BadRequest can't return JSON?

I am trying to return a JSON object along with a 400 error code. This correctly returns the object (e.g. {"email": ["A user with that email address already exists."]}:

return HttpResponse(json.dumps(dict(form.errors.items())))

Whereas these all just returns an unreadable (by javascript) object ([object Object]):

return BadRequest(json.dumps(dict(form.errors.items())))
return HttpResponseBadRequest(json.dumps(dict(form.errors.items())))
return BadRequest(json.dumps(dict(form.errors.items())), content_type='application/json')

I've tried several other methods of sending an error code but the results were the same. How do I get the readable object along with a 400 Bad Request error code?

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