Lots more KeySet tests, inspired by the Set tests.  Also fudge for Niecza.
Lots more KeySet tests, inspired by the Set tests.  Also fudge for Niecza.

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