[Cfp-interest 1861] SNAN <math.h>

[Fred J. Tydeman]

C23 F.2.1 has

  The SNANF, SNAN, and SNANL macros in <math.h> provide designations
  for IEC 60559 signaling NaNs.

I assume that should be changed to <float.h>
And should the DEC32_SNAN... also be mentioned.

---
Fred J. Tydeman        Tydeman Consulting
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