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> In *some* implementations, "a" would get a true NaN, 
> and "c" would be zero (NaNs are not comparable to each 
> other) but in general, "a" would be nil and "c" would 
> be 1, as you found out.
> --lhf

The "in general" bit does not follow the rest of the discussion. The 
following C program get the correct answer. Lua should get the same 

#include <stdio.h>
#include <math.h>
#include <stdlib.h>

int main()
  double a = atof("NAN");
  double b = atof("NAN");
  printf( "%d %d %d %d %d %d\n",
           a<b, a<=b, a==b, a!=b, a>=b, a>b );     

$ ./t
0 0 0 1 0 0