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Ruby 3.5 Feature: Namespace on read

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I understand wanting to merge soon to avoid conflicts but also there hasn't been a proper discussion on the advantages of Namespace vs sub-interpreters (which could have started long before the implementation was near-complete). Given that TruffleRuby and JRuby and many other VMs have sub-interpreters, I think it's crucial to figure out if it's worth doing something different like Namespace (which can't run in parallel, has weaker isolation, has more overhead, etc, so seems worse in most aspects). It is the combination of isolation + constant access outside the namespace + method call semantics that I find difficult to reconcile (does not mean it is impossible with newly introduced rules).

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