Antoine Pitrou added the comment:

> "I actually agree with Kristjan that an opcode is the least disruptive
> choice here."
> 
> Does you mean that data serialized with python 3.3 can be read with
> python 3.4? But not the opposite (version token unknown in Python
> 3.3)?

Yes, indeed. I'm not sure it's very important but it's safer in case
people have old "frozen" modules around.

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<http://bugs.python.org/issue19256>
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