TYPO3.Fluid

I'm not sure if this is a bug or just the way it is supposed to work. Maybe this should be filed under Fluid or not, I'm not sure. I made changes to my extBase model in order to make it work.

Here is an example scenario:

class Myobj {
/**
 * iampretty
 * @param boolean
 */
 protected $iampretty;

 // standard getter/setter
}

/**
 * Show a form to create a new object
 *
 * @param Tx_Myext_Domain_Model_Myobj $myobj A new object that is yet to be created
 * @return string A form for providing the objects properties.
 */
function newAction($myobj = NULL) {
    $this->view->assign('myobj',$myobj);
}

<f:form method="post" controller="Example" action="create"  name="myobj" object="{myobj}">

    <f:form.checkbox property="iampretty" value="1" /> Am I pretty?

<f:/form>

This throws an exception: #1243325768: No value found for key "Tx_Fluid_ViewHelpers_FormViewHelper->formObject"

However, if I modify my newAction to look like this, then the error isn't thrown:

function newAction($myobj = NULL) {
    if ($myobj == NULL) {
        $myobj = t3lib_div::makeInstance('Tx_Myext_Domain_Model_Myobj');
    }
    $this->view->assign('myobj',$myobj);
}

But there is a different issue! Here is how the checkbox renders:

Checkbox viewhelpers can only be bound to properties of type boolean or array. Property "iampretty" is of type "NULL".

I can make this go away by adding this constructor to my domain object:

public function __construct() {    
    $this->iampretty = false;
}

Now everything works! I'm just not sure if it this is how it is supposed to work.