Send empty assoc array to function

[JN]

On Thursday, 9 July 2020 at 19:53:42 UTC, JN wrote:
> void foo(int[int] bar)
> {
>     // ...
> }
>
>
>
> Is it possible to send an empty array literal?
>
> foo( [ 0 : 2 ] ) works
> foo( [] ) doesn't
>
> int[int] empty;
> foo(empty);
> works but it's two lines

Hmm, foo(null) seems to work, but is it correct way to do it?