Hm, OK. I named them that way thinking that was the convention. But
sure, I'd prefer to nix the Error prefix. Ah, I think I may have got
this idea from the Notification hierarchy. Maybe?
Yeah, it goes against our instinct to name things with the noun, and other languages (eg. Java) *do* include the suffix. But I think it does produce a better effect. Notifications are a bit weird, because you often get names that reflect the use case of the exception–things like "Request."