Issue #3358402 by totten, lisotton, jensschuppe, larowlan, znerol: [regression] route defaults are now automatically route parameters

Issue #3236789 by alexpott: Drupal\Core\Controller\TitleResolver::getTitle() can result in PHP 8.1 deprecation notices due to NULL being set as placeholder values

Issue #2912169 by alexpott, tobiberlin, Berdir, dawehner, grahamC: Inject the argument resolver into HttpKernel::__construct

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

Issue #2575703 by borisson_, stefan.r, Berdir, joshi.rohit100: Remove default fall-through from PlaceholderTrait::placeholderFormat()

Issue #2079797 by ParisLiakos, Xano, amateescu, tim.plunkett: Provide a trait for $this->t() and $this->formatPlural().

Issue #2120235 by dawehner, YesCT: Regression: routing / tabs / actions / contextual links lack way to attach replacement arguments to UI strings.

Issue #2114069 by dawehner, Gábor Hojtsy, ursula: Fixed Routing / tabs / actions lack way to attach context to UI strings.

Issue #2076085 by dawehner, damiankloip, Letharion, pwolanin: Resolve the need for a 'title callback' using the route .