Because of immutable data, it is really an implementation detail. So it would be possible to switch implementation and with extra complexity have it where messa

Because of immutable data, it is really an implementation detail. So it would be possible to switch implementation and with extra complexity have it where messages are not copied. I even seem to recall there was a historical implementation of the Erlang VM which didn't copy the messages, or maybe it was a port to an alternate VM like JVM...