Function asked_about

pub fn asked_about(catalog: &Catalog, held: &Sources) -> usize

How many artists on the shelf have been asked about at all.

The denominator behind every message here. “No country matches” means one thing in a library that has been fetched and quite another in one that has not, and a reader shown the same sentence for both learns nothing — the same distinction the cover pass had to be taught four times over.