> This sentence blew my stack.

Please excuse me for weaponizing and deplopying bad english upon you. I can't really promise it won't happen again... ;-)

> How about

Yes, thanks. Fixed patch attached.

> Would it  make sense to document that?

I don't think so. It's kind of harmless, and the docstring for display-line-numbers-Nth-line already says that it takes precedence.

But if you feel strongly about it, please suggest a wording and I'll add it.