Support error causes and aggregate errors

Looking at the implementation, only stack traces are reported. It'd be great if [`cause` properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error#differentiate_between_similar_errors) and [`AggregateError`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/AggregateError) could be supported. This is now idiomatic JavaScript.