+* $wgExceptionHooks has been removed.
+* $wgShellLocale is now applied for all requests. wfInitShellLocale() is
+ deprecated and a no-op, as it is no longer needed.
+* WikiPage::getParserOutput() will now throw an exception if passed
+ ParserOptions would pollute the parser cache. Callers should use
+ WikiPage::makeParserOptions() to create the ParserOptions object and only
+ change options that affect the parser cache key.