File::isAllowed() 

\nn\t3::File()->isAllowed($filename = NULL); 

Specifies whether the file type is allowed

\nn\t3::File()->isForbidden('image.jpg'); => returns 'true'
\nn\t3::File()->isForbidden('hack.php'); => returns 'false'
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| @return boolean

Source Code 

public function isAllowed($filename = null)
{
	return !$this->isForbidden($filename);
}
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