[erikb]

Thanks for providing additional information. What do you do about the user of your tool having another point of view than you? For instance look at the helm example I provided. You may start a network call to IPv6 first, and when it fails (with an error, which is correct) you continue with IPv4. If either one of these works for your user there is no error. At best there is a warning scenario where you want to educate him about finally switching to IPv6. But if you report a connection error in almost any scenario that would be a bug in your code, because the connection didn't error. You did a test which failed which was expected by your code and handled correctly.