Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

Revert "Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings"

This reverts commit ea9cc753.

Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

Revert "Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings"

This reverts commit ff7c5de3.

Issue #3425337 by mondrake: Fix root namespace classes DebugClassLoader forward compatibility warnings

Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator

Issue #2903911 by joshmiller, longwave, anmolgoyal74, ankithashetty, init90, Pooja Ganjage, _gradient_, daffie, borisson_: Fix 'Drupal.Commenting.FunctionComment.ParamMissingDefinition' coding standard

Issue #3104307 by Berdir, longwave, Gábor Hojtsy, Wim Leers, alexpott, andypost: Remove  BC layers in various Drupal\Core components

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

Issue #2392845 by amateescu, nuez, seanB, Alumei, penyaskito, vprocessor, steveoliver, lokapujya, tim.plunkett, yched, Sam152, Wim Leers, jibran, kristiaanvandeneynde, Berdir, larowlan, hchonov, fago: Add a trait to standardize handling of computed item lists

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

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

Issue #2488568 by Jose Reyero, alexpott, Gábor Hojtsy, tstoeckler: Add a TypedDataManagerInterface and use it for typed parameters

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

Issue #2365585 by yched: FieldItemList::filterEmptyItems() renumbers deltas but does not update the Items

Issue #2002134 by fago, yched, amateescu, effulgentsia: Move TypedData metadata introspection from data objects to definition objects.

Issue #2132145 by plopesc, amateescu, Xano: Rename 'typed_data' / Drupal::typedData() to 'typed_data_manager' / Drupal::typedDataManager.

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

Issue #1868004 by fago, das-peter, Berdir, EclipseGc, fubhy the cat, dixon_: Improve the TypedData API usage of EntityNG.

This reverts commit 172318fb.

Issue #1845546 by fago, EclipseGc, attiks, effulgentsia: Implement validation for the TypedData API.

Issue #1877632 by fago, jhodgdon: Improve comments and clean-up code for EntityNG and the TypedData API.

Issue #1869250 by fago, Berdir, das-peter, YesCT, mradcliffe, fubhy: Various EntityNG and TypedData API improvements.

Issue #1825568 by alexpott, fago, Berdir: Fixed Random test failure in Drupal\system\Tests\Entity\EntityFormTest.