show_in_menu doesn't work with int value

[truongwp]

The show_in_menu parameter in register_post_type() function doesn't work with int value (or some other value which be treated as true if convert to boolean). I tried to use 1 instead of true, some other parameters work except show_in_menu. The problem is WordPress use Not Identical operator instead of Not Equal to check the value of show_in_menu when render admin menu items.