priority: medium

Universal Anti-Patterns

Cross-language patterns to NEVER use:

• •Any type (Python, TypeScript, Rust unknown) without exhaustive matching
• •Class-based tests (Python) – use function-based with pytest fixtures
• •Unwrap/panic in production code (Rust) – use Result<T, E>
• •Mocking internal services – use real objects/fixtures
• •Manual dependency management – use lock files (Cargo.lock, pnpm-lock.yaml, etc.)
• •Blocking I/O in async code (Python/TypeScript) – fully async paths
• •Bare exception handlers – catch specific types only
• •Magic numbers – extract to named constants
• •Inheritance for code reuse – prefer composition
• •Global state – dependency injection instead
• •f-strings in logging – structured key=value logging
• •Duplication across bindings – core logic ALWAYS in Rust