Issue #3436599 by longwave: Replace RequestCloseSubscriber with needs_destruction tag on ModuleHandler

Issue #2926070 by smustgrave, dimitriskr, andypost, gnuget, zahord, yogeshmpawar, MerryHamster, kim.pepper, alexpott, Mile23, daffie, larowlan: Deprecate ModuleHandlerInterface::getName()

Issue #3268835 by quietone, smustgrave, ravi.shankar, xjm, borisson_, catch: Fix method comments in non tests for Drupal.Commenting.DocComment.ShortSingleLine

Issue #3266568 by mxr576, sourabhjain, quietone: Refactor array_merge() usage in loops as possible for performance

Issue #2616814 by dpi, Xano, geek-merlin, Hardik_Patel_12, jofitz, alexpott, Fabianx, catch, joachim, andypost, dawehner, daffie, cweagans, neclimdul: Delegate all hook invocations to ModuleHandler

Issue #3164210 by jungle, sylus, Akhildev.cs, dww: Refactor array_merge() usage in loops as possible for performance

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

Issue #3104307 by Berdir, longwave, Gábor Hojtsy, Wim Leers, alexpott, andypost: Remove  BC layers in various Drupal\Core components

Issue #3048498 by jonathan1055, Lendude, naveenvalecha, klausi, alexpott, Gábor Hojtsy: [≈Nov. 11] Fix Drupal.Commenting.Deprecated coding standard

Issue #3000677 by catch, Shane Birley, featherbelly, alexpott: Fatal error after upgrade to 8.6x [due to regression in extension system]

Issue #2677532 by alexpott, Mile23, kim.pepper, dawehner, andypost, Eric_A, xjm, Mixologic, larowlan, phenaproxima, markcarver, borisson_: Move drupal_check_incompatibility() functionality to a new Dependency class and Version component

Issue #2901730 by mfernea, ankitjain28may, idebr: Fix 'Squiz.WhiteSpace.FunctionSpacing' coding standard

Issue #2208429 by dawehner, almaudoh, alexpott, jibran, Xano, donquixote, amitgoyal, bircher, stefan.r, Mile23, alvar0hurtad0, Berdir, andypost, larowlan: Extension System, Part III: ExtensionList, ModuleExtensionList and ProfileExtensionList

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 #2778479 by kiamlaluno: ModuleHandler::buildImplementationInfo() comment contains a reference to not existing function

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

Issue #1443308 by cilefen, joseph.olstad, mikeytown2, joelpittet, btopro, alexpott, marcingy, jonhattan, stewsnooze, tstoeckler, penyaskito: Add static cache to module_load_include()

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2359369 by mpdonadio, Berdir, bdurbin: Render cache is not cleared when module is uninstalled

Issue #2324055 by dawehner, cilefen, znerol: Split up the module manager into runtime information and extension information

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

Issue #2028109 by tim.plunkett, almaudoh, twistor, larowlan, slashrsm, Berdir, Arla, neclimdul, Cottser: Convert hook_stream_wrappers() to tagged services.

Issue #2100343 by Berdir, fago, martin107, visabhishek, sriharsha.uppuluri, Yorirou: Remove 'fieldable' key in entity definitions in favour of 'field_ui_base_route'.