I was just running into an issue where I append an error to _non_form_errors in a formset. (Maybe I should re-think that.) Anyway, it happens in the clean method, and I end up calling the clean method twice. Lo and behold, the error message gets appended twice and the user sees a duplicate error message. Then I got to thinking, why isn't _non_form_errors a set? And I thought maybe you guys had a thought about this. It would seem superfluous to have the same error message listed more than once in the error list.
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