Nette\Neon\Decoder::addValue PHP Method

    private function addValue(&$result, $key, $value)
    {
        if ($key === NULL) {
            $result[] = $value;
        } elseif ($result && array_key_exists($key, $result)) {
            $this->error("Duplicated key '{$key}'");
        } else {
            $result[$key] = $value;
        }
    }