Issue #3420981 by kim.pepper, quietone, mstrelan, Berdir, alexpott: Convert FieldType plugin discovery to attributes

Issue #3416700 by catch, penyaskito, lamp5: Handle invalid compressed ajax_page_state more gracefully

Issue #3419186 by Ruturaj Chaubey, phthlaap, balintpekker, smustgrave: Add a hook_ENTITY_TYPE_form_mode_alter()

Issue #3414563 by quietone, catch, smustgrave, andypost, Spokje: Add new 10.3.x database dump fixtures, without modules deprecated for removal in 11.x

Issue #3437325 by narendraR, phenaproxima, alexpott, Wim Leers: Add validation constraints to system.date

Issue #3439671 by catch, alexpott: StandardPerformanceTest::testAnonymous is hard to get to pass locally

Issue #3439932 by phenaproxima, narendraR, Wim Leers, larowlan: Add validation constraints to system.image and system.image.gd

Issue #3427564 by phenaproxima, Wim Leers, alexpott, omkar.podey, Berdir, smustgrave, larowlan: Require `langcode: …` only for simple config that contains translatable values

Issue #3303557 by Binoli Lalani, quietone, catch, Tom Konda, smustgrave: Deprecate and remove the AJAX replace method

Issue #540008 by kristiaanvandeneynde, Spokje, daffie, clayfreeman, alexpott, eelkeblok, michaelfavia, ianthomas_uk, zaporylie, johnwebdev, abhisekmazumdar, anmolgoyal74, greggles, quietone, shaal, catch, rivimey, AaronMcHale, Berdir, ndf, xjm, finne, Wim Leers, esolitos, heddn, webchick, Bojhan, andypost, efpapado, benjifisher, lauriii, Gábor Hojtsy, moshe weitzman, harings_rob: Add a container parameter that can remove the special behavior of UID#1

Issue #3402294 by mstrelan, quietone, dww, smustgrave: Fix strict type errors: Convert FormattableMarkup to strings (complex replacement) in core Kernel tests

Issue #3426506 by kim.pepper, smustgrave, mstrelan, alexpott: Create enums for File exists options and deprecate consts

Issue #3432183 by catch, andypost, longwave: Move system/base component CSS to respective libraries where they exist

Issue #2862702 by larowlan, hswong3i, mohit_aghera, perfectcu.be, markhalliwell, mxr576, dscl, alexpott, smustgrave: PrepareModulesEntityUninstallForm::formTitle does not exist

Issue #3437162 by plopesc, smustgrave, Berdir: Move twig_debug and other development toggles into raw key/value

Issue #3421016 by quietone, godotislate: Convert MigrateProcessPlugin plugin discovery to attributes

Issue #3257457 by DieterHolvoet, scott_euser, smustgrave, ankithashetty, alexpott, larowlan, Berdir, dww: AmbiguousBundleClassException if multiple entity types share the same class

Issue #3409456 by plopesc, smustgrave, quietone, e0ipso, catch: Remove SDC deprecated code before 11.0.0

Issue #3413508 by Jelle_S, taraskorpach, acbramley, smustgrave, alexpott, Eugen Zerr: Admin page access denied even when access is given to child items

Issue #2575105 by Berdir, catch, longwave, quietone, kristiaanvandeneynde, andypost, alexpott, mathilde_dumond, pradhumanjain2311, amateescu, Wim Leers, xjm: Use cache collector for state