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Two specific suggestions.

This page is part of the web mail archives of SRFI 70 from before July 7th, 2015. The new archives for SRFI 70 contain all messages, not just those from before July 7th, 2015.

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.