Florent Xicluna <florent.xicl...@gmail.com> added the comment:

OK, but it yields Python 3 DeprecationWarning in the subclass.
And there's no workaround to get rid of the deprecation. 

If it is the correct behaviour, maybe some words could be added about 
subclassing builtin types:
http://docs.python.org/reference/datamodel.html#additional-methods-for-emulation-of-sequence-types

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<http://bugs.python.org/issue8529>
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