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Or allow multiple return values like Go. EOF gets returned as an explicit error value and the io.Reader interface is standardized and widely used.

It seems weird that Go considers EOF to be an error condition. Reaching the end of a file is a normal, expected outcome of reading files.

By making error values explicit and handling them necessary, Go makes all error conditions expected outcomes.

Whether this is an advantage is heavily domain dependent.

golang's approach is inferior and error prone. We already have better designed languages.