is_deeply for better feedback on AoA comparisons
is_deeply for better feedback on AoA comparisons

Also added test for .combinations default of powerset.

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