anchor.diff:    /// Foldable phone.
     foldableHandheld,
   
  -  /// Slab-style phone.
  -  slabHandheld,
  +  /// Slate-style phone.
  +  slateHandheld,
   
     /// Mobile tablet.
     tabletHandheld,
  
positive.code:   /// Default is null.
    final int viewerCount;
  
    /// If the phone is foldable, is it folded (true) or not (false).
    /// 
    /// If the phone is not foldable, null.
    ///
    /// Default is null.
    final bool isFolded;
  
    /// Angle of eyes of the main user to the screen.
    /// 0 means 'unknown'.
    ///
    /// Default is 0.
  
negative.code:   /// Creates additional data for a [MediaQuery] with explicit values.
    const ExperimentalMediaQueryData({
      this.deviceCorporealContext = DeviceCorporealContext.focused,
      this.deviceCorporealType = DeviceCorporealType.slateHandheld,
      this.isFolded,
      this.viewerCount = 1,
      this.viewingAngle = 0,
  