is intl not a must for setup?

[max]

I installed hashover over the following setup.php code:

        // Required extensions to check for
	// 'date', 'dom', 'json', 'mbstring', 'openssl', 'pcre', 'intl'
	protected $extensions = array (
		'date', 'dom', 'json', 'mbstring', 'openssl', 'pcre'
	);

so , is intl a must for setup?