initialization is very slightly faster this way, I think

collision_profiling.p8

@@ -350,14 +350,12 @@ prof(function(b1,b2)
 	  and b1[3]>=b2[1]
 	  and b1[4]>=b2[2]
 end,function(b1, b2)
- local b1x1, b1y1, b1x2, b1y2 = unpack(b1)
- local b2x1, b2y1, b2x2, b2y2 = unpack(b2)
 	return 
-	  b1x1<=b2x2
-	  and b1y1<=b2y2
-	  and b1x2>=b2x1
-	  and b2y2>=b2y1
-end,{ locals={{1,1,1,1},{1,1,1,1}} })
+	  b1.x1<=b2.x2
+	  and b1.y1<=b2.y2
+	  and b1.x2>=b2.x1
+	  and b1.y2>=b2.y1
+end,{ locals={{1,1,1,1,x1=1,x2=1,y1=1,y2=1},{1,1,1,1,x1=1,x2=1,y1=1,y2=1}} })
 
 -- "locals" (optional) are
 -- passed in as args. see the