Are you sure about this? Not sure what you mean by "offset" but we are passing the last document of the current batch to the .startAfter() method which ensures that the next batch only contains the docs that come after that. So there shouldn't be any doc that is processed twice. But as I said earlier, the new docs won't be traversed which is expected. I'm working on a different type of traverser that will fix this.

I'll actually write up some tests to confirm that we don't process any docs twice!