I think the assumption is that the hardware spec is correctly implemented and that it runs ideally well. Otherwise that would require some kind of probabilistic

I think the assumption is that the hardware spec is correctly implemented and that it runs ideally well. Otherwise that would require some kind of probabilistic model I guess. But you're right, "purity" is a simplification. Computations are inherently effectful(and even side-effectful depending on the reference frame) in practice. Also, I seem to understand that the research is merely done in the context of the Rust language. The title is maybe a bit too much :)