I have a model with the following field:

max_age = models.DurationField(null=True, default=None, validators=[MinValueValidator(timedelta(0))])

The schema contains the following output:

        max_age:
          type: string
          nullable: true
          minimum: !!python/object/apply:datetime.timedelta
          - 0
          - 0
          - 0

This cannot be rendered by Swagger / ReDoc, leading to failures when loading the schema.