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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Takedowns to defunct social media platform cohost corroborated in personal communications with jae kaplan and Misty De Méo, January 28, 2026. ↩︎