* SpecialPrefixindex methods namespacePrefixForm() and showPrefixChunk() have
been made protected. They were accepting form variance arguments, this is now
using properties in the SpecialPrefixindex class.
+* (bug 50310) BREAKING CHANGE: wikibits: Drop support for mwCustomEditButtons.
+ It defaults to an empty array and emits mw.log.warn when accessed.
== Compatibility ==