Null and NaN are different concepts with different trade-offs and different behavior when working with them. Nulls don't have special processor support[1] and

Null and NaN are different concepts with different trade-offs and different behavior when working with them. Nulls don't have special processor support[1] and are not part of a multilanguage, multiprocessor, international standard. [1]: So far as I'm aware, though I'd love to read about it if I'm wrong.