+#if COLLECT_DEBUG
+ assert(prep_area->ds == NULL);
+ assert(prep_area->instances_pos == NULL);
+ assert(prep_area->values_pos == NULL);
+ assert(prep_area->metadata_pos == NULL);
+ assert(prep_area->instances_buffer == NULL);
+ assert(prep_area->values_buffer == NULL);
+ assert(prep_area->metadata_buffer == NULL);
+#endif
+