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The javadoc for com.github.benmanes.caffeine.cache.Expiry states:
To indicate no expiration an entry may be given an excessively long period, such as
Long#MAX_VALUE.
This isn't strictly accurate as if you use Long.MAX_VALUE the expiry (now + duration) overflows and you end up with a negative eviction time, ie the entry gets evicted almost immediately.
It looks like this scenario is guarded against in the Async code by restricting the effective duration to (Long.MAX_VALUE >> 1) but this isn't done in com.github.benmanes.caffeine.cache.BoundedLocalCache.
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