Issue #2751325 by damiankloip, Grayside, dawehner, Wim Leers, catch, tedbow, alexpott, himanshu-dixit, Jo Fitzgerald, xjm, andrewbelcher, skyredwang, effulgentsia, hampercm, eelkeblok: All serialized values are strings, should be integers/booleans when appropriate

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

Issue #2502621 by Pravin Ajaaz, hussainweb, Peacog, jhodgdon, ivanjaros: Replace implement notes with inheritdoc tag

Issue #2090983 by plach, Berdir, yched: ContentEntityInterface::getTranslation() should throw an exception when an invalid language is specified

Issue #2164601 by yched, jibran, amateescu, pfrenssen: Stop auto-creating FieldItems on mere reading of $entity->field[N]

Issue #2225333 by Boobaa: LogicException in Drupal\hal\Normalizer\FieldItemNormalizer does not exist.

Issue #2223361 by Berdir, fago, tim.plunkett: Rename ComplexDataInterface::getPropertyValues() to toArray(), remove setPropertyValues().

Issue #2047229 by fago, smiletrl, Berdir, effulgentsia, amateescu: Make use of classes for entity field and data definitions.

Issue #1931976 follow-up by linclark, effulgentsia: Support deserialization for hal+json (minor nit fixes).