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Rather than fully removing the key from the map, we set the register value to null. The metadata is kept around so we can disambiguate deletions from states that simply don’t have a key yet. These are called tombstones — the ghosts of CRDTs past.
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稳定并完善常态化帮扶政策体系。坚持“大稳定、小调整”，过渡期后现有帮扶政策总体保持稳定。充分发挥中央财政常态化帮扶资金作用，重点用于产业帮扶、就业帮扶和欠发达地区开发式帮扶。深化东西部协作、中央单位定点帮扶、驻村帮扶、社会帮扶和考核评估等行之有效的做法，适当优化调整政策实施方式，切实提高常态化帮扶实效。，这一点在夫子中也有详细论述
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