Introduced `lol.Tracer` for function entry/exit logging across various packages. This improves traceability and debugging of function executions while preserving existing behavior. Removed unused files `doc.go` and `nothing.go` to clean up the repository.
also changes the interface of unmarshal to not return an error, which is something that should really belong elsewhere, both a thing to forget and a thing to have divergences in, not the right way to do it
