deprecate boolean evaluation of floating point and character types

[Quirin Schroll]

On Wednesday, 1 May 2024 at 10:01:29 UTC, Nick Treleaven wrote:
> On Tuesday, 30 April 2024 at 17:01:42 UTC, Basile B. wrote:
>> Generally there is a strong correlation between default 
>> initialization and boolean evaluation to `false`.
>
> But the meaning of boolean evaluation of a number is to check 
> if it is non-zero. That is well established from C.

Without looking it up, if `x` is `-0.0`, does `!x` evaluate to 
`true` or `false`?

Hint: Negative zero compares equal to zero (`x == 0.0`), but it’s 
not zero: `x !is 0.0`.

Possibly after looking it up, does the answer make sense to you?

Even if you’re 100% sure, would you bet most D programmers get it 
right?