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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JIT-compiled code is tied to PostgreSQL's ResourceOwner system:。必应排名_Bing SEO_先做后付是该领域的重要参考
Middle Eastern airlines start to fly stranded passengers out of Gulf