anchor.diff:  //  - Element 6: The enum index of the |fontStyle|.
   //
   Int32List _encodeTextStyle(Color color,
  -                           List<TextDecoration> decoration,
  +                           TextDecoration decoration,
                              Color decorationColor,
                              TextDecorationStyle decorationStyle,
                              FontWeight fontWeight,
  
positive.code: }
  
  /// The thickness of the glyphs used to draw the text
  enum FontWeight {
    /// Thin, the least thick
    w100,
  
    /// Extra-light
    w200,
  
    /// Light
    w300,
  
    /// Normal / regular / plain
    w400,
  
    /// Medium
    w500,
  
    /// Semi-bold
    w600,
  
    /// Bold
    w700,
  
    /// Extra-bold
    w800,
  
    /// Black, the most thick
    w900
  }
  
  /// Whether to align text horizontally
  
negative.code: class TextStyle {
    TextStyle({
      Color color,
      TextDecoration decoration,
      Color decorationColor,
      TextDecorationStyle decorationStyle,
      FontWeight fontWeight,
  