Revert "pls"

This reverts commit 8c97511871.

code/modules/holodeck/area_copy.dm

@@ -5,6 +5,7 @@ GLOBAL_LIST_INIT(duplicate_forbidden_vars,list(
 	))
 
 /proc/DuplicateObject(atom/original, perfectcopy = TRUE, sameloc = FALSE, atom/newloc = null, nerf = FALSE, holoitem=FALSE)
+	RETURN_TYPE(original.type)
 	if(!original)
 		return
 	var/atom/O
@@ -122,7 +123,7 @@ GLOBAL_LIST_INIT(duplicate_forbidden_vars,list(
 
 	if(toupdate.len)
 		for(var/turf/T1 in toupdate)
-			T1.CalculateAdjacentTurfs()
+			CALCULATE_ADJACENT_TURFS(T1)
 			SSair.add_to_active(T1,1)
 
 

code/modules/holodeck/turfs.dm

@@ -21,7 +21,7 @@
 
 /turf/open/floor/holofloor/plating/burnmix
 	name = "burn-mix floor"
-	initial_gas_mix = "o2=2500;plasma=5000;TEMP=370"
+	initial_gas_mix = BURNMIX_ATMOS
 
 /turf/open/floor/holofloor/grass
 	gender = PLURAL