negative zero

[Shriram Krishnamurthi <shriram@cs.rice.edu>]

Hi Andre:

> (exact? -0) => #t [not only does negative zero exist, it's exact!?]

Consider:

> (eq? -0 0)
#t
> (negative? -0)
#f
> (positive? -0)
#f
> (negative? 0)
#f
> (positive? 0)
#f

'shriram