According to http://noc.wikimedia.org/conf/CommonSettings.php.txt $wgDisableHardRedirects is set to "true" for all Wikimedia wikis.
This setting prevents redirects to Special pages, among other things. For example, http://wikimediafoundation.org/wiki/Comments doesn't redirect properly currently.
This global setting in Wikimedia's configuration file is contrary to the default setting for a MediaWiki install. On a fishbowl wiki like wikimediafoundation.org, it shouldn't be an issue to set $wgDisableHardRedirects = false;.
It probably wouldn't be an issue to do it for all private/fishbowl wikis, but that's not as much of a concern (to me, at least).
Version: unspecified
Severity: trivial