Function decide 

pub fn decide(
    kind: &Kind,
    who: Option<Who>,
    listed: bool,
    choices: &Choices,
    ask: &Ask<'_>,
) -> Decision

Whether a notification comes now, or until when it waits. who: the sender as the address books and lists judge them (named for a name), none when nobody knows them; listed: the Always through list holds them. The blocked never, whatever their conversation says (blocked beats Always through, docs/attention.md, Q3).