docs: public boolean clearDataBytes(String fullPath, int ifVersion)
      {
          ChildData data = currentData.get(fullPath);
          if ( data != null )
          {
              if ( (ifVersion < 0) || (ifVersion == data.getStat().getVersion()) )
              {
                  if ( data.getData() != null )
                  {
                      currentData.replace(fullPath, data, new ChildData(data.getPath(), data.getStat(), null));
                  }
                  return true;
              }
          }
          return false;
      }