Issue #598586 by grendzy, deekayen, matglas86, dawehner, Zgear: Fixed watchdog() assumes  is defined.

- Patch #917134 by hbergin: dblog_cron() deletes too many records when auto_increment() is larger than 1.

- Patch #502190 by jhodgdon, stella, sun: hook implementation headers out of compliance with standards.

#600974 by effulgentsia, JohnAlbin, sun, and Damien Tournoud: Allow theme functions to take one argument without any hacks. NOTE: This is an API change in hook_theme().

- Patch #572618 by effulgentsia, pwolanin, sun: all theme functions should take a single argument. Code clean-up and performance improvement. Woot.

#497118 by chx, catch, pwolanin, JoshuaRogers, and Jacob Singh: Remove the function registry. While the hope was that this would result in improved performance for low-end hosts, it comes at the expense of critical development experience problems and less benefit than something like APC. Class registry remains intact to facilitate autoloading.

Of all the patches to accidentally commit without a message. :( Rolling back registry rip. Let's try that again.

- Patch #302268 by tizzo, bubbasan, Ryan Palmer et al: converted module to new database abstraction layer.

#8 by sun and most of #drupal: Users can now cancel their accounts. Fixing the 8th issue, almost 8 years later, on January 8th, after working 8 days full-time on it. GREAT WORK :D

- Patch #310212 by justinrandell, catch, et all: killed  in _user hook, as well as two small kittens.

- Patch #225450 by Crell, chx, bjaspan, catch, swentel, recidive et al: next generation database layer for Drupal 7.

  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 #241629 by solotandem: the cron.php query left an extra row in the watchdog table due to a off-by-one error.