Issue #3205480 by alexpott, andypost, Wim Leers, catch, kim.pepper, longwave: Drop PECL YAML library support in favor of only Symfony YAML

Issue #3048495 by jonathan1055, quietone, rajandro, Spokje, Pooja Ganjage, andypost, kishor_kolekar, msuthars, munish.kumar, ankithashetty, ayushmishra206, ravi.shankar, naveenvalecha, longwave, Gábor Hojtsy, alexpott, smustgrave, Lendude, xjm, adityasingh, daffie: Fix Drupal.Semantics.FunctionTriggerError coding standard

Issue #3260401 by idebr, Spokje, Akram Khan, mcdruid, longwave, alexpott: Google is abandoning FLoC - so remove the header

Issue #3294695 by daffie, longwave, mkalkbrenner, pandaski: Drupal 8 BC for database driver namespace fails for replicas

Issue #3284502 by effulgentsia, alexpott: [regression] Drupal 9.4 breaks BC via incorrect autoloading of \Drupal\Driver\* overrides of core db drivers

Issue #3261248 by paulocs, andregp, andypost, longwave, quietone: Remove deprecated user.module functions

Issue #3049048 by danflanagan8, ndobromirov, mglaman, bbrala, alexpott, Wim Leers, gabesullice: Invalid JSON:API responses when maintenance mode is on

Issue #3129043 by mondrake, daffie, ankithashetty, ravi.shankar, alexpott, Beakerboy, catch: Move core database drivers to modules of their own

Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator

Issue #2903911 by joshmiller, longwave, anmolgoyal74, ankithashetty, init90, Pooja Ganjage, _gradient_, daffie, borisson_: Fix 'Drupal.Commenting.FunctionComment.ParamMissingDefinition' coding standard

Issue #3151093 by dww, cburschka, Manisha111, alexpott, longwave: Replace use of whitelist/blacklist in \Drupal\Core\Security\RequestSanitizer and its test

Issue #3151094 by dww, jungle, ravi.shankar, alexpott: Replace use of whitelist/blacklist in \Drupal\Core\Template classes and their tests

Issue #3163226 by dww, jungle, alexpott, larowlan, longwave, cburschka: Add the ability to deprecate a Settings name

Issue #3120096 by alexpott, daffie, effulgentsia, Neslee Canil Pinto, xjm, mondrake, catch, ravi.shankar: Support contrib database driver directories in a fixed location in a module

Issue #3020296 by alexpott, longwave, bradjones1, catch, Berdir, gapple: Remove Symfony's classloader as it does not exist in Symfony 4

Issue #2831065 by andypost, alexpott, mpdonadio, longwave, Berdir: Remove BC layer from \Drupal\Core\DrupalKernel::getInstallProfile()

Issue #2980712 by bircher, alexpott, yogeshmpawar, mpotter, borisson_: Define config directory in settings

Issue #2975328 by alexpott, Gábor Hojtsy, borisson_: Install profile in settings.php and mismatch check makes re-installs of Drupal hard

Issue #2926309 by vaplas, alexpott, mpdonadio, tacituseu, Mixologic: Random fail due to APCu not being able to allocate memory

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2210521 by mitrpaka, vlad.n, Ema.jar, donquixote, dawehner, klausi, alexpott: Settings::getInstance() should throw an exception if called before being initialized

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2575495 by webflo, Mile23, hussainweb: Invalidate APCu Class Loader automatically if necessary

Issue #2384675 by sidharrell, cilefen, Mile23, damiankloip, dawehner, Wim Leers, alexpott, neclimdul: Deprecate conf_path()

Issue #2474909 by alexpott, mpdonadio, znerol, catch, Wim Leers, Berdir: Allow Simpletest to use the same APC user cache prefix so that tests can share the classmap and other cache objects

Issue #2463321 by amateescu: Serializing the database connection is dangerous and error-prone, make it unserializable again

Issue #2347877 by znerol, Berdir: Move DrupalKernel::initializeCookieGlobals() into a SessionConfiguration service

Issue #2199795 by andypost, twistor, martin107, larowlan, andyceo: Make the Settings class prevent serialization of actual settings

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2288665 by znerol: Remove _maintenance request attribute and replace it with a maintenance mode service.