Top of the hour again? Time for another Rust advertisement?
The topic at hand is about preventing library users from doing things the library author didn't intended using the type system, not "what happens if a language has zero-values". Perhaps you are not able to comprehend this because you are hungry? You're not you when you are hungry. Grab a Snickers.
Don't worry, I have tried languages without zero-values. But they have nothing to do with the discussion that was taking place before the ad break. Now back to the show, you cannot prevent library consumers from doing things you don't intend without a compete type system. Rust does not have a complete type system. It leaves holes open for library consumers to do unexpected things and as such it has no relevance here. Sorry that your client's product isn't the be all and end all.
The original claim was that with go, doing certain pattern "[...] guarantees that you can never forget to validate the username through any codepath". Which is not true. It is not true, because go has its own billion-dollar-mistake called zero values.
If you go way back there was talk about that, but the discussion had long shifted to "Sometimes it's nice to work with a type system where designers of libraries can actually prevent you from writing bugs."
I get it: You were in such a rush to fill your marketing quotas that you didn't bother to read the entire thread. Maybe the lesson here is don't use HN as an advertising platform next time? You should have known better from the get go.
