          If the 'field-errors' key exists it is a dict of {field name as string: list of errors as strings}."""
          return self._validate(content)
  
      def _validate(self, content, allowed_extra_fields=()):
          """Wrapped by validate to hide the extra_fields option that the ModelValidatorMixin uses.
          extra_fields is a list of fields which are not defined by the form, but which we still
          expect to see on the input."""
          bound_form = self.get_bound_form(content)
  
          if bound_form is None:
 
</s> remove         expect to see on the input."""
 </s> add         expect to see on the input.
        """ </s> remove         If the 'field-errors' key exists it is a dict of {field name as string: list of errors as strings}."""
 </s> add         If the 'field-errors' key exists it is a dict of {field name as string: list of errors as strings}.
        """ </s> remove         If the 'field-errors' key exists it is a dict of {field name as string: list of errors as strings}."""
 </s> add         If the 'field-errors' key exists it is a dict of {field name as string: list of errors as strings}.
        """ </s> remove The set of authentication methods which are used is then specified by setting
 </s> add The set of authentication methods which are used is then specified by setting the </s> remove         """Given some content as input return some cleaned, validated content.
 </s> add         """
        Given some content as input return some cleaned, validated content.
        """
        Wrapped by validate to hide the extra_fields option that the ModelValidatorMixin uses.
          If the 'field-errors' key exists it is a dict of {field name as string: list of errors as strings}."""
          return self._validate(content)
  
      def _validate(self, content, allowed_extra_fields=()):
        """
        Wrapped by validate to hide the extra_fields option that the ModelValidatorMixin uses.
          extra_fields is a list of fields which are not defined by the form, but which we still
          expect to see on the input."""
          bound_form = self.get_bound_form(content)
  
          if bound_form is None:
keep keep keep keep replace keep keep keep keep keep
 More tests, getting new serialization into resource 
djangorestframework/validators.py