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.
More on this storyDredged sediment to be used as coastal buffer。关于这个话题，体育直播提供了深入分析
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Виктория Кондратьева (Редактор отдела «Мир»)
The book was designed by Hitoshi Suzuki (鈴木一誌), one of Japan’s most influential book designers—a protégé of Kohei Sugiura (杉浦 康平) known for radical editorial layouts. Phototypesetting was by Masaaki Inoue (井上聖昭), with design assistance from Takao Kabaya (蒲谷孝夫).，详情可参考体育直播
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