Issue #3128982 by davidwbarratt, Spokje, andypost, Barryvdh, larowlan, catch, alexpott: Upgrade asm89/stack-cors to ^2.0 to fix cacheability

Issue #3231416 by mherchel, ankithashetty, Gauravmahlawat, chetanbharambe, davidwbarratt: Olivero should not expect its default menu blocks to always exist

Issue #2443165 by davidwbarratt, amateescu, HOG, kostyashupenko, yched, Berdir, andypost, alexpott, tstoeckler, xjm: Drupal\Core\Entity\EntityInterface\ContentEntityStorageBase::doCreate() assumes that the bundle is a string

Issue #2765959 by davidwbarratt, Wim Leers, dawehner, borisson_, tstoeckler, tedbow, catch: Make 4xx REST responses cacheable by (Dynamic) Page Cache + comprehensive cacheability test coverage

Issue #2920001 by Wim Leers, dawehner, borisson_, aheimlich, davidwbarratt: Add cacheable HTTP exceptions: Symfony HTTP exceptions + Drupal cacheability metadata

Issue #2337283 by hussainweb, Mile23, alexpott, aleksip, dawehner, heykarthikwithu, naveenvalecha, Crell, xjm, davidwbarratt, Fabianx, jhedstrom, tim.plunkett, larowlan, tstoeckler: Add a composer.json file to every component

Issue #2682705 by davidwbarratt, alexpott, vprocessor, miiimooo, milesw: Migrate process plugin does not save stubs to the idmap, leads to duplicates and broken references

Issue #1475510 by timmillwood, hussainweb, davidwbarratt, alexpott, Mile23, pfrenssen, claudiu.cristea, webchick, catch, Crell, patcon, RobLoach, kim.pepper, dawehner, neclimdul, Mixologic, gagarine, sun, nod_, effulgentsia, drumm, Sylvain Lecoy, jhedstrom, katbailey, xjm, klausi, Seldaek, Barryvdh: Remove external dependencies from the core repo and let Composer manage the dependencies instead

Revert "Issue #1475510 by timmillwood, hussainweb, davidwbarratt, Mile23, pfrenssen, claudiu.cristea, webchick, Crell, catch, patcon, RobLoach, dawehner, sun, kim.pepper, gagarine, effulgentsia, drumm, katbailey, Sylvain Lecoy, Mixologic, jhedstrom: Remove external dependencies from the core repo and let Composer manage the dependencies instead"

This reverts commit c6c69134.

Issue #1475510 by timmillwood, hussainweb, davidwbarratt, Mile23, pfrenssen, claudiu.cristea, webchick, Crell, catch, patcon, RobLoach, dawehner, sun, kim.pepper, gagarine, effulgentsia, drumm, katbailey, Sylvain Lecoy, Mixologic, jhedstrom: Remove external dependencies from the core repo and let Composer manage the dependencies instead

Issue #2380389 by webflo, Mile23, davidwbarratt, timmillwood, hussainweb, tstoeckler, bojanz, yched, MKorostoff, alexpott, webchick: Use a single vendor directory in the root

Issue #1975220 by davidwbarratt, tstoeckler, mradcliffe, RobLoach, Mile23, hussainweb: Allow a Composer user to manage Drupal, modules, and PHP dependencies with a custom root composer.json