When using @group keyword, grouping is not peformed,
and items are shown in no particular order. 

sort and sortrev methods of metakit PyView object,
expect sequences of Property objects, like here:

sorted = view.sortrev((view.assignedto,), (view.name,)).

Roundup back_metakit.py, supplies lists of strings:

sorted = view.sortrev([ 'assignedto', ], [ 'name' ]);

which is interpreted improperly.

The attached file demonstrates a simple session log
with metakit database, demonstrating this issue with
view.sortrev behaviour.

I found no references in mk4py that sortrev accepts
sequences of strings as arguments, so I consider this
to be back_metakit.py bug.