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  et al.  Can you say 'registry'?  Drupal now maintains an internal registry of
  all functions or classes in the system, allowing it to lazy-load code files as
  needed (reducing the amount of code that must be parsed on each request). The
  list of included files is cached per menu callback for subsequent loading by
  the menu router. This way, a given page request will have all the code it needs
  but little else, minimizing time spent parsing unneeded code.

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.

- Patch #215858 by pwolanin, goba, catch et al: localized menu link data getting saved back to the database.

- Patch #184926 by Rob and brightloudnoise: improved usability of status message when site is offline.

- Patch #211979 by chx, theborg, pwolanin, et al: menu items show no matter where their parent is found.

#215858 by pwolanin: localized menu options were saved into the database, avoid this by using different variable names / array keys

#215127 by chx, webernet, catch; testing by theborg: menu item parenting was broken when moving menu items

#210479 by catch, dvessel: add newlines to list items, so inline display and RTL issues are resolved

#202955 by chx: menu_rebuild() needs to be called after maintenance mode, because stale data might end up in menu tables in maintenance mode

#205843 report by asimmonds, patch by chx: menu_valid_path() was used as an API function, but was located in menu.module, move to menu.inc

#50901 by chx: do not allow user login under maintenance mode, if the logged in user has no site config permission