Not autosaving add form for node types

On the content type edit form for my "blog entry" node type the language next to the check box enabling Autosave reads "Enable Autosave to add/edit forms for this node type." This leads me to believe that Autosave is supposed to work for the form on the /node/add/blog path, the "add" form for the blog entry content type. However Autosave does not seem to be doing so. I am not seeing any notifications, there are no entries in the DB reflecting that path, and, if I enter a post, navigate away and then go back to the /node/add/blog page I am not presented with any autosaved content.

Also, it looks like this line in the code:

    if ( (variable_get('autosave_'. $form['type']['#value'], 0) == 1) && 
          ( (arg(0) == 'node' && is_numeric(arg(1)) && arg(2) == 'edit') || (arg(0) == 'node' && arg(1) == 'add') )
        ) 

should be allowing autosave for the form on /node/add/blog... any idea what's up?

Thanks,
Brady