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，这一点在Line官方版本下载中也有详细论述
int digits = 0;
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.。PDF资料是该领域的重要参考