My 2 cents, I think @johan's suggestion makes sense.
if obj in queryset:
It's very pythonic. it should do what __len__ does and cache it, if you
want the single quick db query you can always use exists().
ps @roger
>>> timeit.timeit('m.GL.objects.filter(pk=x.pk)', setup='import
myapp.models as m;x = m.GL.objects.all()[324]', number=100)
0.05818330496549606
is not doing anything, add a `.exists()` or `len(..)` or something to evaluate
the queryset. That number is WAY too low.
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