// Writing discriminating union is simpler than reading.
public static void WriteValue(this IJSValueWriter writer, OneOf2 <T2Extra, R2D2Extra> value)
{
writer.WriteObjectBegin();
if (value.TryGet(out T2Extra t2))
{
writer.WriteObjectProperty("Kind", RobotModel.T2);
writer.WriteObjectProperties(t2);
}
else if (value.TryGet(out R2D2Extra r2d2))
{
writer.WriteObjectProperty("Kind", RobotModel.R2D2);
writer.WriteObjectProperties(r2d2);
}
writer.WriteObjectEnd();
}