There's no enforced contract for a particular type, but a way to create entirely new values that have no relation to any existing value. I.e. you compare a valu

There's no enforced contract for a particular type, but a way to create entirely new values that have no relation to any existing value. I.e. you compare a value to MyEnum.SpecialUndefined and are sure that no None or 0 will yield True. OTOH, if someone would be determined to create a thing with the same conceptual sense as SpecialUndefined, he could explicitly define that it is Equal to MyEnum.SpecialUndefined.