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  1. or download this
        has pizza => (
        is     => 'ro',
        isa    => 'Pizza',
        writer => '_pizza',
    );
  2. or download this
        has 'pizza' , 
        is     => 'ro',
        isa    => 'Pizza',
        writer => '_pizza',
    ;
  3. or download this
        has pizza => {
        is     => 'ro',
        isa    => 'Pizza',
        writer => '_pizza',
    };