interface Deno.MulticastV4MembershipUnstableRepresents membership of a IPv4 multicast group. Propertiesleave: () => Promise<void>Leaves the multicast group. setLoopback: (loopback: boolean) => Promise<void>Sets the multicast loopback option. If enabled, multicast packets will be looped back to the local socket. setTTL: (ttl: number) => Promise<void>Sets the time-to-live of outgoing multicast packets for this socket.