Issue #3489416 by quietone, lavanyatalwar, shalini_jha, smustgrave, borisson_: Fix Drupal.Commenting.FunctionComment.MissingReturnComment in non-tests

Issue #3198340 by alexpott, xjm, Mile23, cilefen, mmjvb, catch, Mixologic, effulgentsia, mfb, longwave, larowlan, greg.1.anderson, Warped, quietone: Strict constraints in drupal/core-recommended make it harder for Composer-managed sites to apply their own security updates when a core update is not available

Issue #3134648 by alexpott, dww, greg.1.anderson, hussainweb, catch, xjm: Don't pin the composer/installers version in drupal/core-recommended

Issue #3090906 by alexpott, greg.1.anderson, ravi.shankar, xjm, Mixologic, Mile23: self.version in metapackages considered harmful

Issue #3090684 by Mixologic, greg.1.anderson, opdavies, alexpott: Rename drupal/dev-dependencies and drupal/pinned-dev-dependencies

Issue #3087626 by greg.1.anderson, Mixologic, jibran, Mile23, alexpott, xjm: Convert drupal/core-recommended & c. into a subtree split