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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  
serious code.