[Dlang-internal] Const or invariant key in dynamic array

[Valentino Giudice]

On Monday, 24 August 2026 at 02:11:24 UTC, Richard (Rikki) Andrew 
Cattermole wrote:
> Associative array, not a dynamic array.

You are right, of course.

I know the terminology, yet I repeated the mistake several times, 
including in the title.

My apologies.

> So basically to clarify:
>
> As long as a struct is by-value, is POD, allow mutable, 
> otherwise require immutable.

Currently to avoid the wording it is required that the index is 
mutable, if it is in the type.

What I am suggesting is that if the key is a simple value or a 
POD, then I should be able to use a constant or immutable key 
value without getting a warning, as I don't see how it can lead 
to any issue.