Issue #1914366 by vijaycs85, Gábor Hojtsy, alexpott: Move all configuration schema files into a schema subdirectory.
Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.
Issue #1793074 by cweagans, sun, chx: Convert .info files to YAML.
Issue #1875086 by Crell, plach, effulgentsia, sun, msonnabaum, Rob Loach, quicksketch, David_Rothstein: Change notice: Improve DX of drupal_container()->get().
Issue #1938030 by dawehner: Replace View's usage of drupal_container()->get() with Drupal::service().
Issue #1922178 by vijaycs85, Gábor Hojtsy: Fixed issues in contact module configuration schema.
Issue #1942120 by sandipmkhairnar: Fixed Make Contact module active config save format match the default yml file.
Issue #1947810 by vijaycs85: some string/label types improperly assigned in configuration schemas.
Issue #1944674 by damiankloip, dawehner: Improve performance of ViewsDataCache.
Issue #1374116 by amateescu, swentel, Berdir, yched: Move bundle CRUD API out of Field API.
Issue #1946366 by kim.pepper: Convert confirm_form() in contact.admin.inc to the new form interface.
Issue #1947814 by vijaycs85, Gábor Hojtsy, tim.plunkett: Fixed New config entities often save as langcode: und incorrectly.
Issue #1964254 by vijaycs85, YesCT | Gábor Hojtsy: Fixed Configuration schemas missing langcode and uuid at places.
Issue #1967294 by tim.plunkett: Add a dedicated @EntityType annotation.
Issue #1807042 by tim.plunkett, effulgentsia: Rename entity storage/list/form/render controllers to handlers, part 1: organize existing annotation keys.
Issue #1391694 by tim.plunkett, aspilicious, fago, pounard, plach, Crell, msonnabaum, tstoeckler: Use type-hinting for entity-parameters.
Issue #1946404 by tim.plunkett, amateescu, swentel: Convert forms in field_ui().admin.inc to the new form interface.
Issue #1913618 by tim.plunkett, amateescu: Convert EntityFormControllerInterface to extend FormInterface.
Issue #1982984 by larowlan: Create Drupal::entityManager for improved DX.
Issue #1982088 by tim.plunkett: Remove hook_entity_bundle_info()'s need for 'real path'.