old_contents: """
  Serialize data to/from JSON
  """
  from django.utils import simplejson
  from python import Serializer as PythonSerializer
  from django.core.serializers.json import Deserializer as JSONDeserializer, \
      DjangoJSONEncoder
  
  class Serializer(PythonSerializer):
      """
      Convert a queryset to JSON.
      """
      def end_serialization(self):
          """Output a JSON encoded queryset."""
          self.options.pop('stream', None)
          self.options.pop('fields', None)
          self.options.pop('excludes', None)
          self.options.pop('relations', None)
          self.options.pop('extras', None)
          simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder,
              **self.options)
  
      def getvalue(self):
          """
          Return the fully serialized queryset (or None if the output stream
          is not seekable).
          """
  
          if callable(getattr(self.stream, 'getvalue', None)):
              return self.stream.getvalue()
  
  Deserializer = JSONDeserializer
  
new_contents: """
  Serialize data to/from JSON
  """
  from django.utils import simplejson
  from python import Serializer as PythonSerializer
  from django.core.serializers.json import Deserializer as JSONDeserializer, \
      DjangoJSONEncoder
  
  class Serializer(PythonSerializer):
      """
      Convert a queryset to JSON.
      """
      def end_serialization(self):
          """Output a JSON encoded queryset."""
          self.options.pop('stream', None)
          self.options.pop('fields', None)
          self.options.pop('excludes', None)
          self.options.pop('relations', None)
          self.options.pop('extras', None)
          self.options.pop('use_natural_keys', None)
          simplejson.dump(self.objects, self.stream, cls=DjangoJSONEncoder,
              **self.options)
  
      def getvalue(self):
          """
          Return the fully serialized queryset (or None if the output stream
          is not seekable).
          """
  
          if callable(getattr(self.stream, 'getvalue', None)):
              return self.stream.getvalue()
  
  Deserializer = JSONDeserializer
  
subject: make sure we pop use_natural_jeys option.