anchor.diff:        '';
       };
   
  -    refreshRate = mkOption {
  -      type = types.ints.unsigned;
  -      default = 0;
  -      example = 60;
  -      description = ''
  -       Screen refresh rate (0 = automatically detect).
  -      '';
  -    };
  -
       settings = with types;
       let
         scalar = oneOf [ bool int float str ]
  
positive.code:       # other options
        backend          = cfg.backend;
        vsync            = cfg.vSync;
        refresh-rate     = cfg.refreshRate;
      };
  
      systemd.user.services.picom = {
  
negative.code: 
    imports = [
      (mkAliasOptionModule [ "services" "compton" ] [ "services" "picom" ])
      (mkRemovedOptionModule [ "services" "picom" "refreshRate" ] ''
        This option corresponds to `refresh-rate`, which has been unused
        since picom v6 and was subsequently removed by upstream.
        See https://github.com/yshui/picom/commit/bcbc410
      '')
    ];
  
    options.services.picom = {
  