Issue #2159369 by ParisLiakos: Move aggregator_refresh() and most of ->removeItems() logic to a service.

Issue #1878302 by martin107, InternetDevels, nick_daffodil, chrisroane: Use 'delete' over 'remove' in the aggregator module.

Issue #2181549 by tstoeckler, andypost: Provide a StringLong field item with schema type 'text' without a 'format' column.

Issue #2145103 by Berdir, das-peter, fago, amateescu: Provide non-configurable field types for entity created, changed and timestamp fields.

Issue #2114707 by Berdir, yched, amateescu, effulgentsia, fago: Allow per-bundle overrides of field definitions.

Issue #2119905 by damiankloip, tim.plunkett, Berdir: Provide @ConfigEntityType and @ContentEntityType to have better defaults.

Issue #2149841 by drastik, xjm, amateescu: The 'aggregator_feed' entity type doesn't have a UUID field.

Issue #2142979 by Gábor Hojtsy, LinL, k4v, plach: Entity label langcode argument is a lie, incompatible with current API.

Issue #2004244 by Berdir, plach, tim.plunkett, msonnabaum, das-peter: Move entity revision, content translation, validation and field methods to ContentEntityInterface.

Issue #2051923 by Berdir, dixon_, plach: Rename \Drupal\Core\Entity\Field\Field, related subclasses and interfaces to *FieldItemList.

Issue #2087995 by amateescu: All entity post*() and pre*() methods should call their parent implementation.

Issue #1847002 by tim.plunkett, effulgentsia, msonnabaum: Move entity type classes from Drupal$provider\Plugin\Core\Entity to Drupal$provider\Entity.

Issue #2001202 by DmitryDrozdik, ebeyrent: Replace drupal_container() with Drupal::service() in the aggregator module.

Issue #1893772 by chx, fubhy, slashrsm: Move entity-type specific storage logic into entity classes.

Issue #1391694 by tim.plunkett, aspilicious, fago, pounard, plach, Crell, msonnabaum, tstoeckler: Use type-hinting for entity-parameters.

Issue #1807042 by tim.plunkett, effulgentsia: Rename entity storage/list/form/render controllers to handlers, part 1: organize existing annotation keys.

Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.

Issue #293318 by alex_b, Berdir, rootatwc, Aron Novak, mustafau, akahn: Convert Aggregator feeds into entities.