Function person 

fn person(
    talk: &Talk,
    who: Who,
    group: bool,
    always: bool,
    ask: &Ask<'_>,
) -> Decision

Someone’s message: now when the matrix lets them through (attention::Attention::decide: their row on its channel, a group’s own row, Always through’s, the time, its layers), the notification’s area fitting now for all but your safe people and Always through (as mail to an address for another time, docs/areas.md); else at their next time.