inet or inet6 to limit the results to the given
family.stream or dgram.true (default false), return the canonical host name
in the frist answerIn mode (+,-,+) Address is unified to a dict with the following keys:
inet or inet6. The underlying getaddrinfo() calls
this family. We use domain for consistency with
socket_create/2.stream or dgram.canonname(true) is specified on the first
returned address. Holds the official canonical host name.