docs: def default(self, o):
          """ Encode JSON.
  
          :return str: A JSON encoded string
  
          """
          if isinstance(o, (datetime.datetime, datetime.date, datetime.time)):
              return o.isoformat()
  
          if isinstance(o, decimal.Decimal):
              return float(o)
  
          return json.JSONEncoder.default(self, o)