feature flag will likely be removed before 1.29 is released.
* (T158474) "Unknown user" has been added to $wgReservedUsernames.
* (T156983) $wgRateLimitsExcludedIPs now accepts CIDR ranges as well as single IPs.
+* $wgDummyLanguageCodes is deprecated. Additional language code mappings may be
+ added to $wgExtraLanguageCodes instead.
=== New features in 1.29 ===
* (T5233) A cookie can now be set when a user is autoblocked, to track that user