addFill() implementation does not use its data parameter

[tfvtti]

Using mapbox_gl-0.9.0, it appears that MapboxMapController's addFill() method has the 'data' parameter but the implementation of addFill() doesn't use the 'data' parameter.

Snippet from /Users/***/flutter/.pub-cache/hosted/pub.dartlang.org/mapbox_gl-0.9.0/lib/src/controller.dart:

Future<Fill> addFill(FillOptions options, [Map data]) async {
    final FillOptions effectiveOptions =
        FillOptions.defaultOptions.copyWith(options);
    final fill = await MapboxGlPlatform.getInstance(_id).addFill(effectiveOptions);
    _fills[fill.id] = fill;
    notifyListeners();
    return fill;
  }

I've verified that I can specify the 'data' parameter on addCircle() and later retrieve the value from controller.circles but not so for fills.

I started this project by copying the flutter mapbox example but I've cleared the pub-cache and run flutter clean and run pub get so I dont see how I could have an outdated mapbox plugin, but just in case I've attached output from flutter doctor and a copy of pubspec.yaml.

flutter_doctor.txt
pubspec_yaml.txt