Type inference for default function / method arguments?

[Imperatorn]

On Monday, 10 May 2021 at 18:50:02 UTC, Witold Baryluk wrote:
> Hi,
>
> using D for very long time.
>
> I was working on a project, and converting bunch of optional 
> `bool` options in various functions, to use `Flag` and 
> `BitFlag`, to make it more readable, especially on a call side.

You could maybe use Variant somehow?