diff --git a/godot/core/arrays.nim b/godot/core/arrays.nim
index 414ac99..a2b4580 100644
--- a/godot/core/arrays.nim
+++ b/godot/core/arrays.nim
@@ -62,16 +62,16 @@ proc newArray*(pba: PoolByteArray): Array {.inline.} =
   new(result, arrayFinalizer)
   initGodotArray(result.godotArray, pba.godotPoolByteArray[])
 
-proc `[]=`*(self: var Array; idx: int; value: Variant) {.inline.} =
+proc `[]=`*(self: Array; idx: int; value: Variant) {.inline.} =
   self.godotArray[idx.cint] = value.godotVariant[]
 
 proc `[]`*(self: Array; idx: int): Variant {.inline.} =
   newVariant(self.godotArray[idx.cint])
 
-proc add*(self: var Array; value: Variant) {.inline.} =
+proc add*(self: Array; value: Variant) {.inline.} =
   self.godotArray.add(value.godotVariant[])
 
-proc clear*(self: var Array) {.inline.} =
+proc clear*(self: Array) {.inline.} =
   self.godotArray.clear()
 
 proc count*(self: Array; value: Variant): int {.inline.} =
@@ -80,7 +80,7 @@ proc count*(self: Array; value: Variant): int {.inline.} =
 proc isEmpty*(self: Array): bool {.inline.} =
   self.godotArray.isEmpty()
 
-proc erase*(self: var Array; value: Variant) {.inline.} =
+proc erase*(self: Array; value: Variant) {.inline.} =
   self.godotArray.erase(value.godotVariant[])
 
 proc first*(self: Array): Variant {.inline.} =
@@ -101,28 +101,28 @@ proc contains*(self: Array; value: Variant): bool {.inline.} =
 proc hash*(self: Array): Hash {.inline.} =
   hash(self.godotArray.godotHash())
 
-proc insert*(self: var Array; pos: int; value: Variant) {.inline.} =
+proc insert*(self: Array; pos: int; value: Variant) {.inline.} =
   self.godotArray.insert(pos.cint, value.godotVariant[])
 
-proc reverse*(self: var Array) {.inline.} =
+proc reverse*(self: Array) {.inline.} =
   self.godotArray.reverse()
 
-proc popLast*(self: var Array): Variant {.inline.} =
+proc popLast*(self: Array): Variant {.inline.} =
   newVariant(self.godotArray.popLast())
 
-proc popFirst*(self: var Array): Variant {.inline.} =
+proc popFirst*(self: Array): Variant {.inline.} =
   newVariant(self.godotArray.popFirst())
 
-proc addLast*(self: var Array; value: Variant) {.inline.} =
+proc addLast*(self: Array; value: Variant) {.inline.} =
   self.godotArray.addLast(value.godotVariant[])
 
-proc addFirst*(self: var Array; value: Variant) {.inline.} =
+proc addFirst*(self: Array; value: Variant) {.inline.} =
   self.godotArray.addFirst(value.godotVariant[])
 
-proc delete*(self: var Array; idx: int) {.inline.} =
+proc delete*(self: Array; idx: int) {.inline.} =
   self.godotArray.delete(idx.cint)
 
-proc setLen*(self: var Array; size: int) {.inline.} =
+proc setLen*(self: Array; size: int) {.inline.} =
   self.godotArray.setLen(size.cint)
 
 proc rfind*(self: Array; what: Variant; fromIdx: int): int {.inline.} =
@@ -131,7 +131,7 @@ proc rfind*(self: Array; what: Variant; fromIdx: int): int {.inline.} =
 proc len*(self: Array): int {.inline.} =
   self.godotArray.len.int
 
-proc sort*(self: var Array) {.inline.} =
+proc sort*(self: Array) {.inline.} =
   self.godotArray.sort()
 
 iterator items*(self: Array): Variant =
diff --git a/godot/core/dictionaries.nim b/godot/core/dictionaries.nim
index 5445d27..9897814 100644
--- a/godot/core/dictionaries.nim
+++ b/godot/core/dictionaries.nim
@@ -30,7 +30,7 @@ proc len*(self: Dictionary): int {.inline.} =
 proc isEmpty*(self: Dictionary): bool {.inline.} =
   self.godotDictionary.isEmpty()
 
