I am not sure if this has been fixed in the meantime.
Upon installing my wiki I get the following warning:
"Suhosin is installed and limits the GET parameter length to 2048 bytes. MediaWiki's ResourceLoader component will work around this limit, but that will degrade performance. If at all possible, you should set suhosin.get.max_value_length to 1024 or higher in php.ini , and set $wgResourceLoaderMaxQueryLength to the same value in LocalSettings.php"
Instead it should just say: "Suhosin is installed" since suhosin.get.max_value_length has a value >= 1024