All generally good advice, but for the constructors in the children, I'd prefer:
sub new
{
my ($class, %params) = @_;
my $self = $class->SUPER::new(%params);
$self->{block_name} = $params{'block name'};
return $self;
}
This ensures that the parent constructor is called as a method (and thus obeys inheritance).
There's no need to re-bless $self.
package Cow { use Moo; has name => (is => 'lazy', default => sub { 'Mooington' }) } say Cow->new->name
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