encode method Null safety

Implementation

Object encode() {
  final Map<Object?, Object?> pigeonMap = <Object?, Object?>{};
  pigeonMap['bounds'] = bounds.encode();
  pigeonMap['maxZoom'] = maxZoom;
  pigeonMap['minZoom'] = minZoom;
  pigeonMap['maxPitch'] = maxPitch;
  pigeonMap['minPitch'] = minPitch;
  return pigeonMap;
}