More union tests, intersection tests.
More union tests, intersection tests.

zostay/roast,laben/roast,dogbert17/roast,b2gills/roast,skids/roast,dankogai/roast,cygx/roast,cygx/roast,laben/roast,cygx/roast,bitrauser/roast,b2gills/roast,b2gills/roast,zostay/roast,dogbert17/roast,skids/roast,dankogai/roast,bitrauser/roast,zostay/roast,dankogai/roast,skids/roast,niner/roast,niner/roast,niner/roast,laben/roast,perl6/roast