You'll need to get the old tests to pass, add a new test for your desired behavior, document it, add to NEWS, and add yourself to AUTHORS. See the contributor guidelines.

Thanks @Kodiologist.

However, I am not able to pass test-bare-dotted. The problem is that 'str.upper produces exactly the same expression as '(. str upper), so _dotted can't distinguish if the passed node is a function from a class (or probably also from a module) or to access the property names unless we explicitly put them into the bracket.

Yep, that's what I was talking about in the linked issue. So, unless I'm missing something, this isn't going to work.