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Two specific suggestions.
1. I believe that every numerical value should have an external
representation. There are many different NaNs (the only requirement
is that the biased exponent field should be a maximum and the
mantissa field be nonzero), so it should be possible to specify or
determine this information about a NaN from its external representation.
2. If Scheme really wants to get serious about floating-point
arithmetic, one should be able to specify the precision of floating-
point operations. "One-precision-fits-all" doesn't cut it for