This syntax is deprecated and the color is ignored: write ':is true; <<#palegreen>>' instead of '#palegreen:is true;' This syntax is deprecated and the color is ignored: write ':is false; <<#pink>>' instead of '#pink:is false;' ["0",0,false,null,true,"1",1,""] test of 'v' test of 'v == %true()' is true is false is true is false is true is false is true is false is true is false is true is true is true is true is false is false