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A Redis miss can arrive just before a coalesced request fills the cache, then enter singleflight after the original leader has finished. Rechecking the typed cache entry inside the new leader avoids a duplicate database query.
The regression reproduces that late-miss ordering deterministically. The cache suite passed 20 repetitions, and the same change is included in the qualified Canadaverse preview backend. No API or schema change.
Closes #258.