I don't keep up on new developments in English grammar. I'm not even up to speed on old developments. But there is one thing that I do differently than everyone else, on purpose, and I'll argue here that it isn't wrong. It's about quotes and punctuation.
My argument is that quote marks indicate that the content between the marks is accurately represented exactly as someone else said, or exactly as you should reproduce it in the future. Therefore, the punctuation that exists for purposes of sentence structure, and is not part of the quote, belongs OUTSIDE the quotes, not inside.
I agree that this post is not informative, and is boring, but I want you all to know that I'm doing it on purpose. It is a choice; it is not born from ignorance.
So now you know that all the rest of my grammar errors are just that - ignorant errors. This particular one, however, is not an error - it's me being right against the crushing weight of the rest of the world.