anchor.diff:  /// Property with a [value] of type [T].
   ///
   /// If the default `value.toString()` does not provide an adequate description
  -/// of the value, specify [description] defining a custom description.
  +/// of the value, specify `description` defining a custom description.
   ///
   /// The [hidden] property specifies whether the property should be hidden from
   /// the default output (e.g. the output given by [toStringDeep]).
  
positive.code:   ///       showName: false,
    ///     ));
    ///
    ///     description.add(new DiagnosticsProperty<bool>('keepAlive', keepAlive));
    ///
    ///     // FlagProperty could have also been used in this case.
    ///     // This option results in the text "obscureText: true" instead
    ///     // of "obscureText" which is a bit more verbose but a bit clearer.
    ///     description.add(new DiagnosticsProperty<bool>('obscureText', obscureText, defaultValue: false));
    ///
    ///     description.add(new EnumProperty<TextAlign>('textAlign', textAlign, defaultValue: null));
    ///     description.add(new EnumProperty<ImageRepeat>('repeat', repeat, defaultValue: ImageRepeat.noRepeat));
    ///
    ///     // Warn users when the widget is missing but do not show the value.
    ///     description.add(new ObjectFlagProperty<Widget>('widget', widget, ifNull: 'no widget'));
    ///
    ///     description.add(new IterableProperty<BoxShadow>(
    ///       'boxShadow',
    ///       boxShadow,
    ///       defaultValue: null,
  
negative.code:   /// customize how property values are converted to strings.
    ///
    /// Overriding this method ensures that behavior controlling how property
    /// values are decorated to generate a nice [toDescription] are consistent
    /// across all implementations. Debugging tools may also choose to use
    /// [valueToString] directly instead of [toDescription].
    ///
    /// `parentConfiguration` specifies how the parent is rendered as text art.
    /// For example, if the parent places all properties on one line, the value
  