Within Django REST framework a discussion sparked 
<https://github.com/tomchristie/django-rest-framework/issues/4353> about 
how the combination of null=True and blank=False should be handled with 
validation. What side is right in the discussion isn't the question here.

Are there cases where it makes sense to set both `null=True`, which should 
allow for `None` to be set on a field, and to set `blank=False`, which does 
not allow blank values to be set on the field?

And what is considered to be a "blank value" for a field?

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