> The human brain, impressive as it is, grinds to a halt when parsing with double negatives. Things like this sound like: "I have this characteristic, therefor

> The human brain, impressive as it is, grinds to a halt when parsing with double negatives. Things like this sound like: "I have this characteristic, therefore everyone has this characteristic." Some of us ain't got no problem with double negatives, and often find that "unless" tightens up code nicely, especially for single negatives.