It seems wrong that libtaxii forces number fields ([`result_part_number`](https://github.com/TAXIIProject/libtaxii/blob/master/libtaxii/messages_11.py#L2728), [`record_count`](https://github.com/TAXIIProject/libtaxii/blob/master/libtaxii/messages_11.py#L482), [`collection_volume`](https://github.com/TAXIIProject/libtaxii/blob/master/libtaxii/messages_11.py#L1743)) to be only of type `int`. It should allow `long` values as well.