code: def _MergeIdentical(self, a, b):
      
      if a != b:
        raise MergeError("values must be identical ('%s' vs '%s')" %
                         (transitfeed.EncodeUnicode(a),
                          transitfeed.EncodeUnicode(b)))
      return b
docs: Tries to merge two values. The values are required to be identical.
  
      Args:
        a: The first value.
        b: The second value.
  
      Returns:
        The trivially merged value.
  
      Raises:
        MergeError: The values were not identical.