tryAddAll method
Add all items with error handling
Implementation
RxResult<void> tryAddAll(Iterable<T> elements) {
return RxResult.tryExecute(() {
final newSet = Set<T>.from(value);
final sizeBefore = newSet.length;
newSet.addAll(elements);
if (sizeBefore != newSet.length) value = newSet;
}, 'add all items to set');
}