This is already fixed.

TODO

@@ -8,8 +8,3 @@ Below list contains things that should be changed/fixed/implemented.
 
 2. All builtin functions should be reworked. Actually they can return any value, sometimes of different type than declared.
    This causes errors during script execution.
-
-3. Callback variable type is broken.
- * Builtin functions expect a string or hashmap instead of callback, thus closures are not executed at all.
- * Callback takes a string with function name or closure definition. How to call other methods?
- * Class attribute of callback type cannot be called directly.