"openstack volume create" sending null values in create requests

Hello, I tried to analyze the code to resolve this issue.
After adding debugging logs and checking actual API requests, I found the following:

If you add code to filter null values in the python-openstackclient:
volume_args = {k: v for k, v in volume_args.items() if v is not None}
The actual API request still included a null value.

Debug Log Results:
Volume args before filtering: {'size': 1, 'snapshot_id': None, ...}
Volume args after filtering: {'size': 1, 'name': 'test_volume'}
Final volume args being passed to create(): {'size': 1, 'name': 'test_volume'}

However, actual API requests:
REQ: -d '{"volume": {"size": 1, "consistencygroup_id": null, "snapshot_id": null, ...}}'

When I checked the code in python-cinderclient, the create method in the v3/volumes.py file included all parameters in the API request as they were without null value filtering:
body = {'volume': {'size': size, 'consistencygroup_id': consistencygroup_id, ...}}

Therefore, I decided that both projects needed to be fixed to completely resolve this bug
- python-openstackclient:adding null value filtering code
- python-cinderclient: add null value filtering logic in create method

I'd appreciate it if you could review what I analyzed and if the approach is correct. Please advise if there is anything you missed or if you need to consider other approaches.

I can see that reported behavior is reproducible.

REQ: curl -g -i -X POST http://192.168.122.198/volume/v3/volumes -H "Accept: application/json" -H "Content-Type: application/json" -H "User-Agent: python-cinderclient" -H "X-Auth-Token: {SHA256}0c54f45882461f69327151ab4928988d1b6d3f628f959ab27394802096b7da94" -d '{"volume": {"size": 1, "consistencygroup_id": null, "snapshot_id": null, "name": "testvolume", "description": null, "volume_type": null, "availability_zone": null, "metadata": {}, "imageRef": null, "source_volid": null, "backup_id": null}}'