[Python-3000] Is pickle's persistent_id worth keeping?

[Jesus Cea]

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Jim Fulton wrote:
> Pickle always memoized objects.  persistent_id is useful for  
> separating data over multiple pickles as is done in a database.  IOW,  
> as its name implies, it is primarily useful for persistence systems.   
> I don't think that ZODB is the only persistence system built on  
> pickle, but perhaps I'm wrong.
> 
> I  suspect ZODB is also the primary user of the pickle module.

Durus, another (excellent) persistence system for Python also uses this
method.

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