[Issue 366] Adding trailing zeros to a real literal makes it smaller!

[Walter Bright]

Don Clugston wrote:
> It's the first step (decimal rounding) that appears to be missing.
> I don't know how much of a change this is from IEEE 754. Without 
> monotonicity, you need to be very careful about increasing the precision 
> of constants.

Might as well leave it as a bug, then, although the issue is with 
strtold which the D lexer relies on.