Why is Local DNS AAAA record forwarded / exposed?

How do I configure Pi-hole to return NODATA-IPv6 for the AAAA record? Or is there another way I can configure it to not forward internal names to the public internet?

EDIT: ah, will try to understand this: [SOLVED] disable AAAA response for a given domain - #8 by DL6ER

Gotta say, I'm surprised that leaking AAAA names is intentional, especially since Pi-hole considers itself authoritative (for the A record anyway). Is this described more anywhere? I'd like to learn more.

Thanks!