Significant Change in json field names on track request 2.4.0 ==> 2.4.1

[brianhwitte]

Simplified use case for python-fedex:

import json
from fedex.services.track_service import FedexTrackRequest
from fedex.tools.conversion import sobject_to_json

def get_delivered_at_time(tracking_number):
    track_request = FedexTrackRequest(fedex_config_object)
    track_request.SelectionDetails.PackageIdentifier.Value = tracking_num
    track_request.SelectionDetails.PackageIdentifier.Type = 'TRACKING_NUMBER_OR_DOORTAG'

    # remove FedEx operating company from request
    del track_request.SelectionDetails.OperatingCompany 

    track_request.send_request()
    json_response = sobject_to_json(track_request.response)
    json_response = json.loads(json_response)

    tracking_details = json_response['CompletedTrackDetails'][0]['TrackDetails']
    if 'ActualDeliveryTimestamp' in tracking_details:
         do stuff

It looks like the ActualDeliveryTimestamp was removed from the specifications for sobject_to_json wsdl specifications used by fedex-python between 2.4.0 and 2.4.1 (see here)

As a result, our code cannot get the essential data from the fedex api response, and the "do stuff" block in our code is unreachable.

I didn't see anything in a changelog about the update. When I contacted Fedex developer support, they claim that no updates were made to the structure of the data they send out.

1. Are we using the package incorrectly?
2. Where would I find out about breaking changes like this?

UPDATED to clarify my question as I understand the changes.

[radzhome]

Use the old version or adapt your code to the new wsdl