On success that value will be :c:type:`MEMCACHED_SUCCESS`.
If called with the :c:func:`MEMCACHED_BEHAVIOR_USE_UDP` behavior set, the value :c:type:`MEMCACHED_NOT_SUPPORTED` will be returned.
On success that value will be :c:type:`MEMCACHED_SUCCESS`.
If called with the :c:func:`MEMCACHED_BEHAVIOR_USE_UDP` behavior set, the value :c:type:`MEMCACHED_NOT_SUPPORTED` will be returned.