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> And as it turns out, reference counting can be blended with immutable region borrowing to greatly reduce its cache misses and make it data-race safe, something no language has done yet.

Rust prevents data races, so I'm not sure what this is referring to.



I think it’s saying that no language has blended reference counting with immutable region borrowing, not that no language is data-race safe.


One kind of data races, in-process memory not shared with other processes.




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