Fixed #12948. Removed a test dependency on the formatting of Decimals. Thanks, coleifer.

>>> Book.objects.filter(pk=1).annotate(mean_age=Avg('authors__age')).values_list('mean_age', flat=True)

[34.5]

>>> Book.objects.values_list('price').annotate(count=Count('price')).order_by('-count', 'price')

[(Decimal('29.69'), 2), (Decimal('23.09'), 1), (Decimal('30'), 1), (Decimal('75'), 1), (Decimal('82.8'), 1)]

>>> qs = Book.objects.values_list('price').annotate(count=Count('price')).order_by('-count', 'price')

>>> list(qs) == [(Decimal('29.69'), 2), (Decimal('23.09'), 1), (Decimal('30'), 1), (Decimal('75'), 1), (Decimal('82.8'), 1)]

True

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