I'd switch it around: why Cython and not Rust, given their CLI is written in Rust? This strikes me as a perfect use case for Rust, too: it has great compile ti

I'd switch it around: why Cython and not Rust, given their CLI is written in Rust? This strikes me as a perfect use case for Rust, too: it has great compile time memory and other safety guarantees with a speed that is likely close to (or perhaps even better than "safe") C or C++.