Replaces "istype"s with is_helpers macros (#28676)

code/modules/holodeck/area_copy.dm

@@ -13,7 +13,7 @@ GLOBAL_LIST_INIT(duplicate_forbidden_vars,list("tag","area","type","loc","locs",
 
 	if(perfectcopy && O && original)
 		for(var/V in original.vars - GLOB.duplicate_forbidden_vars)
-			if(istype(original.vars[V],/list))
+			if(islist(original.vars[V]))
 				var/list/L = original.vars[V]
 				O.vars[V] = L.Copy()
 			else if(istype(original.vars[V],/datum))
@@ -21,12 +21,12 @@ GLOBAL_LIST_INIT(duplicate_forbidden_vars,list("tag","area","type","loc","locs",
 			else
 				O.vars[V] = original.vars[V]
 
-	if(istype(O, /obj))
+	if(isobj(O))
 		var/obj/N = O
 		if(holoitem)
 			N.resistance_flags = LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF // holoitems do not burn
 
-		if(nerf && istype(O,/obj/item))
+		if(nerf && isitem(O))
 			var/obj/item/I = O
 			I.damtype = STAMINA // thou shalt not
 
@@ -98,12 +98,12 @@ GLOBAL_LIST_INIT(duplicate_forbidden_vars,list("tag","area","type","loc","locs",
 
 		for(var/obj/O in T)
 			var/obj/O2 = DuplicateObject(O , perfectcopy=TRUE, newloc = B, nerf=nerf_weapons, holoitem=TRUE)
-			if(!O2) 
+			if(!O2)
 				continue
 			copiedobjs += O2.GetAllContents()
 
 		for(var/mob/M in T)
-			if(istype(M, /mob/camera)) 
+			if(istype(M, /mob/camera))
 				continue // If we need to check for more mobs, I'll add a variable
 			var/mob/SM = DuplicateObject(M , perfectcopy=TRUE, newloc = B, holoitem=TRUE)
 			copiedobjs += SM.GetAllContents()

code/modules/holodeck/computer_funcs.dm

@@ -93,7 +93,7 @@
 /obj/machinery/computer/holodeck/proc/derez(var/obj/obj, var/silent = 1, var/forced = 0)
 	// Emagging a machine creates an anomaly in the derez systems.
 	if(obj && src.emagged && !src.stat && !forced)
-		if((ismob(obj) || istype(obj.loc,/mob)) && prob(50))
+		if((ismob(obj) || ismob(obj.loc)) && prob(50))
 			spawn(50) .(obj,silent) // may last a disturbingly long time
 			return
 	spawned.Remove(obj)

code/modules/holodeck/items.dm

@@ -119,7 +119,7 @@
 		..()
 
 /obj/structure/holohoop/CanPass(atom/movable/mover, turf/target, height=0)
-	if (istype(mover,/obj/item) && mover.throwing)
+	if (isitem(mover) && mover.throwing)
 		var/obj/item/I = mover
 		if(istype(I, /obj/item/projectile))
 			return