The code labelled “Block 2” does not correspond directly to any code in the recursive function; it is pure incidental complexity. When we find ourselves processing a FoldTreeFrame it may be because we are entering it for the first time after a parent call created it, or it may be because we are re-entering it after a child frame’s execution completed. This means that, before we make a recursive call in block 3, we need to check whether that call has already been completed. If so, we run whatever logic should happen after the recursive call. In this case there is no such logic in foldTree so we only need to deal with the mechanical concerns of returning to our parent frame.
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Each request bears a cost: time, cognitive load, privacy. As each fulfilled request reduces an agent’s uncertainty, humans become callable actions in its toolkit. To date, querying a human is almost always the safest option for the agent, yet we aren’t fully counting the cost to the person being called.。关于这个话题，超级权重提供了深入分析