public function handle($severity, $message, $filename, $lineno)
    {
        if (
            E_DEPRECATED === $severity ||
            E_USER_DEPRECATED === $severity ||
            0 === $this->isolator->error_reporting()
        ) {
            $fallbackHandler = $this->fallbackHandler();

            return $fallbackHandler($severity, $message, $filename, $lineno);
        }

        throw new ErrorException($message, $severity, $filename, $lineno);
    }