> Append form's non_field_errors with message like

Given that the IntegrityError doesn't occur until the point of .save(), 
it's not obvious how that'd work in terms of the Forms API.
You're absolutely correct that there's a class of constraints that can fail 
here, but it's not evident to me that dealing with these explicitly when 
required (in practice, fairly rare) isn't a better tack.

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