Yaml serializer output

[Sergey Fursov]

Hi there,

Before opening a ticket I would like to discuss my problem here.

Django docs say:

```
YAML¶ <https://docs.djangoproject.com/en/4.0/topics/serialization/#yaml> 

YAML serialization looks quite similar to JSON. The object list is 
serialized as a sequence mappings with the keys “pk”, “model” and “fields”. 
Each field is again a mapping with the key being name of the field and the 
value the value:
- fields: {expire_date: !!timestamp '2013-01-16 08:16:59.844560+00:00'} 
model: sessions.session pk: 4b678b301dfd8a4e0dad910de3ae245b 
```
https://docs.djangoproject.com/en/4.0/topics/serialization/#yaml

But I cannot find a way to produce the same output. Both available to me 
environments (MacOS and Debian linux inside a Docker container) product a 
simpler output, like

```
>> obj = core.ModelA.objects.get(id=1)
>> print(serializers.serialize('yaml', [obj]))
- model: core.modela
  pk: 1
  fields:
    created: 2017-02-05 16:11:44.310613+00:00
    .... other fields ...
```

I've found this after running full Django test suite when 6 test from 
django/tests/timezones/tests.py failed. Example failure:

```
FAIL: test_naive_datetime_with_microsecond 
(timezones.tests.SerializationTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/geyser/coding/opensource/django/tests/timezones/tests.py", 
line 671, in test_naive_datetime_with_microsecond
    self.assert_yaml_contains_datetime(data, "2011-09-01 13:20:30.405060")
  File "/Users/geyser/coding/opensource/django/tests/timezones/tests.py", 
line 625, in assert_yaml_contains_datetime
    self.assertRegex(yaml, r"\n  fields: {dt: !(!timestamp)? '%s'}" % 
re.escape(dt))
AssertionError: Regex didn't match: "\\n  fields: {dt: !(!timestamp)? 
'2011\\-09\\-01\\ 13:20:30\\.405060'}" not found in '- model: 
timezones.event\n  pk: null\n  fields:\n    dt: 2011-09-01 
13:20:30.405060\n'
```

I've tried to install several different pyyaml versions (from 6.0 down to 
5.1.2).

Do I miss something or it is a valid issue for opening a ticket?

Thanks,
Sergey Fursov

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