Maybe someone could apply this patch (updated to match rev 4159, minimal
changes); currently I can't do it myself...

BTW,

 from roundup.anypy.sets_ import set
 ...
 set(...)

should perform better than

 import sets
 sets.Set(...)

for at least two reasons:

- the builtin set type performs better than sets.Set
- dots are evaluated at run time
<http://wiki.python.org/moin/PythonSpeed/PerformanceTips#Avoidingdots...>