Issue #2556025 by david_garcia, dawehner, -enzo-, Fabianx, catch: Make optimized class loader detection more generic to support class loaders other than ApcClassLoader

Issue #2776235 by mikeryan, alexpott: Cached autoloader misses cause failures when missed class becomes available

Issue #728702 by Crell, daffie, pillarsdotnet, pjcdawkins, Damien Tournoud, David_Rothstein, reglogge, amateescu, tim.plunkett, tstoeckler, xjm, hussainweb, alexpott, cweagans, Tor Arne Thune, catch: Visiting index.php should redirect to install.php if settings.php already has database credentials but database is empty

Issue #2756175 by Fabianx: FileCacheFactory::get() should not use 'default' configuration key before passed in configuration

Issue #2730129 by klausi, jibran, dawehner: DrupalKernel must never persist service_container for Symfony 3 update

Revert "Issue #2730129 by klausi, jibran, dawehner: DrupalKernel must never persist service_container for Symfony 3 update"

This reverts commit bfdc7b52.

Issue #2730129 by klausi, jibran, dawehner: DrupalKernel must never persist service_container for Symfony 3 update

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2648562 by gapple, neclimdul: Symfony's ApcClassLoader requires APC backwards compatibility layer

Issue #2614202 by alexpott, felribeiro, dawehner, catch: CoreServiceProvider::registerUuid() assumes all environments have the same functions available

Issue #2572601 by attiks, alexpott, tatarbj: Fix 'Drupal.Classes.ClassCreateInstance' coding standard

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

Issue #2348219 by Fabianx, dawehner, webchick, Berdir, damiankloip, joelpittet, gnuget: You have requested a non-existent service "cache.backend.null"

Issue #2550519 by klausi, nullkernel, cweagans, alexpott, pwolanin, neclimdul: Crypt::randomBytes() doesn't actually return cryptographically secure random bytes

Issue #2605726 by edxxu, rakesh.gectcr: Wrong @return doc for \Drupal\Core\DrupalKernel::getModuleFileNames()

(cherry picked from commit a20c8c4f)

This reverts commit 991e1433.

Issue #2605388 by rakesh.gectcr, anil280988, mahavir003, aneeshthankachan: Comment Typos in DrupalKernel.php

Issue #2497243 by Fabianx, znerol, fgm, Wim Leers, darol100, jhedstrom, hussainweb, pfrenssen, neclimdul, jibran, Nitesh Sethia, dawehner, chx, catch, benjy, Aki Tendo: Replace Symfony container with a Drupal one, stored in cache

Issue #2304461 by dawehner, neclimdul, naveenvalecha, jibran, tim.plunkett, phenaproxima, Xano, hussainweb, sun, hitesh-jain, amateescu, alexpott, daffie, Mile23, Wim Leers, larowlan: KernelTestBaseTNG™

Issue #2529514 by dawehner, Fabianx, Wim Leers: Replace system.filter::protocols with container parameters

Issue #2528292 by Fabianx, dawehner: Decouple Error testing from relying on a cached on disk-container that is created by a different Kernel

Issue #2493665 by Fabianx, dawehner, msonnabaum, catch: Add centralized container invalidation method