Introspection.Connections
val empty : t
val bindings : t -> (Peer.t * connection) list
val find : Peer.t -> t -> connection option
val fold : (Peer.t -> connection -> 'b -> 'b) -> t -> 'b -> 'b
val iter : (Peer.t -> connection -> unit) -> t -> unit
val peers_in_topic : Topic.t -> t -> Peer.Set.t
val peers_per_topic_map : t -> Peer.Set.t Topic.Map.t