deleteAll method Null safety
override
Implementation
@override
void deleteAll(Iterable<String> dataIds) => _valueStream.add(
Map.from(_valueStream.value)
..removeWhere((key, _) => dataIds.contains(key)),
);
@override
void deleteAll(Iterable<String> dataIds) => _valueStream.add(
Map.from(_valueStream.value)
..removeWhere((key, _) => dataIds.contains(key)),
);