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* Use ``BlockBlobService.list_blob_names`` in :meth:`simplekv.net.azurestore.AzureBlockBlobStore.iter_keys``.
This will only parse the names from Azure's XML response thus reducing CPU time
siginificantly for this function.
* They ``.keys()`` method on Python 3 now returns a list. This is in line with the documentation and the
behaviour on Python 2. It used to return a generator.