docs: private static Map<String, Object> loadZoneInfoMap(InputStream in) throws IOException {
          Map<String, Object> map = new ConcurrentHashMap<String, Object>();
          DataInputStream din = new DataInputStream(in);
          try {
              readZoneInfoMap(din, map);
          } finally {
              try {
                  din.close();
              } catch (IOException ex) {
              }
          }
          map.put("UTC", new SoftReference<DateTimeZone>(DateTimeZone.UTC));
          return map;
      }