I am not sure what "a list of space-separated addresses"
exactly means. Per=
haps one IPv4 IP address and one IPv6 address if both are available. My use=
case is either a local IPv4 or IPv6 address.
Hmm, a dual-stack machine is the most likely use-case. This also raises the question of
the IP address list os ordered and the caller can therefore give a preference for IPv4 or
IPv6 (e.g. like postfix is doing it for out-going SMTP conns).