fn notification_count_futures<'a>(
services: &'a Services,
sender_user: &'a UserId,
room_id: &'a RoomId,
send: bool,
) -> (impl Future<Output = Option<UInt>> + Send + 'a, impl Future<Output = Option<UInt>> + Send + 'a, impl Future<Output = Option<BTreeMap<OwnedEventId, (u64, u64)>>> + Send + 'a)