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

vacuum_gambit.p8

@@ -568,7 +568,7 @@ end
 function hurtbox(ship)
  local h = ship.hurt
  local x1,y1 = ship.x + h.x_off, ship.y+h.y_off
- return {x1, y1, x1+h.width, y1+h.height}
+ return {x1=x1, y1=y1, x2=x1+h.width, y2=y1+h.height}
 end
 
 function ship_m:maybe_shoot(gun)
@@ -1354,12 +1354,11 @@ end
 
 -- box: x1, y1, x2, y2
 function collides(b1, b2)
- -- x1, y1, x2, y2
 	return 
-	  b1[1]<=b2[3]
-	  and b1[2]<=b2[4]
-	  and b1[3]>=b2[1]
-	  and b1[4]>=b2[2]
+	  b1.x1<=b2.x2
+	  and b1.y1<=b2.y2
+	  and b1.x2>=b2.x1
+	  and b1.y2>=b2.y1
 end
 
 collider = mknew{
@@ -1380,8 +1379,8 @@ collider = mknew{
 }
 
 function collider_indexes(box)
- local ret, ylo, yhi = {}, box[2]\8, box[4]\8
- for x = box[1]\8, box[3]\8 do
+ local ret, ylo, yhi = {}, box.y1\8, box.y2\8
+ for x = box.x1\8, box.x2\8 do
   for y = ylo, yhi do
    add(ret, x+(y<<8))
   end