@Override
    public NavigableSet<E> descendingSet() {
      synchronized (mutex) {
        if (descendingSet == null) {
          NavigableSet<E> dS = Synchronized.navigableSet(delegate().descendingSet(), mutex);
          descendingSet = dS;
          return dS;
        }
        return descendingSet;
      }
    }

    @Override
    public @Nullable E floor(E e) {
      synchronized (mutex) {

    @Override
    public NavigableSet<E> descendingSet() {
      synchronized (mutex) {
        if (descendingSet == null) {
          NavigableSet<E> dS = Synchronized.navigableSet(delegate().descendingSet(), mutex);
          descendingSet = dS;
          return dS;
        }
        return descendingSet;
      }
    }

    @Override
    public @Nullable E floor(E e) {
      synchronized (mutex) {

     * Uses new entraid.use.ds key with fallback to legacy aad.use.ds.
     * @return true if domain services are enabled, false otherwise.
     */
    default boolean isEntraIdUseDomainServices() {
        String value = getSystemProperty("entraid.use.ds", null);
        if (StringUtil.isBlank(value)) {
            value = getSystemProperty("aad.use.ds", "true");
        }

				"application/vnd.symbian.install",
				"application/vnd.syncml+xml",
				"application/vnd.syncml.dm+wbxml",
				"application/vnd.syncml.dm+xml",
				"application/vnd.syncml.dm.notification",
				"application/vnd.syncml.ds.notification",
				"application/vnd.tao.intent-module-archive",
				"application/vnd.tcpdump.pcap",
				"application/vnd.tmobile-livetv",
				"application/vnd.trid.tpt",
				"application/vnd.triscape.mxs",