anchor.diff:  
   -spec get_net_family() -> inet:address_family().
   get_net_family() ->
  -    case misc:is_ipv6() of
  +    case is_ipv6() of
           true ->
               inet6;
           false ->
  
positive.code: 
  -spec get_proto_dist_type() -> string().
  get_proto_dist_type() ->
      case misc:is_ipv6() of
          true ->
              "inet6_tcp";
          false ->
  
negative.code: 
  -spec inaddr_any([] | [url]) -> string().
  inaddr_any(Options) ->
      case is_ipv6() of
          true ->
              case Options of
                  [] ->
  