0.8.6.15:

0.8.6.15:
        Yay PFD real tests!
        ... REHASH-THRESHOLD may be specified to be of type (REAL 0 1)
                [ aside: (REAL (0) 1) would be much preferred for
                aesthetic reasons ] but we'd better not divide by it
                unconditionally, because otherwise confusion ensues
        ... define a constant below which we shall not go