Django IntegerField Enumeration does not correctly convert the __empty__ value in a ChoiceField

[gabn88]

Checklist

• Raised initially as discussion #...
• This cannot be dealt with as a third party library. (We prefer new functionality to be in the form of third party libraries where possible.)
• I have reduced the issue to the simplest possible case.

Giving the following model and a default Serializer configuration, this raise a TypeError if you select 'unknown' in the Browsable API.

The error: '<' not supported between instances of 'NoneType' and 'int' seems to be coming from the MinValueValidator.

class MyChoices(models.IntegerChoices):
    ONE = 1, 'One'
    TWO = 2, 'Two'
    __empty__ =  'unknown'

class MyModel(models.Model):
    something = models.IntegerField(choices=MyChoices.choices, null=True, blank=True)

The problems seems to be coming from fields.py:

    def run_validation(self, data=empty):
        """
        Validate a simple representation and return the internal value.

        The provided data may be `empty` if no representation was included
        in the input.

        May raise `SkipField` if the field should not be included in the
        validated data.
        """
        (is_empty_value, data) = self.validate_empty_values(data) -> data is 'None' here, so the is_empty_value converts to False
        if is_empty_value:
            return data
        value = self.to_internal_value(data)
        self.run_validators(value)
        return value

[Ehsan200]

Hello there!
I've just tested this in browsable API and there is no problem occurred for me with these codes:

# serializers.py
class MyModelSerializer(ModelSerializer):
    class Meta:
        model = MyModel
        fields = '__all__'

# views.py
class MyModelViewSet(ModelViewSet):
    serializer_class = MyModelSerializer
    queryset = MyModel.objects.all()

# urls.py
router = routers.SimpleRouter()

router.register(r'my-model', MyModelViewSet)

urlpatterns = [
    *router.urls,
]

could you please provide us with the version of Django and DRF used?
my versions:
-Django 4.1.6
-djangorestframework 3.14.0