I suspect it's almost entirely due to string data, and almost everything else gets mutated.
The main reason it's of interest is that forwarding a frozen object is very easy; you don't care which version the client code operates on, because neither is changing, so you don't need a barrier. What I'm really wondering here is whether a "frozen" bit in the object header would have much payoff. I suspect that with additional source language emphasis on immutability it might. shap
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