> Rc is the non-reference counted version and Arc is the atomically reference counted version. Typo here I think Steve, Rc is reference counted, but it's not a

> Rc is the non-reference counted version and Arc is the atomically reference counted version. Typo here I think Steve, Rc is reference counted, but it's not atomically reference counted. Hence the lack of an A. You've managed to instead say that it's not reference counted.