Serialization of Pandas' Timestamp

[odelmarcelle]

I was wondering why the serialization of Pandas' Timestamp object was not possible even though they inherit from datetime.datetime.

>>> import orjson
>>> orjson.__version__
'3.9.10'
>>> import pandas as pd
>>> import datetime
dt = datetime.datetime(2023, 11, 23)
>>> orjson.dumps(dt)
b'"2023-11-23T00:00:00"'
>>> ts = pd.Timestamp(dt)
>>> isinstance(ts, datetime.datetime)
True
>>> orjson.dumps(ts)
TypeError: Type is not JSON serializable: Timestamp

Wouldn't it better to check first if the object to serialize is a subclass of serializable types?

It already seems to be the case for classes inheriting from dict, but not from datetime.datetime.

>>> class CustomDT(datetime.datetime):
>>>     pass
>>> cdt = CustomDT(2023, 11, 23)
>>> orjson.dumps(cdt)
TypeError: Type is not JSON serializable: CustomDT
>>> class CustomDict(dict):
>>>     pass
>>> cdict = CustomDict([('key', 'value')])
>>> orjson.dumps(cdict)
b'{"key":"value"}'