is(x = module) vs. __traits(isModule, x)

[Kagamin]

On Wednesday, 7 October 2020 at 18:46:07 UTC, Steven 
Schveighoffer wrote:
> Why both? The first thing that struck me is that, std.stdio is 
> NOT a type. `is` specifically says it works with types. So that 
> seems out of place (indeed the documentation does not mention 
> anything special about this).

Guess, it's a bit of pl theory, I saw mentioned somewhere that 
modules count as types. Not sure about packages though.