The SRFI document has several statements like (e.g., under the
description of floor/):

  Thus r is negative iff d is negative.

But in fact, r (the remainder) can be zero (which is not negative) even
if d is negative.

This is obvious, I know, but perhaps all such statements could be changed to

  Thus a nonzero r is negative iff d is negative.

On another issue, can anyone point me to a list of simple unit tests for
all these functions?

Brad