Issue #3109970 by znerol, andypost, Prashant.c, daffie, Wim Leers, dww, catch: Convert uses of $_SESSION in forms and batch

Issue #3379885 by catch, Wim Leers: Use MessagesCommand in BigPipe to remove special casing of the messages placeholder

Issue #3401730 by kim.pepper, smustgrave, longwave: Add default autoconfigure to all *.services.yml and remove event_subscriber tags

Issue #3353210 by mondrake, PrabuEla, Spokje: [PHPUnit 10] @dataProvider methods must be declared static and public

Issue #3404508 by mstrelan, smustgrave, quietone: Fix strict type errors in Functional tests: Add casts and fix types where needed

Issue #3390178 by godotislate, larowlan, catch, pixlkat, Utilvideo, rsnyd, Wim Leers, cilefen, smustgrave, fjgarlin, jakegibs617, seixas, mohithasmukh, very_random_man: big_pipe sometimes fails to load blocks

Issue #3410022 by heddn, larowlan, catch: Regression from #3295790 content-length header set earlier than expected

Issue #3363420 by kim.pepper, longwave, quietone: Use CallableResolver for \Drupal\Core\Render\Renderer::doCallback()

Issue #3379121 by quietone, longwave: Skip spellcheck for 20 nonsense words that are parts of hashes

Issue #3377570 by catch, Wim Leers, mglaman, marcelovani, Kingdutch: Add PHP Fibers support to BigPipe

Issue #2441811 by longwave, daffie, andypost, edurenye, lauriii, joseph.olstad, Wim Leers, smustgrave, effulgentsia, alexpott, larowlan, chx, jibran: Upgrade filter system to HTML5

Issue #3386458 by catch, quietone, alexpott, larowlan: Add GenericModuleTestBase and use it to test general module things

Issue #3362456 by NickDickinsonWilde, Wim Leers, borisson_: Fix all ExtensionExistsConstraint constraint violations in tests

Issue #3362457 by Wim Leers, NickDickinsonWilde: Fix all PluginExistsConstraint constraint violations in tests

Issue #2921133 by quietone, VladimirAus, xjm, ankithashetty, longwave, Prem Suthar, smustgrave, benjifisher, AaronMcHale: Remove "Please" from the codebase

Issue #3354382 by mondrake: [PHPUnit 10] Provide a static viable alternative to $this->prophesize() in data providers

Issue #3353658 by mondrake, smustgrave: [PHPUnit 10] Provide a static alternative to randomMachineName() and implement in data providers

Issue #3328454 by xjm, Bhanu951, jidrone, smustgrave: Replace most strpos() !== FALSE or === FALSE with str_contains()

Issue #2632750 by Wim Leers, bnjmnm, krlucas, ronaldtebrake, zaporylie, mherchel, Fabianx, webchick, yogeshchaugule8, catch, darol100, yoroy, Bojhan, Gábor Hojtsy: Interface previews/skeleton screens through optional "preview" or "placeholder" templates

Issue #3185640 by lucienchalom, jungle, smustgrave, ravi.shankar, andregp, xjm, quietone, sergiogsanchez: Fix or ignore words that start with "v", excluding real non-English words

Issue #3265574 by mondrake: Convert remaining assertions involving use of xpath to WebAssert, where possible

Issue #2937515 by Spokje, quietone, idebr, longwave, SherFengChong, anweshasinha, borisson_, mfernea, xjm, bbrala, daffie, Berdir: Fix Drupal.Array.Array.[ArrayClosingIndentation, ArrayIndentation] coding standard

Issue #1014086 by catch, nod_, martin107, quietone, dww, mariacha1, Spokje, yogeshmpawar, pounard, Wim Leers, mfer, mikeytown2, mbutcher, moshe weitzman, Fabianx, borisson_, alexpott, donquixote, sun, andypost, dawehner: Stampedes and cold cache performance issues with css/js aggregation

Issue #3270835 by xjm, Wim Leers, lauriii: Move BigPipe's CKEditor 4 regression test to the CKEditor module

Issue #3239738 by Theresa.Grannum, danflanagan8, Wim Leers: BigPipe FunctionalJavascript tests should not rely on Classy

Issue #3131348 by Spokje, jungle, mondrake, vsujeetkumar, sja112, kishor_kolekar, Hardik_Patel_12, mrinalini9, yogeshmpawar, daffie: Replace assertions involving calls to empty() with assertEmpty()/assertNotEmpty()/assertArrayNotHasKey()

Issue #3232097 by daffie, longwave: [Symfony 6] Add "array" type hint to methods overriding Symfony\Component\EventDispatcher\EventSubscriberInterface::getSubscribedEvents()