- Patch #195416 by Damien Tournoud, David Strauss: table prefixes should be per database connection.

#551658 follow-up by pwolanin: Revert back to D6-style temporary folder logic to avoid various platform issues.

- Patch #276876 by mr.baileys: remove case sensitivity from variable names (get/set/del) through extra documentation.

- Patch #696696 by Garrett Albright, qasimzee, confiz: documentation improvements for WATCHDOG_* constants.

- Patch #692044 by Damien Tournoud, effulgentsia: a site with statistics module enabled is much slower in serving cached pages in D7 than in D6.

#331951 by aspilicious, sun, jhodgdon, Morbus, et al: Figure out and apply coding standard for casting.

#551658 by pwolanin, aaron, drewish: Move private files to an opt-in system, and no longer force private files to live within web-accessible directory.

#299308 follow-up by David_Rothstein: Fixed Installing Drupal by visiting index.php (rather than install.php) leads to a fatal error when PDO is not enabled.

#688294 by Berdir, andypost, Crell, catch: Fixed Switch from db_is_active() to proper exception catching.

- Patch #348448 by mfb, c960657, marvil07, cdale, jpmckinney: fixed PHP strict warnings when running tests and for PHP 5.3.

- Patch #642782 by plach, Dave Reid, greggles, mfb: hook_language_init() is a bootstrap hook and needs bootstrap_invoke_all().

#742246 by jbrown: Fixed Uncaught exceptions thrown in the exception handler prevent error reporting.

- Patch #756498 by douggreen: restore current directory after register_shutdown_function() callback.