anchor.diff:  
   -spec split_host_port(list(), list()) -> tuple().
   split_host_port(HostPort, DefaultPort) ->
  -    split_host_port(HostPort, DefaultPort, misc:is_ipv6()).
  +    split_host_port(HostPort, DefaultPort, is_ipv6()).
   
   -spec split_host_port(list(), list(), boolean()) -> tuple().
   split_host_port("[" ++ Rest, DefaultPort, true) ->
  
positive.code: 
  -spec inaddr_any([] | [url]) -> string().
  inaddr_any(Options) ->
      case misc:is_ipv6() of
          true ->
              case Options of
                  [] ->
  
negative.code: 
  -spec get_net_family() -> inet:address_family().
  get_net_family() ->
      case is_ipv6() of
          true ->
              inet6;
          false ->
  