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The receptionist allows something like distributed pub sub by seing the receptionist registration as a subscription to a topic, it does however not do deduplication, when there are multiple "subscribers" on one node a message for that "topic" will go to all of them.
Could it be worth it to introduce an inbetween-topic-actor that does what distributed pub sub does for a single topic (registering to the receptionist when there are any subscribers, forwarding incoming messages to the subscribers).
Descoping typed pubsub compared to untyped, what's left: