Secure Textfield value in UIAutomation script

Question

I have a login screen with a username field and password. In the UIAutomation script, I accessed the password field as

var passwordField = window.secureTextFields()["password"]; 

But when I accessed the passwordField value after entering the value through the uiautomation script on

 var password = passwordField.value(); 

But I get the password value as black dots (••••), i.e. as the default masking character for iPhone. How can I get the real password value?