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Per Bothner <per@xxxxxxxxxxx> writes: > Taylor Campbell wrote: >> Coercion to integers of a given modulus, for >> example, from other integers, is accomplished with a procedure we >> already have in R5RS, namely MODULO; > > Not the same. The coercion creates a value with a different run-time > type, such that the generic + operator uses modulo arithmetic. Can you coerce to fixnum a number which is bigger than maxint, and reliably get modulus, or would that coercion be an error?