anchor.diff:      enable = mkEnableOption "PowerDNS Recursor, a recursive DNS server";
   
       dns.address = mkOption {
  -      type = types.str;
  -      default = "0.0.0.0";
  -      description = ''
  -        IP address Recursor DNS server will bind to.
  +      type = oneOrMore types.str;
  +      default = [ "::" "0.0.0.0" ];
  +      description = ''
  +        IP addresses Recursor DNS server will bind to.
         '';
       };
   
  
positive.code: 
      dns.allowFrom = mkOption {
        type = types.listOf types.str;
        default = [ "10.0.0.0/8" "172.16.0.0/12" "192.168.0.0/16" ];
        example = [ "0.0.0.0/0" ];
        description = ''
          IP address ranges of clients allowed to make DNS queries.
        '';
  
negative.code: 
      api.allowFrom = mkOption {
        type = types.listOf types.str;
        default = [ "127.0.0.1" "::1" ];
        example = [ "0.0.0.0/0" "::/0" ];
        description = ''
          IP address ranges of clients allowed to make API requests.
        '';
  