// 32bit architectures. See also: https://golang.org/pkg/sync/atomic/#pkg-note-BUG
	baseTimeNanos     int64
	entries           sync.Map
	stats             Stats
	defaultExpiration time.Duration
	stopEvicter       chan bool
	evicterTerminated sync.WaitGroup // used by unit tests to verify the finalizer ran
	callback          EvictionCallback
}

// A single cache entry. This is the values we use in our storage map