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poly_ints ¶Addition, subtraction, negation and bit inversion all work normally forpoly_ints. Multiplication by a constant multiplier and leftshifting by a constant shift amount also work normally. Generalmultiplication of twopoly_ints is not supported and is notuseful in practice.
Other operations are only conditionally supported: the operationmight succeed or might fail, depending on the inputs.
This section describes both types of operation.