Unstable options which can be set when opening a datagram listener via
[`Deno.listenDatagram`](../././~/Deno.listenDatagram).
optional
reuseAddress: boolean = false
When `true` the specified address will be reused, even if another
process has already bound a socket on it. This effectively steals the
socket from the listener.
optional
loopback: boolean = false
When `true`, sent multicast packets will be looped back to the local socket.