Document::normalizeValue

protected function normalizeValue($value, bool $isConvertToString = false)
{
	$result = $value;

	if(is_array($value) || is_bool($value))
	{
		$result = '';
	}
	elseif($isConvertToString && $value instanceof Value)
	{
		$result = $value->getValue();
		if(is_object($result) || is_array($result) || is_bool($result))
		{
			$result = $value->toString();
		}
	}

	return $result;
}