formhelper password_field only takes two arguments

When I look at the docs, password_field seems to take 3 arguments.

So when I 'play around" with things and I attempt to pass three
arguments to password_field ... I get an error saying that it only takes
two parameters ("3 for 2")

I am totally lost.

This is how all of the form helper methods are. The FormBuilder object
automatically handles the first object_name argument for you.