Issue #1852454 by patrickd, xjm, YesCT, Berdir, amateescu, Pancho, djroshi, dealancer, Wim Leers, jessebeach: Restrict module and theme name lengths to 50 characters.

Issue #1987262 by the_phi, clemens.tolboom, Damien Tournoud, bshaffer: [Installation Error] Symfony: "The service definition 'request' does not exist.".

Issue #1825332 by Berdir, ParisLiakos, andypost, dawehner, jrglasgow, aspilicious: Introduce an AccountInterface to represent the current user.

Issue #1813762 by ParisLiakos, Jose Reyero, YesCT, japicoder, attiks: Introduce unified interfaces, use dependency injection for interface translation.

Issue #1811520 by JacobSanford, lirantal: Add section tags to theme, hook_menu, and t documentation.

Issue #1818570 by Berdir, effulgentsia, das-peter, andypost: Convert users to the new Entity Field API.

Issue #1984766 by sdboyer, Niklas Fiekas, msonnabaum: Fixed Start relying on Request/Response objects for cache handling.

Issue #1957154 by joates, ayelet_Cr, xjm | Berdir: Replace calls to drupal_container()->get('module_handler()') service with Drupal::moduleHandler().

Issue #1998466 by dawehner, ParisLiakos: Convert filter_xss_admin() and similar function to an Xss component.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1961870 by Cottser, foopang, kgoel, shanethehat, tlattimore, c4rl, joelpittet, thedavidmeister: Convert page.tpl.php to Twig.

Issue #1827448 by RobLoach, sun, jbrown, tstoeckler: Use __DIR__ instead of DRUPAL_ROOT where possible/sensible.

Issue #1938670 by ParisLiakos, Xano, RobLoach, pp, alexpott: Convert unicode.inc to \Drupal\Component\Utility\Unicode.

Issue #1936166 by markpavlitski: Add documentation to module_invoke functions about passing by value

Issue #842216 by Devin Carlson, valthebald | jhodgdon: Remove $installed_profile global variable left over from D6.

Issue #1847768 by rootatwc, tim.plunkett, effulgentsia, Crell, Damien Tournoud: Remove ip_address().

Issue #1938972 by msonnabaum, RobLoach, tsphethean, dawehner, rootatwc: Start moving string functions into a utility class.

Issue #1739986 by RobLoach, pwolanin, sun, moshe weitzman, andypost: Fix fallback in drupal_get_hash_salt(), move it to bootstrap.inc, use instead of ['drupal_hash_salt()'].

Issue #1949724 by chx, effulgentsia, xjm, jibran, rootatwc: Allow simpletest child sites to additionally load a test-specific settings.php to allow testing anonymous and configless updates.

Issue #1935970 by msonnabaum, dawehner, RobLoach: Convert timer_* to a utility class and convert tests to phpunit.

Issue #1875086 by Crell, plach, effulgentsia, sun, msonnabaum, Rob Loach, quicksketch, David_Rothstein: Change notice: Improve DX of drupal_container()->get().

Issue #1853086 by katbailey, msonnabaum, alexpott: Remove cache.page.enabled in favor of an explicit internal cache setting.