Making code better with reviews

This post details a specific code improvement within Cloudflare's DNS server related to filtering invalid DNS packet flags. The author initially added a comment to explain a bitmask check (`0x86` and `0x4f`). A code review led to a refactoring that replaced the magic numbers with named constants (`QR`, `AA`, `TC`, `Z`, `RCODE`) and a more explicit bitwise OR operation, significantly improving code readability and maintainability. This demonstrates the impact of code reviews on improving code quality and security.