anchor.diff:  
       forwardZonesRecurse = mkOption {
         type = types.attrs;
  -      example = { eth = "127.0.0.1:5353"; };
  +      example = { eth = "[::1]:5353"; };
         default = {};
         description = ''
           DNS zones to be forwarded to other recursive servers.
  
positive.code: 
      api.allowFrom = mkOption {
        type = types.listOf types.str;
        default = [ "0.0.0.0/0" ];
        description = ''
          IP address ranges of clients allowed to make API requests.
        '';
  
negative.code: 
      dns.allowFrom = mkOption {
        type = types.listOf types.str;
        default = [
          "127.0.0.0/8" "10.0.0.0/8" "100.64.0.0/10"
          "169.254.0.0/16" "192.168.0.0/16" "172.16.0.0/12"
          "::1/128" "fc00::/7" "fe80::/10"
        ];
        example = [ "0.0.0.0/0" "::/0" ];
        description = ''
          IP address ranges of clients allowed to make DNS queries.
        '';
  