I'm not even asking for that, I'm just asking for people to use the "new" APIs (they're older than some of the programmers making these mistakes), which are agn

I'm not even asking for that, I'm just asking for people to use the "new" APIs (they're older than some of the programmers making these mistakes), which are agnostic to address family. Use them even vaguely correctly and your code won't care about what address family the addresses are. Having bugs in untested functionality is understandable, but using long-deprecated known-broken APIs, or using the current ones in ways that are clearly and obviously wrong, isn't. (Also you should be using, and therefore testing, v6 at this point. But that's a separate discussion.)