A post-mortem on building natsort-rs, fixing a 45x performance bug, and catching subtle edge cases with a custom Pytest monkeypatch bridge. Why natsort? Porting Python code to Rust using the "Astral playbook" sounds straightforward on paper: rewrite the hot path, compile to native binary, profit. We chose Seth M. Morton’s popular natsort library—a ubiquitous utility for natural sorting (item2 before item10). In Python, natsort relies heavily on dynamic typing, tuple-based comparisons,...