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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The JPMorgan Chase CEO was once a 28-year-old Harvard MBA graduate working under the American Express president at the time, Sanford “Sandy” Weill. Dimon was selective about when he spoke, preferring to stay silent if he couldn’t add anything substantial to the conversation.
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commit to retaining a particular compatibility behavior forever, as