#only there for the validator below which do stuff after build.
sub BUILD {}
 
has '_creative_validators' => (
    is      => 'ro',
    default => sub { [] },
);

sub register_validator {
    my ($class, $sub) = @_;
    $class->can('after')->(BUILD => sub {
        my ($self) = @_;
        push @{$self->_creative_validators}, $sub;
    });  
}