anchor.diff:          idempotent and fast.
         '';
   
  -      type = types.attrsOf types.unspecified;
  +      type = with types; attrsOf scriptType;
   
         apply = set: {
           script = ''
  
positive.code:       utillinux # needed for mount and mountpoint
      ];
  
  in
  
  {
  
negative.code:         idempotent and fast.
        '';
  
        type = types.attrsOf scriptType;
  
        apply = set: {
          script =
  