Issue #2968519 by alexpott, amateescu, martin107: The entity.query service is essentially deprecated because it relies on \Drupal\Core\Entity\Query\QueryFactory which is

Issue #2849669 by alexpott, pwolanin, Munavijayalakshmi, dawehner: Fix \Drupal\Component\Utility\Unicode() because of the Symfony mbstring polyfill

Issue #2960611 by msankhala, dmitryl, benjifisher: Change lookupSourceID and lookupDestinationID to lookupSourceId and lookupDestinationId in the Migrate module

Issue #2909367 by iKb, zaporylie, mfernea: Fix 'Drupal.Commenting.VariableComment.DuplicateVar' coding standard

Issue #2572791 by Mile23, andriyun, attiks, RoSk0: Fix 'Drupal.WhiteSpace.OpenBracketSpacing' coding standard

Issue #2488860 by alexpott, dawehner, catch, Mile23, jgeryk, claudiu.cristea, daffie, jibran: Bring phpunit bridge into drupal and use it for unit tests and simpletest to handle Deprecation

Issue #2824610 by quietone, Jo Fitzgerald, ohthehugemanatee, heddn, catch: Rename DedupeBase/DedupeEntity process plugins to MakeUnique and add documentation

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 #2389335 by Berdir, naveenvalecha, claudiu.cristea, almaudoh, joachim, jibran: Deprecate entity.query service and replace with using the entity storage's getQuery() method

Issue #2690001 by quietone, vasi, mikeryan, infopicard, phenaproxima: Migrate: Don't deduplicate forum vocabulary

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

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

Issue #2260121 by sun: PHPUnit Tests namespace of modules is ambiguous with regular runtime namespace (+ Simpletest tests).

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2213451 by andypost, bdone, benjy, penyaskito, chx, claudiu.cristea, damiankloip, gregboggs, InternetDevels, jessehs, jhedstrom, marvil07, mikeryan, pcambra, Xano, YesCT: Update Migrate API in core