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10.4 Arithmetic on poly_ints

Addition, subtraction, negation and bit inversion all work normally for poly_ints. Multiplication by a constant multiplier and left shifting by a constant shift amount also work normally. General multiplication of two poly_ints is not supported and is not useful in practice.

Other operations are only conditionally supported: the operation might succeed or might fail, depending on the inputs.

This section describes both types of operation.