Serhiy Storchaka added the comment:

> I think we will still need to maintain _utc global indefinitely to keep the 
> old pickles readable.

We have no need to maintain _utc global indefinitely if don't add it.

> On the other hand, it looks like support for qualnames is only available with 
> pickle protocol 4,

No, support for qualnames now is available with all pickle protocols.

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<http://bugs.python.org/issue9051>
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