Caching more would be risky, but this caches less.
The TTL in seconds for negative lookups. If a store path is queried from a substituter but was not found, there will be a negative lookup cached in the local disk cache database for the specified duration.
It does not mention an additional long-lived cache in nix-daemon that can't be cleared.
If the implementation doesn't conform to the docs, isn't that a bug?
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