Hi!

I am experiencing a weird Queryset behavior. Let the variable treatments refer 
to an ordered (and sliced) queryset. The first query 

Service.objects.filter(treatment__in=treatments).distinct()

returns different objects than the second one

Service.objects.filter(treatment__in=list(treatments)).distinct()

, but I would expect both results to be the same. Service model declares 
treatment field as ForeignKey.

The results given by the first query are incorrect. Further SQL code 
inspection reveals that ORDER BY clause (from treatments QuerySet) is missing 
in subselect. 

The results of the second query are correct, since subquery is evaluated first 
(with ORDER BY clause included). 

It actually looks similar to an old bug #12328, which was marked as fixed long 
time ago and I am using Django 1.6. Am I missing something?

Many Thanks,
Gregor

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