unzip method
Unzips a FutureOption containing a tuple into a tuple of FutureOptions.
Implementation
Future<(Option<T>, Option<U>)> unzip() async {
var optionTuple = await this;
if (optionTuple.isSome()) {
var (one, two) = optionTuple.unwrap();
return (Some(one), Some(two));
}
return (_None(), _None());
}