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。17c 一起草官网对此有专业解读
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.
Конфликт США с Ираном назвали ударом для Украины14:58