jsonpickle.dumps() not serializing pandas' index freq, or jsonpickle.loads() no deserializing it.

[thompsonp17]

Hi, folks. I've just got a problem when trying to serialize a pandas DataFrame.

Python version: 3.7.5
jsonpickle version: 1.4.1

My df, here called dataset, has this index:

>>> dataset.index
DatetimeIndex(['2020-01-01 00:00:00+00:00', '2020-01-01 01:00:00+00:00',
               '2020-01-01 02:00:00+00:00', '2020-01-01 03:00:00+00:00',
               '2020-01-01 04:00:00+00:00', '2020-01-01 05:00:00+00:00',
               '2020-01-01 06:00:00+00:00', '2020-01-01 07:00:00+00:00',
               '2020-01-01 08:00:00+00:00', '2020-01-01 09:00:00+00:00',
               ...
               '2020-01-30 15:00:00+00:00', '2020-01-30 16:00:00+00:00',
               '2020-01-30 17:00:00+00:00', '2020-01-30 18:00:00+00:00',
               '2020-01-30 19:00:00+00:00', '2020-01-30 20:00:00+00:00',
               '2020-01-30 21:00:00+00:00', '2020-01-30 22:00:00+00:00',
               '2020-01-30 23:00:00+00:00', '2020-01-31 00:00:00+00:00'],
              dtype='datetime64[ns, UTC]', length=721, freq='<DateOffset: seconds=3600>')

Now, look to this result, paying particular attention to freq:

jsonpickle.loads(jsonpickle.dumps(dataset)).index
DatetimeIndex(['2020-01-01 00:00:00+00:00', '2020-01-01 01:00:00+00:00',
               '2020-01-01 02:00:00+00:00', '2020-01-01 03:00:00+00:00',
               '2020-01-01 04:00:00+00:00', '2020-01-01 05:00:00+00:00',
               '2020-01-01 06:00:00+00:00', '2020-01-01 07:00:00+00:00',
               '2020-01-01 08:00:00+00:00', '2020-01-01 09:00:00+00:00',
               ...
               '2020-01-30 15:00:00+00:00', '2020-01-30 16:00:00+00:00',
               '2020-01-30 17:00:00+00:00', '2020-01-30 18:00:00+00:00',
               '2020-01-30 19:00:00+00:00', '2020-01-30 20:00:00+00:00',
               '2020-01-30 21:00:00+00:00', '2020-01-30 22:00:00+00:00',
               '2020-01-30 23:00:00+00:00', '2020-01-31 00:00:00+00:00'],
              dtype='datetime64[ns, UTC]', length=721, freq=None)

So, it seems like the package is not serializing or deserializing the whole object.

Thank you in advance.