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It is interesting to look at virtual machines from the prospective of what they enforce. The JVM was a huge step forward when it allowed for safer memory management. Garbage collection is possible precisely because JVM enforces its memory model. You cannot use pointer arithmetic and arbitrary casts. This helps to ensure the level of ecosystem and make developers more productive. Erlang VM enforces immutability at its core. We can call it safer concurrency management. We can combine hundreds of libraries and still maintain this safety. I would argue that if something is not enforced in the VM, but rather a is "good guideline", the ecosystem descends to the lowest safety that is enforced.



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