HStoreField can't adapt type 'dict'

I know it's very early release, but I'd expect the example from the docs to work. I started playing with HStoreField from django.contrib.postgres.fields, and get the error above. Model Dog is copied verbatim from https://docs.djangoproject.com/en/dev/ref/contrib/postgres/fields/#querying-hstorefield, and then in the shell, 

    >>> from atest.models import Dog

    >>> Dog.objects.create(name='Rufus', data={'breed': 'labrador'})

    ...

        return self.cursor.execute(sql, params)

    django.db.utils.ProgrammingError: can't adapt type 'dict'

At that moment,

    sql = 'INSERT INTO "atest_dog" ("name", "data") VALUES (%s, %s) RETURNING "atest_dog"."id"'

    params = ('Rufus', {'breed': 'labrador'})

So, everything should be completely normal - yet, HStoreField somehow doesn't know how to accept dict, despite docs saying that it's exactly what it should accept. Does anyone have any advice? Has anyone tried to do something with HStoreField?

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