code: def _MergeIdenticalCaseInsensitive(self, a, b):
      
      if a.lower() != b.lower():
        raise MergeError("values must be the same (case insensitive) "
                         "('%s' vs '%s')" % (transitfeed.EncodeUnicode(a),
                                             transitfeed.EncodeUnicode(b)))
      return b
docs: Tries to merge two strings.
  
      The string are required to be the same ignoring case. The second string is
      always used as the merged value.
  
      Args:
        a: The first string.
        b: The second string.
  
      Returns:
        The merged string. This is equal to the second string.
  
      Raises:
        MergeError: The strings were not the same ignoring case.