Support serializer field with name "fields"

[kalekseev]

Consider the case:

 class FieldsSerializer(serializers.Serializer):
     ...
 
 
 class OtherSerializer(serializers.Serializer):
    fields = FieldsSerializer()

Mypy will complain with: error: Incompatible types in assignment (expression has type "FieldsSerializer", base class "Serializer" defined the type as "Dict[str, Field]")

[MarcinWieczorek]

You're trying to shadow Serializer's property fields, I think you really shouldn't do that, internals might be relying on that

[MarcinWieczorek]

imho it's a wontfix and should be closed.

[sobolevn]

I agree. fields is defined in Serializer. The best practice is not to override names like that.