Home Manager With Default Values + Extra Special Args

Help
1

Hi all, I’m new to Nix and I have been trying to set up my NixOS + Home Manager.

I currently have successfully set up home manager as a nix os module

    nixosConfigurations = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        ./machines/${hostName}/configuration.nix
        home-manager.nixosModules.home-manager {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.gapuchi = import ./common/home.nix;
          home-manager.extraSpecialArgs =  {
            stateVersion = "23.11";
            includeGuiPkgs = true;
          };
        };
      ];
    };

and have my home.nix

{ pkgs, stateVersion, includeGuiPkgs, ... }: {
...

but I want to make includeGuiPkgs optional and have a default value like

{ pkgs, stateVersion, includeGuiPkgs ? true, ... }: {
...

When I try this with

          home-manager.extraSpecialArgs =  {
            stateVersion = "23.11";
          };

It fails saying

       error: attribute 'includeGuiPkgs' missing

Am I misunderstanding how this works?