Deprecate `!a == b`

[Dennis]

On Wednesday, 14 August 2024 at 15:04:13 UTC, IchorDev wrote:
> I feel like integer promotion is a much more pressing issue in 
> that department. It’s one of the few things I wish we’d just 
> bin because it’s so atrocious.

Oh, I thought the list represented things you _didn't_ want to 
see in the language. But your point is rather that D is not 
consistent about this kind of error prevention?

> And personally I’ve been screwed over by arithmetic operator 
> precedence on many occasions.

Same, which is why I often defensively parenthesize expressions 
with binary operators.

> I don’t think I said that?

My bad, I thought your `!myInt == myBool` example was based on 
something you wrote in the past.