In bringing up --platform=chrome Dart unit test CI in flutter/packages, rfw fails a bunch of tests. Mostly it looks like use of Int64, which isn't supported, but there's at least on number formatting issue due to the int vs double problem as well.

For now I'm opting the entire package out of web testing via a dart_test.yaml file that requires vm, but since the package appears to support web, presumably this should be fixed.

FYI @Hixie