*/
  @J2ktIncompatible // Thread safety complexity
  ConcurrentMap<K, V> asMap();

  /**
   * Performs any pending maintenance operations needed by the cache. Exactly which activities are
   * performed -- if any -- is implementation-dependent.
   */
  void cleanUp();

Internal properties are **unstable properties**: they CAN be renamed or removed without notice.
They are not intended for general use.
While they can be helpful in isolated cases of troubleshooting, they are intended mostly for testing or other activities within Gradle development.
The behavior behind the internal property can change at any time and without notice.
Internal properties MUST NOT be documented in public documentation.

   * Guava to fix them until Guava is ready to <i>require</i> Java 8 for all users.
   */
  ConcurrentMap<K, V> asMap();

  /**
   * Performs any pending maintenance operations needed by the cache. Exactly which activities are
   * performed -- if any -- is implementation-dependent.
   */
  void cleanUp();