unstable_cache is Next's persistent Data Cache; cache from React is per-request memoization — they stack.
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unstable_cache vs `cache` (React) — which dedupes what?
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cachingunstable_cache
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cache() (React) memoizes per request; unstable_cache (Next) persists across requests with tags/revalidate — use cache to dedupe, unstable_cache to persist, or 'use cache' to replace the latter.
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Dossier 91 of 95 decoded in the Next.js track. One more won't hurt.