Issue #2511308 by dimitriskr, ankithashetty, smustgrave, quietone, Wim Leers: Rename RendererInterface::renderPlain() to ::renderInIsolation()

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 #3373328 by catch, keshav.k, Ambient.Impact, longwave: ^10.1 CSS aggregation breaks during maintenance mode

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 #3222769 by bbrala, alexpott, longwave, Matroskeen: [November 8, 2021] Replace all list (array destructuring) assignment to the array syntax

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

Issue #2945033 by longwave, yobottehg, TMWagner, vdsh, jlatorre, catch: HtmlHeadLink processing does not allow for duplicated alternate hreflang links

Issue #2566619 by claudiu.cristea, marvin_B8, andypost, alvar0hurtad0, Mile23, joshi.rohit100, dawehner, joelpittet: Deprecate drupal_http_header_attributes()

Issue #2937888 by dhruveshdtripathi, idebr, RoSk0, mohit1604, mfernea, borisson_: Fix 'Drupal.Commenting.DocComment.LongNotCapital' coding standard

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 #2585899 by willzyx, mr.baileys, esod, dawehner: HtmlResponseAttachmentsProcessor::processHtmlHeadLink produces invalid HTTP Link header

Issue #2572693 by Mile23, andriyun, andypost, attiks: Fix 'Drupal.ControlStructures.ControlSignature' coding standard

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

Issue #2597359 by Wim Leers: Require responses with attachments to contain the final attachment values

Issue #2576533 by alexpott, stefan.r, Wim Leers, dawehner, xjm, effulgentsia, catch: Rename SafeStringInterface to MarkupInterface and move related classes

Issue #2477223 by Mile23, Wim Leers, j2r, ianthomas_uk, jaimeguzman, pjbaert: Refactor _drupal_add_html_head, drupal_get_html_head, _drupal_add_html_head_link into the attachments processor, remove from common.inc

Issue #2543340 by Wim Leers, Fabianx: Convert BlockViewBuilder to use #lazy_builder (but don't yet let context-aware blocks be placeholdered)

Issue #2551989 by Wim Leers, Crell: Move replacing of placeholders from HtmlRenderer to HtmlResponseAttachmentsProcessor

Issue #2467759 by Mile23, andypost, Wim Leers, Berdir, Fabianx, Crell: Refactor drupal_process_attached() so it doesn't depend on drupal_add_http_header()

Issue #2538274 by pwolanin, Wim Leers, dawehner: DbUpdateController has broken mainteneance mode logic, and update.php doesn't run due to aggregated JS assets

Issue #2407195 by Wim Leers, Fabianx, joelpittet, lauriii, Crell: Move attachment processing to services and per-type response subclasses