You cannot share arbitrarily structured objects in the `ShareableList`, only atomic scalars and bytes / strings.
If you want to share structured Python objects between instances, you have to pay the cost of `pickle.dump/pickle.dump` (CPU overhead for interprocess communication) + the memory cost of replicated objects in the processes.
If you want to share structured Python objects between instances, you have to pay the cost of `pickle.dump/pickle.dump` (CPU overhead for interprocess communication) + the memory cost of replicated objects in the processes.