ben-manes / caffeine / #4650

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Allow caches to have nullable type arguments for their value types. (#1806)

This does not mean that the cache will "contain" `null`, since `null` is
never cached. However, it does allow users to declare whether they want
"a cache whose loads might return `null`" (which thus can return `null`
from cache operations) or "a cache whose loads will never return `null`"
(which thus doesn't require users to handle `null` when they request
that the cache return or load a value).

This PR follows up on https://github.com/ben-manes/caffeine/pull/1805.

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