Charles-François Natali added the comment:

> Well it is customary for callback-based APIs to hold strong references to 
> their callbacks. If a library wants to avoid leaks, it should register a 
> single callback which will then walk the current "live" resources and protect 
> them.

I guess that the custom usage makes sense.
I'd just like a note in the doc, if possible ;-)

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<http://bugs.python.org/issue16500>
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