A pet hate of mine

I know a few people who will strongly disagree with me on this, but it's something that I absolutely hate seeing in computer systems.. Its Nullable Booleans...... Booleans represent two states, true, false.. They do not represent "Unknown" or anything else you might possibly find. If you need a third state, use something else.. an enumeration or something that carries the meaning of the "extra" state with it.