### p(n) is hmac-sha256(key=secret, data=a(n)+seed)
Streaming server-side rendering (SSR) is a particularly painful case. A typical SSR stream might render thousands of small HTML fragments, each passing through the streams machinery:
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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.