I am not familiar with scene graphs, but what is the problem with borrowing or refcounting? This article showed how you can have multiple mutable references in Rust, even multiple mutable references running in parallel threads.
replyRef counting is for ownership, it doesnt convey intent. It kind of accidently works but is the wrong abstraction, especially in code bases where ownership is known.
replyBranch predictor can predict these pretty damn well
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