I have to agree that at the beginning those unfortunate names (Arc, Cow) confused me more than they should, given that I know perfectly well what Copy on Write

I have to agree that at the beginning those unfortunate names (Arc, Cow) confused me more than they should, given that I know perfectly well what Copy on Write and reference count means. If only it was spelled CoW and ARC I would very quickly grasp it (probably). But it's an extremely minor inconvenience and arguably makes the whole thing very memorable