* CloseableList}, but it has not yet run. The {@link CloseableList} may not be subsumed.
     */
    WILL_CLOSE,

    /**
     * The callback that closes the {@link CloseableList} is running, but it has not completed. The
     * {@link CloseableList} may not be subsumed.
     */
    CLOSING,

    /** The {@link CloseableList} has been closed. It may not be further subsumed. */