Great to see this getting standardized! I maintain an error package that lets users use structured types for errors and error codes [1]. It is critical to be a

Great to see this getting standardized! I maintain an error package that lets users use structured types for errors and error codes [1]. It is critical to be able to wrap errors without information loss. I used one standard, a Causer interface, but I will be switching to Unwrap. I see complaints about stacktraces here in the comments. I recommend always using pkg/errors or some error package with stack traces. [1] https://github.com/pingcap/errcode https://github.com/pingcap/errcode