Is D floating point semantics too advanced?

[Walter Bright]

Hans-Eric Grönlund wrote:
> I've written a post on my blog wondering if the floating point
> semantics is too advanced. The problem I have with it is that I can't
> write something like this:
> 
> if (someValue == real.nan) {...}
> 
> It will never be true, which - for me - is unintuitive.

The behavior is as specified by the floating point standard IEEE 754. To 
change it would break from FORTRAN, C and C++ usage in a way that would 
silently break code that is transliterated.