Booleans are already considered integers with value 0 or 1, so it’s
natural to expect negated booleans to be considered integers with
value 1 or 0.
This makes it more convenient to define an antisymmetric array of
booleans: you no longer have to choose between not being able to use
greater[j, i] = greater[i, j].Not() in linear expressions and not
being able to use greater[j, i] = 1 - greater[i, j] in boolean
constraints.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
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