title: In Symfony form, how can I check as default a ChoiceType checkbox?
body: <p>How can I make a radio button or checkbox  in a form be selected as default, without the user selecting any of them?  Obviously the users could check what they want if they wish to. I have looked in the documentation and have found the <code>preferred_choices</code> function but I believe this has another aim. Thanks in advance!</p>