anchor.diff:    }
   
     @override
  -  applyInterpolation(
  +  void applyInterpolation(
         ActorComponent component, double time, KeyFrame toFrame, double mix) {
       ColorStroke cs = component as ColorStroke;
       Float32List wr = cs.color;
  
positive.code:     int len = _value.length;
  
      double f = (time - _time) / (toFrame.time - _time);
      double fi = 1.0 - f;
      if (mix == 1.0) {
        for (int i = 0; i < len; i++) {
  
negative.code:     return frame;
    }
  
    @override
    void setNext(KeyFrame frame) {
      // Do nothing.
    }
  
    @override
    void applyInterpolation(
        ActorComponent component, double time, KeyFrame toFrame, double mix) {
      ActorColor ac = component as ActorColor;
  