Wow Angular Aria looks fantastic. Even have full docs for the more complicated scenarios like autocomplete. Can't wait to get this in my hands and see if it replaces the custom screen reader autocomplete I had to make.
With that said, the autocomplete example which parent mentioned, does seem well made. Was just surprising to see such a basic mistake in the documentation for the accessibility stuff, one would think they would take extra care to get it right there, as that's what people (and LLMs...) will read and retain.