-proc clear*(self: var Dictionary) {.inline.} =
+proc clear*(self: Dictionary) {.inline.} =
   self.godotDictionary.clear()
 
 import variants, arrays
@@ -48,7 +48,7 @@ proc contains*(self: Dictionary; key: Variant): bool {.inline.}=
 proc contains*(self: Dictionary; keys: Array): bool {.inline.} =
   self.godotDictionary.contains(keys.godotArray[])
 
-proc del*(self: var Dictionary; key: Variant) {.inline.} =
+proc del*(self: Dictionary; key: Variant) {.inline.} =
   self.godotDictionary.del(key.godotVariant[])
 
 proc hash*(self: Dictionary): Hash {.inline.} =
@@ -71,7 +71,7 @@ proc `[]`*(self: Dictionary; keyStr: string): Variant {.inline.} =
   godotStr.deinit()
   godotVariant.deinit()
 
-proc `[]=`*(self: var Dictionary; key, value: Variant) {.inline.} =
+proc `[]=`*(self: Dictionary; key, value: Variant) {.inline.} =
   self.godotDictionary[key.godotVariant[]] = value.godotVariant[]
 
 proc `==`*(self, other: Dictionary): bool {.inline.} =
diff --git a/godot/core/poolarrays.nim b/godot/core/poolarrays.nim
index dd3f544..6d412f5 100644
--- a/godot/core/poolarrays.nim
+++ b/godot/core/poolarrays.nim
@@ -33,29 +33,29 @@ template definePoolArray(T, GodotT, DataT, fieldName, newProcName, initProcName;
     new(result, poolArrayFinalizer)
     initProcName(result.fieldName, arr.godotArray[])
 
-  proc add*(self: var T; arr: T) {.inline.} =
+  proc add*(self: T; arr: T) {.inline.} =
     self.fieldName.add(arr.fieldName)
 
-  proc delete*(self: var T; idx: int) {.inline.} =
+  proc delete*(self: T; idx: int) {.inline.} =
     self.fieldName.delete(idx.cint)
 
-  proc reverse*(self: var T) {.inline.} =
+  proc reverse*(self: T) {.inline.} =
     self.fieldName.reverse()
 
-  proc setLen*(self: var T; size: int) {.inline.} =
+  proc setLen*(self: T; size: int) {.inline.} =
     self.fieldName.setLen(size.cint)
 
   proc len*(self: T): int {.inline.} =
     self.fieldName.len.int
 
   when not noData:
-    proc add*(self: var T; data: DataT) {.inline.} =
+    proc add*(self: T; data: DataT) {.inline.} =
       self.fieldName.add(data)
 
-    proc insert*(self: var T; idx: int; data: DataT): Error {.inline.} =
+    proc insert*(self: T; idx: int; data: DataT): Error {.inline.} =
       self.fieldName.insert(idx.cint, data)
 
-    proc `[]=`*(self: var T; idx: int; data: DataT) {.inline.} =
+    proc `[]=`*(self: T; idx: int; data: DataT) {.inline.} =
       self.fieldName[idx.cint] = data
 
     proc `[]`*(self: T; idx: int): DataT {.inline.} =
@@ -115,17 +115,17 @@ definePoolArray(PoolStringArray, GodotPoolStringArray, string,
                 godotPoolStringArray, newPoolStringArray,
                 initGodotPoolStringArray, true)
 
-proc add*(self: var PoolStringArray; data: string) =
+proc add*(self: PoolStringArray; data: string) =
   var s = data.toGodotString()
   self.godotPoolStringArray.add(s)
   s.deinit()
 
-proc insert*(self: var PoolStringArray; idx: int; data: string): Error =
+proc insert*(self: PoolStringArray; idx: int; data: string): Error =
   var s = data.toGodotString()
   result = self.godotPoolStringArray.insert(idx.cint, s)
   s.deinit()
 
-proc `[]=`*(self: var PoolStringArray; idx: int; data: string) =
+proc `[]=`*(self: PoolStringArray; idx: int; data: string) =
   var s = data.toGodotString()
   self.godotPoolStringArray[idx.cint] = s
   s.deinit()