float init 0 request

[Walter Bright]

Thank you for your thoughts on this. It would be even better if there was a 
value that would cause an error immediately upon use. We do have that for 
pointers! But we don't for floating point (signalling NaNs were discussed 
elsewhere), so we just have to do our best.

BTW, the reason ints default initialize to zero is there is no value we can use 
as an invalid integer value. Some have proposed int.min, but nothing stops 
int.min from being part of a calculation and the result is no longer int.min so 
it is likely far more trouble than it's worth.

Designing a programming language is full of compromises. We just have to do the 
best we can.

Unlike C, which uses chars as integer types, D has a distinct char type. And so 
we can use the "invalid char value", or 0xFF, as its default initializer.