code: def _update_dict(self, newdict):
          
          if self.bugzilla:
              self.bugzilla.post_translation({}, newdict)
  
              # pylint: disable=protected-access
              aliases = self.bugzilla._get_bug_aliases()
              # pylint: enable=protected-access
  
              for newname, oldname in aliases:
                  if oldname not in newdict:
                      continue
  
                  if newname not in newdict:
                      newdict[newname] = newdict[oldname]
                  elif newdict[newname] != newdict[oldname]:
                      log.debug("Update dict contained differing alias values "
                                "d[%s]=%s and d[%s]=%s , dropping the value "
                                "d[%s]", newname, newdict[newname], oldname,
                              newdict[oldname], oldname)
                  del(newdict[oldname])
  
          for key in newdict.keys():
              if key not in self._bug_fields:
                  self._bug_fields.append(key)
          self.__dict__.update(newdict)
  
          if 'id' not in self.__dict__ and 'bug_id' not in self.__dict__:
              raise TypeError("Bug object needs a bug_id")
docs: Update internal dictionary, in a way that ensures no duplicate
          entries are stored WRT field aliases