R. David Murray added the comment:

We never promise that the messages won't change (they are not part of the API), 
so that part isn't a problem.  We do try to be backward compatible there when 
it comes to args beyond the message text.  I don't think unpickleability is an 
issue; at least there isn't any discussion of it in PEP 3161, and I don't 
remember any around the implementation.

I think this is fine.  I don't think we should worry about someone who is 
actually using rawval/rest pulled out of the exception args.  You could put a 
porting note in What's New, but my guess is that the chances of anyone being 
inconvenienced by this are pretty near to zero.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21159>
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