Our goal is to make it easier to write code that handles failures - failed outbound api calls, infrastructure issues like a host dying, problems talking between services. The primitive we offer is that we guarantee that your handlers always run to completion (whether to a result or a terminal error)
The way we do that is by writing down what your code is doing, while its doing it, to a store. Then, on any failure, we re-execute your code, fill in any previously stored results, so that it can 'zoom' back to the point where it failed, and continue. It's like a much more efficient and intelligent retry, where the code doesn't have to be idempotent.