// Cacher implements storage.Interface (although most of the calls are just
// delegated to the underlying storage).
type Cacher struct {
	// HighWaterMarks for performance debugging.
	// Important: Since HighWaterMark is using sync/atomic, it has to be at the top of the struct due to a bug on 32-bit platforms
	// See: https://golang.org/pkg/sync/atomic/ for more information
	incomingHWM storage.HighWaterMark