anchor.diff:  
   /// Alpha values extracted from the native component (for both dark and light mode) to
   /// draw the spinning ticks.
  -const Map<CupertinoActivityIndicatorIOSVersionStyle, List<int>>
  -    _kAlphaValuesMap = <CupertinoActivityIndicatorIOSVersionStyle, List<int>>{
  -  /// The order of these values is designed to match the first frame of the iOS activity indicator which
  -  /// has the most prominent tick at 9 o'clock.
  -  CupertinoActivityIndicatorIOSVersionStyle.iOS13: <int>[
  -    47,
  -    47,
  -    47,
  -    47,
  -    64,
  -    81,
  -    97,
  -    114,
  -    131,
  -    147,
  -    47,
  -    47
  -  ],
  -
  -  /// Alpha values for new style that introduced in iOS14.
  -  CupertinoActivityIndicatorIOSVersionStyle.iOS14: <int>[
  -    47,
  -    47,
  -    47,
  -    47,
  -    72,
  -    97,
  -    122,
  -    147,
  -  ],
  -};
  +const List<int> _kAlphaValues = <int>[
  +  47,
  +  47,
  +  47,
  +  47,
  +  72,
  +  97,
  +  122,
  +  147,
  +];
   
   /// The alpha value that is used to draw the partially revealed ticks.
   const int _partiallyRevealedAlpha = 147;
  
positive.code:               CupertinoDynamicColor.resolve(_kActiveTickColor, context),
            radius: widget.radius,
            progress: widget.progress,
            iOSVersionStyle: widget.iOSVersionStyle,
          ),
        ),
      );
  
negative.code:   ///
    /// Defaults to 1.0. Must be between 0.0 and 1.0 inclusive, and cannot be null.
    final double progress;
  
    @override
    _CupertinoActivityIndicatorState createState() =>
  