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Removed versionadded/changed annotations for 2.1.
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@@ -577,12 +577,6 @@ To query for missing keys, use the ``isnull`` lookup::
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>>> Dog.objects.filter(data__owner__isnull=True)
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<QuerySet [<Dog: Shep>]>
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.. versionchanged:: 2.1
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In older versions, using ``None`` as a lookup value matches objects that
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don't have the key rather than objects that have the key with a ``None``
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value.
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.. warning::
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Since any string could be a key in a JSON object, any lookup other than
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