docs: boolean isAvailableDeviceId(OmemoDevice userDevice, int id) {
          LOGGER.log(Level.INFO, "Check if id " + id + " is available...");
  
          // Lookup local cached device list
          BareJid ownJid = userDevice.getJid();
          OmemoCachedDeviceList cachedDeviceList;
  
          cachedDeviceList = loadCachedDeviceList(userDevice, ownJid);
  
          if (cachedDeviceList == null) {
              cachedDeviceList = new OmemoCachedDeviceList();
          }
          // Does the list already contain that id?
          return !cachedDeviceList.contains(id);
      }