[issue5665] Add more pickling tests

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> If no-one has any objections to the xpickle resource included in the
> latest version of the patch, I'd like to commit this soon so that we can
> be more confident in the other changes I have queued up. If I no-one
> objects, I'll commit this sometime early tomorrow morning PDT.

Ok if it doesn't take too long to run the tests (which may imply
implementing something like Raymond's suggestion of randomizing test
order, if you haven't already done so).

Thanks for your work,

cheers

Antoine.

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