Array
    (
    [account]
       [notify] => Array
                    (
                        [#type] => checkbox
                        [#title] => Notify user of new account
                        [#access] => 1
                    )
    
    )

I want to checkbox on user_registration_form must be checked by default.
I did `$form['account']['notify']['#default_value'] = array(1);` but it does't work.Suggest something.