Mike McCrea

> I am a bit weary about adding this argument. It takes away possible (but completely hypothetical) ways to augment the method with a first argument. Thanks @telephon for your...

FYI, I'm not the best person to review the cpp, so it'd be great if someone could look over that.

This would be an interesting topic, @smoge, and could draw a large discussion. So probably best not to flood this PR. Maybe over on discourse?

But this does make me think that, wrt this PR, there are subclasses of `ArrayedCollection` which wouldn't need to have their full depth searched because the element types are constrained,...

I've built and tested, it appears to be working as expected. Thanks @JordanHendersonMusic and all!