anchor.diff:  
         port = mkOption {
           type = types.int;
  -        default = "5432";
  -        description = ''
  -          Port for PostgreSQL.
  +        default = 5432;
  +        description = ''
  +          The port on which PostgreSQL listens.
           '';
         };
   
  
positive.code:         type = types.bool;
          default = false;
          description = ''
            Whether to run PostgreSQL with -i flag to enable TCP/IP connections.
          '';
        };
  
  
negative.code:       hba_file = '${pkgs.writeText "pg_hba.conf" cfg.authentication}'
        ident_file = '${pkgs.writeText "pg_ident.conf" cfg.identMap}'
        log_destination = 'stderr'
        port = ${toString cfg.port}
        ${cfg.extraConfig}
      '';
  
  