@CheckForNull transient Cache<K, V> delegate;

    ManualSerializationProxy(LocalCache<K, V> cache) {
      this(
          cache.keyStrength,
          cache.valueStrength,
          cache.keyEquivalence,
          cache.valueEquivalence,
          cache.expireAfterWriteNanos,
          cache.expireAfterAccessNanos,
          cache.maxWeight,
          cache.weigher,

      NavigableMap<K, V> synchronizedNavigableMap(NavigableMap<K, V> navigableMap) {
    return Synchronized.navigableMap(navigableMap);
  }

  /**
   * {@code AbstractMap} extension that makes it easy to cache customized keySet, values, and
   * entrySet views.
   */
  @GwtCompatible
  abstract static class ViewCachingAbstractMap<
          K extends @Nullable Object, V extends @Nullable Object>