docs: def docs_repr(*args):
      """Stringify ordered dicts like a regular ones.
  
      Preserve order, remove 'u'-prefix on unicodes in Python 2:
  
      >>> print(docs_repr(OrderedDict([(u'_id', 2)])))
      {"_id": 2}
      >>> print(docs_repr(OrderedDict([(u'_id', 2), (u'a', u'b')]),
      ...                 OrderedDict([(u'a', 1)])))
      {"_id": 2, "a": "b"}, {"a": 1}
      >>>
      >>> import datetime
      >>> now = datetime.datetime.utcfromtimestamp(123456)
      >>> print(docs_repr(OrderedDict([(u'ts', now)])))
      {"ts": {"$date": 123456000}}
      >>>
      >>> oid = bson.ObjectId(b'123456781234567812345678')
      >>> print(docs_repr(OrderedDict([(u'oid', oid)])))
      {"oid": {"$oid": "123456781234567812345678"}}
      """
      sio = StringIO()
      for doc_idx, doc in enumerate(args):
          if doc_idx > 0:
              sio.write(u', ')
          sio.write(text_type(json_util.dumps(doc)))
      return sio.getvalue()