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�CloudInitPickleMixina�Scaffolding for versioning of pickles.

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    The current version of a class's pickle should be set in the class variable
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    On unpickle, the object's state will be restored and then
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Persist instance state, adding a pickle version attribute.

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        remaining state into the current instance, and then calls
        ``self._unpickle`` with the version (or 0, if no version is found in
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Perform any deserialization fixes required.

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