[2020/11/20 22:33:48.824] FAIL: test_metadata (test_client.ClientUnitTest)
 [2020/11/20 22:33:48.824] ----------------------------------------------------------------------
 [2020/11/20 22:33:48.824] Traceback (most recent call last):
 [2020/11/20 22:33:48.824]   File "/data/mci/52b9e171edeb47e2aab844bb34d76fc9/src/test/test_client.py", line 296, in test_metadata
 [2020/11/20 22:33:48.824]     self.assertRaises(TypeError, DriverInfo, 'Foo', 1, 'a')
 [2020/11/20 22:33:48.824] AssertionError: TypeError not raised by DriverInfo
 [2020/11/20 22:33:48.824] ======================================================================
 [2020/11/20 22:33:48.824] FAIL: test_grid_out_custom_opts (test_custom_types.TestGridFileCustomType)
 [2020/11/20 22:33:48.824] ----------------------------------------------------------------------
 [2020/11/20 22:33:48.824] Traceback (most recent call last):
 [2020/11/20 22:33:48.824]   File "/data/mci/52b9e171edeb47e2aab844bb34d76fc9/src/test/test_custom_types.py", line 736, in test_grid_out_custom_opts
 [2020/11/20 22:33:48.824]     self.assertEqual({"foo": 'red', "bar": 'blue'}, two.metadata)
 [2020/11/20 22:33:48.824] AssertionError: {'foo': 'red', 'bar': 'blue'} != RawBSONDocument(b' \x00\x00\x00\x02foo\x0[333 chars]ne)))
 [2020/11/20 22:33:48.824] ======================================================================
 [2020/11/20 22:33:48.824] FAIL: test_grid_out_cursor_options (test_grid_file.TestGridFile)
 [2020/11/20 22:33:48.824] ----------------------------------------------------------------------
 [2020/11/20 22:33:48.824] Traceback (most recent call last):
 [2020/11/20 22:33:48.824]   File "/data/mci/52b9e171edeb47e2aab844bb34d76fc9/src/test/test_grid_file.py", line 242, in test_grid_out_cursor_options
 [2020/11/20 22:33:48.824]     self.assertEqual(cursor_dict, cursor_clone_dict)
 [2020/11/20 22:33:48.824] AssertionError: {'_Cu[35 chars]sor__exhaust_mgr': None, '_Cursor__max_await_t[1464 chars]': 0} != {'_Cu[35 chars]sor__data': deque([]), '_Cursor__hint': None, [1469 chars]None}
 [2020/11/20 22:33:48.824] Diff is 2289 characters long. Set self.maxDiff to None to see it.
 [2020/11/20 22:33:48.824] ======================================================================
 [2020/11/20 22:33:48.824] FAIL: test_json_options_with_options (test_json_util.TestJsonUtil)
 [2020/11/20 22:33:48.824] ----------------------------------------------------------------------
 [2020/11/20 22:33:48.824] Traceback (most recent call last):
 [2020/11/20 22:33:48.824]   File "/data/mci/52b9e171edeb47e2aab844bb34d76fc9/src/test/test_json_util.py", line 80, in test_json_options_with_options
 [2020/11/20 22:33:48.824]     opts3.uuid_representation, UuidRepresentation.JAVA_LEGACY)
 [2020/11/20 22:33:48.824] AssertionError: 3 != 5

$ git grep _asdict | tee
bson/codec_options.py:313:        opts = self._asdict()
bson/json_util.py:327:        opts = self._asdict()
pymongo/driver_info.py:33:        for name, value in self._asdict().items():

    def _asdict(self):
        return collections.OrderedDict(zip(self._fields, self))