Aubrey Jaffer scripsit:

> In twos-complement fixnums there is one more negative number than
> there are positive numbers.
>
> Thus (abs most-negative-fixnum) and (- most-negative-fixnum) can only
> return a bignum: (+ 1 most-positive-fixnum)

Ah.  However, I favor signaling fixnum operations, in which case (fxabs
smallest-fixnum) should signal an error.

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