I want to fetch the info about 10 posts immediately before and after a given post ID. I could do it across 21 individual requests, but that seems wasteful, since if I knew the page, I'd need two requests at most. Is there some way to elegantly do this? The only things that come to mind are manual calculation based on the latest post ID (unreliable) and some kind of binary search across pages (which will probably be slower than the simple way).