The Implementation of Rewind in Braid

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《时空幻境》的倒带需要能回到任意一帧。Jonathan Blow 先把可还原的世界状态定为目标，再利用相邻帧的相似性压缩历史。基准帧保存实体信息，中间帧保存字段差异。

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record the full state of the world, because you know that's robust. You know you can reproduce that.

I have to decode what's in the base frame. And then I have to apply the diffs to the base frame.