Compatible::convertType

private function convertType($value)
{
	if (is_array($value))
	{
		foreach ($value as $key => $subValue)
		{
			$value[$key] = $this->convertType($subValue);
		}
	}
	elseif (!is_bool($value))
	{
		$value = (string)$value;
	}

	return $value;
}