Add negation as a primitive unop. #2188
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Previously -x was defined as 0-x, but this is wrong when x==0. This commit also consolidates numerical and logical negation, so there is no longer a 'not' unop.
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Previously -x was defined as 0-x, but this is wrong when x==-0.
This commit also consolidates numerical and logical negation, so there is no longer a 'not' unop.