Yes, v3 is implemented in the Rust backend. I’m afraid I’m not really keen on a PR that adds this as an optional feature, as it means another option users would need to think about, and it means the code will be even harder to maintain, as we now need to deal with two different approaches. That said, I will keep an eye on demand for this as v3 receives more uptake, and can revisit the decision in the future if necessary. Sorry to not have better news there, but happy to hear that you like other aspects of 2.1.45 - thanks for taking the time to say so 
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