Return an AlterReturn object when you want to change the result returned from the core method to the caller. Useful for Do.after subscribers.
Do.AlterReturnmsg
                    
                newRetVal
                    
                
                
                Defined in
                
            
        
        
        event-custom/js/event-do.js:322
        
        
msg
                        String
                    
                    
                    (optional) Explanation of the altered return value
newRetVal
                        Any
                    
                    
                    Return value passed to code that invoked the wrapped function.