Issue #2112759 by effulgentsia: Add ContentEntityInterface::hasField().
Issue #2062761 by tim-e, larowlan, jhodgdon, ifrik, pameela: Update hook_help() for custom_block() modules.
Issue #2092265 by andypost, Xano, amateescu: Fix type-hinting for FieldInfo methods.
Issue #2051385 by jhedstrom: Expand phpunit tests for \Drupal\Component\PhpStorage.
Issue #2098795 by tim.plunkett, Sean Charles, tstoeckler, dawehner, larowlan, damiankloip: Create Base Class for RouteSubscriber Class.
Issue #2050835 by Berdir | yched: Move Widget, Formatter, and FieldType plugin types to the Core\Field system.
Issue #2115145 by Berdir | effulgentsia: Move field type plugins to Plugin/Field/FieldType.
Issue #2011082 by jiff, phiit, swentel, pfrenssen: Replace drupal_container() with Drupal::service() in the field module.
Issue #2105983 by mr.baileys, jhodgdon, vijaycs85, a_thakur: Make sure all YML files in Search module have no type-casting to string.
Issue #2061929 by likin, m1r1k, robmc, InternetDevels: Remove calls to deprecated global  from language.module.
Issue #1982256 by mortendk, rteijeiro, tim.plunkett, LewisNyman, tlattimore, yannickoo, ry5n: Clean up html.html.twig markup.
Issue #2106783 by bneil: Move node_requirements() to node.install.
Issue #338403 by klausi, jhodgdon, grisendo, YesCT, drewish: Use {@inheritdoc} on all class methods (including tests).
Issue #421294 by superspring: Fixed non-ascii character in function theme_user_signature()().
Issue #2116827 by Wim Leers: Speed up RenderTest: move integration tests into separate test.
Issue #2107137 by dawehner, damiankloip, tim.plunkett: Fix the DX for declaring custom access checkers.
Issue #2115077 by longwave: Remove unused _block_themes_access().
Issue #2112233 by alexpott, amateescu: Remove unnecessary ternaries in around config()->get().
Issue #2080617 by slv_: Remove Unused local variable  from /core/modules/field/field.form.inc.