[issue19256] Optimize marshal format and add version token.

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Should we support serialization in an older version? For example,
> disable the new SMALL and ASCII tokens?

It is officially supported with the "version" parameter:
http://docs.python.org/3.4/library/marshal.html#marshal.dump

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