Method dual

chapter24/src/main/java/com/seaofnodes/simple/type/Type.java:295–295

()

    // The dual is pre-computed on creation and available "for free" thereafter
    Type _dual;
    public final <T extends Type> T dual() { return (T)_dual; }

    <T extends Type> T xdual() {
        return (T)new Type(switch( _type ) {