I'm not sure what you mean by bounded. There's `dyn Error` that lets you unify all error types. You can also make functions generic over the error type. Places

I'm not sure what you mean by bounded. There's `dyn Error` that lets you unify all error types. You can also make functions generic over the error type. Places where people use precise concrete error types are not forced by the language, it's just the best practice for libraries.