anchor.diff:  in
   pkgs.dockerTools.buildLayeredImageWithNixDb {
   
  -  inherit name tag;
  +  inherit name tag maxLayers;
   
     contents = [ baseSystem ];
   
  
positive.code:     iana-etc
      git
      openssh
    ];
  
    users = {
  
  
negative.code: , tag ? "latest"
  , channelName ? "nixpkgs"
  , channelURL ? "https://nixos.org/channels/nixpkgs-unstable"
  , extraPkgs ? []
  , maxLayers ? 100
  }:
  let
    defaultPkgs = with pkgs; [
  