{
  config,
  inputs,
  lib,
  pkgs,
  ...
}:
{
  options.my.shell.type = lib.mkOption {
    type = lib.types.enum [
      "bash"
      "zsh"
    ];
    default = "bash";
    description = "The shell to use system-wide (bash or zsh)";
  };
  config = {
    users.users = lib.mkMerge (
      map (user: {
        ${user}.shell = pkgs.${config.my.shell.type};
      }) (inputs.self.lib.normalizeUsers config.my.toggleUsers.shell)
    );
    programs.zsh.enable = config.my.shell.type == "zsh";
  };
}