[dmkolobov]

Yeah, it has its limits for sure. I like it for the streaming aspect.

I think you can still have the functionality described in the article: you would send “hole” markers tagged with their level. Then, you could make additional requests when you encounter these markers during the recovery phase, possibly with buffering of holes. It becomes a sort of hybrid DFS/BFS approach where you send as much tree structure at a time as you want.