code: function( a, b, aParent, bParent, prop, compares, options ) {
  		if(Array.isArray(a) && Array.isArray(b) ) {
  			var combined = makeArray(a).concat(makeArray(b));
  			// unique's the combination
  			h.doubleLoop(combined, function(item, j, cur, i){
  				var res = !compareHelpers.equal(cur, item, aParent, bParent, undefined, compares['*'], {"default": false});
  				return res;
  			});
  			options.result[prop] = combined;
  			return true;
  		}
  	}
docs: this might be expensive, but work that out later