide my sub subs, a la:
use 5.010;
our $foo = 42;
my $foo = 99;
say $foo; # says 99
our $foo; # "hides" my $foo
say $foo; # says 42
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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