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Currently an 8-tuple representing an IPv6 address is not accepted by
gen_tcp:listen/2, gen_tcp:connect/3,4, gen_udp:open/2, or
gen_sctp:open/1,2, unless the 'inet6' option is also given. This means
that an application that has obtained the address, e.g. from
configuration that allows for either IPv4 or IPv6, must always check the
type of the address before passing it to these functions. Letting the
functions infer 'inet6' from the 8-tuple, in case other options do not
override this choice, improves usability.
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