Serialization/Deserialization UUID issue

Description: I am using django backend and celery. Redis is the queuing mechanism which we are using to connect both. When Django backend is of version redis-4.3.4 (Kombu stable version) and celery worker code is of version redis-4.4.0rc1 (Kombu alpha version) or vice versa, there is a problem in UUID serialization. When uuid is sent from django backend to redis, it is received as dictionary due to this change. Existing production code may break due to this change if they have redis=* in pip file or when there is a version mismatch between django and celery resulting in

Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/django/db/models/fields/__init__.py", line 2336, in to_python
    return uuid.UUID(**{input_form: value})
  File "/usr/local/lib/python3.8/uuid.py", line 166, in __init__
    hex = hex.replace('urn:', '').replace('uuid:', '')
AttributeError: 'dict' object has no attribute 'replace'

This change versions kombu is not backward compatible. We need to de-serialize a UUID as UUID and not a dictionary

[thedrow]

The problem with reverting this is that we don’t have a way to identify the object’s type when using the json serializer and therefore when we encounter a UUID object, we get an error since the json module doesn’t know how to serialize it. When deserializing, we need to know to which object we need to convert the value.

I’d like a test case that reproduces this error. I’m also open to suggestions on how to fix this problem.

[auvipy]

@nusnus whenever you have some time