ITupleNode signature change

Src/AST/Myc.Ast.Analysis.Purity.pas

@@ -135,14 +135,14 @@ end;
 
 function TPurityAnalyzer.VisitTuple(const Node: IAstNode): Boolean;
 var
-    i: Integer;
     T: ITupleNode;
 begin
     T := Node.AsTuple;
     // A tuple is pure if ALL its elements are pure.
-    for i := 0 to T.Count - 1 do
+    // Optimization: Use Elements array directly
+    for var item in T.Elements do
     begin
-        if not IsNodePure(T.Items[i]) then
+        if not IsNodePure(item) then
             exit(False);
     end;
     Result := True;