__PACKAGE__->reflect->addSlot(
        tt_data           => {},
        perl_data         => {},
    );

##</code><code>##

$self->perl_data->{pass_around} = 'some calculated data';
$self->tt_data->{some_stuff} = $self->get_some_stuff();
if ( $self->perl_data->{pass_around} ){
    blah