Wrap Multiple Errors

HashiCorp, they had a library that did that. I think it was called multi error. But no one wants to roll out their own function function signatures with list of errors because everybody likes if they're different for nil and it just works. So now you can unwrap multiple errors. What I'm concerned about is the ability of people to use this structure in a way that doesn't make their code horrible. Now it's wrap air, wrap a wrapper and return might be good might be not.