Interfaces require casting and hurt performance, though. You could come up with `Either` types, but due to the lack of generic structs you'd have to have a who

Interfaces require casting and hurt performance, though. You could come up with `Either` types, but due to the lack of generic structs you'd have to have a whole lot of those. Interestingly, Rust has basically the same error handling idiom, but verbosity is considerably reduced by the '?' operator (previously the try! macro). When I was coding in Go, i would have loved that feature. The mind-numbing error checking in go is hugely annoying.