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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.，详情可参考im钱包官方下载
“We need safe companies. It’s like cigarettes. It may turn out that there were some things that made people more vulnerable to lung cancer, but cigarettes were the problem,” Halpern told Fortune.