Issue #352951 by Wim Leers, mfer, mcjim, larowlan, RobLoach, sdboyer, Owen Barton, JohnAlbin: Make JS & CSS Preprocessing Pluggable.

Issue #1890878 by corvus_ch, ygerasimov, berenddeboer, Crell, fubhy the cat, effulgentsia: Add modular authentication system, including Http Basic; deprecate global .

Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #2022549 by valdo, ParisLiakos, YesCT: Regression: No interface translation in the first installer steps.

Issue #1988508 by katbailey: Stop pretending we support Symfony bundles when we really just have service providers.

Issue #1337554 by LewisNyman, Bojhan, YesCT, Cottser, jenlampton, Xano, David_Rothstein, larowlan, nilnullvoid: Develop and use separate branding for the installer.

Issue #1668866 by ParisLiakos, aspilicious, tim.plunkett, pdrake, g.oechsler, dawehner, Berdir, corvus_ch, damiankloip, disasm, marcingy, neclimdul: Replace drupal_goto() with RedirectResponse.

Issue #1845034 by RobLoach, sandykadam, nick_schuch, cam8001, Gábor Hojtsy: Convert standard.inc to Drupal\Core\Language.

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

Issue #1888424 by katbailey, steveoliver, twistor, beejeebus, effulgentsia: Change notice: Make Drupal's URL generation logic available to HttpKernel, and minimize code repetition/divergence.

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

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

Issue #1974040 by Gábor Hojtsy: Fixed When installing in an RTL language, it should be RTL from profile selection onwards.

Issue #1905152 by Gábor Hojtsy, Jose Reyero, vijaycs85, YesCT, penyaskito: Integrate config schema with locale, so shipped configuration is translated.

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

Issue #1964224 by Gábor Hojtsy | YesCT: Fixed config during site install in other language is saved as langcode: en.

Issue #1937600 by Berdir, rootatwc | webchick: Determine what services to register in the new Drupal class.

Issue #512026 by Berdir, effulgentsia, sun, marcingy, Eric_A, xjm, katbailey, Damien Tournoud, alexpott, beejeebus, pillarsdotnet: Move () storage from cache to new state/key-value system.

Issue #1764474 by Berdir, chx, alexpott, pounard, msonnabaum: Make Cache interface and backends use the DIC.

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

Issue #1763640 by beejeebus, alexpott, Jose Reyero, c31ck, das-peter, YesCT, heyrocker, Gábor Hojtsy: Introduce config context to make original config and different overrides accessible.

Issue #1515312 by heyrocker, beejeebus, alexpott, xjm, realityloop, sun: Added snapshots of last loaded config for tracking whether config has changed.