anchor.diff:    final String bodyDefsName;
     final String musicName;
     final bool webgl;
  +  final bool useMaxDelta;
     World world;
     Map<String, List<Polygon>> bodyDefs;
     SpriteSheet spriteSheet;
  
positive.code:       : canvas = null,
          ctx = null,
          gl = null,
          helper = GameHelper(appNahme, null),
          bodyDefsName = null,
          spriteSheetName = null,
  
negative.code:   /// [appName] is used to refernce assets and has to be the name of the library
    /// which contains the assets. Usually the game itself.
    GameBase.noAssets(String appName, String canvasSelector,
        {bool webgl = false,
        bool depthTest = true,
        bool blending = true,
        bool useMaxDelta = true})
        : this(appName, canvasSelector,
              spriteSheetName: null,
              bodyDefsName: null,
              musicName: null,
              webgl: webgl,
              useMaxDelta: useMaxDelta,
              depthTest: depthTest,
              blending: blending);
  
  