Better Engineer on Instagram: "Python finally has a type checker built for scale. Meta’s new open source tool, Pyrefly, brings instant feedback, strong type inference, and blazing speed to even the largest codebases. Written in Rust, it’s fast enough for 20-million-line projects like Instagram, but simple enough for everyday Python developers. Pyrefly doesn’t just validate your code, it understands it. It guesses types, handles circular imports, and gives IDE-style auto-complete in real time. Wh