📄️ panic and recover: Rules and Goroutine Boundaries
The exact rules of panic propagation, why recover only works in deferred functions, and why you can't recover a panic from another goroutine.
📄️ Error Handling Patterns: Wrapping, errors.Is, errors.As, Sentinel Errors
The Go 1.13+ error wrapping model, how errors.Is and errors.As walk the error chain, when to use sentinel errors, and idiomatic error handling patterns.