ben-manes / caffeine / #5357

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Fix SerializationProxy dropping zero-duration expiration on round-trip

The expiration nanos fields defaulted to 0 and used > 0 checks, making
"not configured" (default 0) indistinguishable from "configured as 0"
(valid evict-immediately semantics). After serialization round-trip, a
cache with zero-duration expiration silently became a cache with no
expiration.

Changed to use UNSET_INT (-1) sentinel, consistent with how maximumSize
and maximumWeight are already handled in the same class.

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