I already had to get special permission for him to check out chapter books at all. (His teacher did that for me.) Last year, he wasn't allowed to check out books, period. (Kindergarteners can't.)
I know this sounds kind of gross, but teachers at the school knows DS at this point. The music teacher suggested he skip a grade--the music teacher. He is an innocent, talkative extrovert who makes his abilities obvious. To say this to him suggests that this is the kind of adult who wants to bring kids down a peg or who just does not believe giftedness is a thing.
The teacher has let slip a few comments regarding this librarian. It's sad. Librarians are my favorite kind of people, usually.