Markus reported a release blocker #31842 
<https://code.djangoproject.com/ticket/31842> related with running an app 
on multiple servers with different versions of Django (3.0.x or 3.1). 
Signatures created on servers with Django 3.1 are not valid on Django 3.0, 
it's not only about signing.loads()/dumps but also about sessions etc. (see 
#27468 <https://code.djangoproject.com/ticket/27468>). We have several 
possible approaches:

   - revert commits related with #27468,
   - change the default hashing algorithm to SHA-1,
   - add the new setting for the default hashing algorithm,
   - add the "algorithm" parameter to signing.dumps()/loads() (PR13260 
   <https://github.com/django/django/pull/13260>) and ignore the rest of 
   the problem (it's probably not an option),
   - add the new setting "MIN_DJANGO_VERSION" and change the default 
   hashing algorithm if it's 3.0 or less.
   - ... (ideas are welcome)
   
Best,
Mariusz

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