Some comments from the relevant tickets:

from Volker Braun:
> You are not supposed to update the pickle jar, it is only here to ensure 
> backward compatibility. If at all possible, you should be using the 
> register_unpickle_override to work around the change and unpickle into the 
> new class. 

from Nicolas M. ThiƩry:
> Just my 2 cents: at this point, partition tuples are a rather peripheral 
> feature. If anyone has saved some pickle containing one, most likely he is in 
> the Sage-Combinat group. Well most likely it's Andrew actually. So I vote for 
> not wasting Andrew's time and simply dropping backward compatibility in that 
> particular situation. I am not taking much risk by volunteering to help 
> whoever might have trouble with such an old pickle :-) 

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