Aubrey Jaffer noticed guile doesn't have r5rs numerator and
denominator and proposes the definitions below.  The head has them
already with the exact fractions now, but I think I'll add these to
the 1.6 branch.


(define (numerator q)
  (do ((num q (* 2 num)))
      ((integer? num) num)))

(define (denominator q)
  (do ((num q (* 2 num))
       (den (- q q -1) (* 2 den)))
      ((integer? num) den)))


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