Don't force the result of adding two sets to be a Union. #280#281

Merged

goehle merged 1 commit intoopenwebwork:developfrom dpvc:issue280

Aug 30, 2016

+1-1

Commits on Aug 29, 2016

Don't force the result of adding two sets to be a Union (in particular, let it be a Set). Resolves issue openwebwork#280 .
dpvc
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