src/jdk/nashorn/internal/codegen/types/IntType.java

@@ -70,11 +70,11 @@
         super("int", int.class, 2, 1);
     }
 
     @Override
     public Type nextWider() {
-        return LONG;
+        return NUMBER;
     }
 
     @Override
     public Class<?> getBoxedType() {
         return Integer.class;