textarea form field doesn't fill the default data

Hi guys,

I have a form with a textarea field. I add this textarea by this code:

$this->addTextArea('clientMessage')
             ->setRequired("mandatory")
             ->setValue("default text");

If I render this form in a latte template this way:

{input clientMessage}

the textarea is rendered correct:

<textarea  name="clientMessage" id="frmmessageForm-clientMessage" required="required" data-nette-rules="{op:':filled',msg:'mandatory'}">default text</textarea>

However if I render the textarea this way:

<textarea n:input="clientMessage"></textarea>

the textarea is rendered withou default text:

<textarea name="clientMessage" id="frmmessageForm-clientMessage" required="required" data-nette-rules="{op:':filled',msg:'mandatory'}"></textarea>

Is this bug or Do I something wrong?