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fixing, flooring, ceiling,...

About a year or two ago I remember a discussion on LISP-DISCUSSION
about the various rounding functions, and a suggestion that someone
implement the set for MacLisp.  There was a standard (IEEE ?) that
specified them.  Was this ever done?

To remind - round towards zero      : fix
          - round towards -infinity : floor
          - round towards +infinity : ceiling
          - round away from zero    : <I forget this one.>