deprecate boolean evaluation of floating point and character types

[Daniel N]

On Tuesday, 30 April 2024 at 18:09:22 UTC, Richard (Rikki) Andrew 
Cattermole wrote:
> Characters are quite often compared against zero when doing 
> string handling in C without the binary expression. For this 
> reason I would not want to see this changed.
>
>
>
> Now floats on the other hand... there is no clear truthiness 
> value associated with them, unless IEEE-754 defines one (it 
> doesn't appear to for 2008 version).
>
> C23 appears to not define if a floating point type can even 
> convert to bool, although it does mention bool as not being 
> supported in multiple places.

I think the most useful conversion would be.
NaN -> false
because that corresponds to .init

Futhermore you can't simply use == to compare with NaN you need 
to call isNan(), which complicates writing generic code.