Bind IPv6 listeners and sockets#149
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- Derive UDP family from extra_socket_opts (inet6 atom or {ip, V6}); default IPv4
- Make capability detection family-aware so IPv6-only hosts keep the socket backend
- Honor {ip, Addr} as the bind address on the OTP socket backend
Fixes #146
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Listeners could not start on IPv6: the server socket paths hard-coded the
inetfamily, so an IPv6 bind crashed init withbadargand aninet6entry inextra_socket_optswas ignored.The address family is now inferred from
extra_socket_opts:inet6when aninet6atom or an 8-tuple{ip, V6}is present,inetotherwise (IPv4 default unchanged). This covers the gen_udp listener, the gen_udp client/server send sockets, and the OTPsocketbackend. Capability detection probes the inferred family so an IPv6-only host keeps the socket backend, and the socket backend now binds a specific{ip, Addr}instead of alwaysany.Fixes #146