I personally find it weird to treat any output in stderr as an error condition. It is very common in Unix world to use stderr not only for error messages but al

I personally find it weird to treat any output in stderr as an error condition. It is very common in Unix world to use stderr not only for error messages but also general mundane runtime logs and progress indicator messages. Moreover, programs usually define what it should output to stdout, but not necessarily to stderr. After all, exit codes and `set -e` are a thing.