The documentation comments for $wgOpenIDServerStoreType and $wgOpenIDConsumerStoreType say valid values are 'file', 'memcached', and 'db'. But https://www.mediawiki.org/wiki/Extension:OpenID says the only valid value is 'file', and "memc" is no longer valid.
I hope that https://www.mediawiki.org/wiki/Extension:OpenID is out of date and 'memcached' is supported, so this can be a simple doc fix. Writing to the local filesystem won't work too well when subsequent requests may be sent to other servers in the cluster.
Version: master
Severity: normal