anchor.diff:    ///
     /// This is provided for all event kinds except for:
     ///  - VMUpdate
  -  @optional IsolateRef isolate;
  +  @optional
  +  IsolateRef isolate;
   
     /// The vm with which this event is associated.
     ///
     /// This is provided for the event kind:
     ///  - VMUpdate
  -  @optional VMRef vm;
  +  @optional
  +  VMRef vm;
   
     /// The timestamp (in milliseconds since the epoch) associated with this
     /// event. For some isolate pause events, the timestamp is from when the
  
positive.code:   ///  - Double (suitable for passing to Double.parse())
    ///  - Int (suitable for passing to int.parse())
    ///  - String (value may be truncated)
    @optional String valueAsString;
  
    /// The valueAsString for String references may be truncated. If so, this
    /// property is added with the value 'true'.
    ///
    /// New code should use 'length' and 'count' instead.
    @optional bool valueAsStringIsTruncated;
  
    /// The length of a List or the number of associations in a Map or the number
    /// of codeunits in a String.
  
negative.code:   ///
    /// This is provided for the event kinds:
    ///  - PauseBreakpoint
    @optional
    List<Breakpoint> pauseBreakpoints;
  
    /// The top stack frame associated with this event, if applicable.
    ///
  