floats default to NaN... why?

[Minas]

I agree that the default value for floats/doubles should be zero. 
It feels much more natural.

I think the problem here is that people are thinking about some 
stuff too much. D is a rather new language that wants to be 
practical. Floats defaulting to NaN is NOT practical FOR MOST 
PEOPLE when at the same time I write:

int sum;

for(...)
   sum += blah blah blah

And it works.

Having floats deaulting to a value that's un-natural for most 
people is, in my opinion, craziness. Even if that's "more" 
correct in a mathematical sense.

Please excuse my English.