Issue #3158130 by longwave, Berdir, voleger, mayurjadhav, ranjith_kumar_k_u, _pratik_, smustgrave, acbramley: Many calls to ContextRepository::getAvailableContexts() due to entity upcasting

Issue #3383692 by Murz, xjm, smustgrave: Document that NULL is an allowed return value for EntityRepositoryInterface::getTranslationFromContext()

Issue #3214773 by jmsosso, Spokje: Wrong type hint for getActiveMultiple() and getCanonicalMultiple() in EntityRepositoryInterface

Issue #2942907 by plach, amateescu, Berdir, tim.plunkett, hchonov, gabesullice, jibran, xjm, tedbow, timmillwood, larowlan, Sam152, pmelab, catch, effulgentsia: Entity system does not provide an API for retrieving an entity variant that is safe for editing

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

Revert "Issue #2625138 by Oleksiy, almaudoh: EntityRepository::loadEntityByUuid() implementation does not match EntityRepositoryInterface::loadEntityByUuid() @return documentation"

This reverts commit 8d6a091a.

Issue #2625138 by Oleksiy, almaudoh: EntityRepository::loadEntityByUuid() implementation does not match EntityRepositoryInterface::loadEntityByUuid() @return documentation

(cherry picked from commit 8d6a091a)

Issue #2337191 by tim.plunkett, dawehner, jibran, yched, Wim Leers, catch: Split up EntityManager into many services