Use memoryview in serialized cache

unidist/core/backends/mpi/core/local_object_store.py

@@ -280,7 +280,7 @@ def cache_serialized_data(self, data_id, data):
         # We make a copy to avoid data corruption obtained through out-of-band serialization,
         # and buffers are marked read-only to prevent them from being modified.
         # `to_bytes()` call handles both points.
-        data["raw_buffers"] = [buf.tobytes() for buf in data["raw_buffers"]]
+        data["raw_buffers"] = [memoryview(buf.tobytes()) for buf in data["raw_buffers"]]
         self._serialization_cache[data_id] = data
         self.maybe_update_data_id_map(data_id)