StopOrder(vt_symbol='pp2309.DCE', direction=<Direction.LONG: '多'>, offset=<Offset.CLOSE: '平'>, price=7429.0, volume=1.0, stop_orderid='STOP.1', strategy_name='5', datetime=datetime.datetime(2023, 8, 7, 11, 8, 2, 204781, tzinfo=zoneinfo.ZoneInfo(key='Asia/Shanghai')), lock=False, net=False, vt_orderids=[], status=<StopOrderStatus.WAITING: '等待中'>)
停止单格式如上所示，保存到json时报错如下所示，咨询一下有什么好的方法把停止单保存到字典，开盘后再发出来吗？
Traceback (most recent call last):
File "C:\veighna_studio\lib\site-packages\vnpy_ctastrategy\engine.py", line 887, in stop_all_strategies
self.stop_strategy(strategy_name)
File "C:\veighna_studio\lib\site-packages\vnpy_ctastrategy\engine.py", line 738, in stop_strategy
self.sync_strategy_data(strategy)
File "C:\veighna_studio\lib\site-packages\vnpy_ctastrategy\engine.py", line 842, in sync_strategy_data
save_json(self.data_filename, self.strategy_data)
File "C:\Users\784050800_1623449582\Desktop\vnpy-3.7.0\vnpy\trader\utility.py", line 118, in save_json
json.dump(
File "C:\veighna_studio\lib\json\__init__.py", line 179, in dump
for chunk in iterable:
File "C:\veighna_studio\lib\json\encoder.py", line 431, in _iterencode
yield from _iterencode_dict(o, _current_indent_level)
File "C:\veighna_studio\lib\json\encoder.py", line 405, in _iterencode_dict
yield from chunks
File "C:\veighna_studio\lib\json\encoder.py", line 405, in _iterencode_dict
yield from chunks
File "C:\veighna_studio\lib\json\encoder.py", line 325, in _iterencode_list
yield from chunks
File "C:\veighna_studio\lib\json\encoder.py", line 438, in _iterencode
o = _default(o)
File "C:\veighna_studio\lib\json\encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type StopOrder is not JSON serializable
