Enum value that allows to configure which item to nullify inside the provided axlStream reference.

Enumerator:
LAST_CHUNK  Nullify the last chunk returned due to call from axl_stream_get_until.
LAST_NEAR_TO  Nullify the last chunk returned by axl_stream_get_near_to function.
LAST_GET_FOLLOWING  Nullify the last chunk returned by axl_stream_get_following function.