[issue19256] Optimize marshal format and add version token.

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

We have done so previously and should continue to do that.  Thanks for pointing out that the new SHORT_REF needs that fix :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19256>
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