has 'options' => (
      metaclass => 'Collection::Hash',
      is        => 'rw',
      isa       => 'HashRef[Str]',
      default   => sub { {} },
      provides  => {
          exists    => 'option_exists',
          kv        => 'options',
          get       => 'get_option',
          set       => 'set_option',
          clear     => 'clear_options',    
          accessor  => 'option', 
      },
      curries  => {
          set       => { set_quantity => [ 'quantity' ] }
      }
  );