package MyClass;
    use Class::Multimethods::Attributes;

    sub new :multi ($class) {
        bless { name => '',
                rank => '',
                cereal_number => '',
              }, $class;
    }

    sub new :multi ($class, $name, $rank, $c_num) {
        bless { name => $name,
                rank => $rank,
                cereal_number => $cnum,
              }, $class;
    }