The pickle format has no such proviso. Why don't you just make the "serial version number" part of the object's attributes, to be pickled right along with the rest? Then the "notification" can be trivially had by comparing actual and desired version -- don't see why it should be a PITA.
Yeah, that's the direction I think we are going to take. I think I may have overestimated the level of effort required to add in and check this data. Since we restore all our saved state in one place, adding whatever logic we need (dealing with unversioned objects or objects who were previously unversioned and now are shouldn't be too bad).
Just though I would ping the community to see if pickle provided this behaviour and I was reinventing the wheel. – Paul Osborne Mar 2 '10 at 19:57.
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