It serializes better, it's memory safe, it can be much faster in performance terms, you can get better memory usage if you're holding a lot of "pointers" because the indexes don't need to be 64 bits.
But you lose all ownership tracking / safety that Rust is famous for.
I just can't help but wonder what it means for that paradigm, when the most popular answer to "how do I model my entities in safe Rust" is basically "backdoor the safety".
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