anchor.diff:          '';
         };
         source = mkOption {
  -        type = string;
  +        type = str;
           description = "Source for the in-container mount";
         };
         options = mkOption {
  -        type = loaOf (string);
  +        type = loaOf (str);
           default = [ "bind" ];
           description = ''
             Mount options of the filesystem to be used.
  
positive.code:   mount = with types; (submodule {
      options = {
        type = mkOption {
          type = string;
          default = "none";
          description = ''
            The type of the filesystem to be mounted.
  
negative.code:       type = with types; loaOf (submodule ({ name, config, ... }: {
          options = {
            cmd = mkOption {
              type = types.lines;
              description = "Command or script to run inside the container";
            };
  
  