Issue #2937515 by Spokje, quietone, idebr, longwave, SherFengChong, anweshasinha, borisson_, mfernea, xjm, bbrala, daffie, Berdir: Fix Drupal.Array.Array.[ArrayClosingIndentation, ArrayIndentation] coding standard

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 #2084421 by dawehner, pwolanin, YesCT, clemens.tolboom, Berdir, Xano, Sutharsan: Phase 2 - Decouple book module schema from menu links.

Issue #2168011 by xjm, jessebeach, Damien Tournoud, znerol, Xano: Remove all 7.x to 8.x update hooks and disallow updates from the previous major version.

Issue #111715 by andypost, swentel, tim.plunkett, sun, Berdir, amateescu, kkaefer, YesCT, dagmar, chx: Convert node/content types into configuration.

Issue #1933548 by alexpott: Fixed Book allowed_types() settings repetitive and in under certain conditions can change unexpectedly.

Issue #1928082 by vijaycs85, YesCT, alexpott: Fixed Make usage of book.settings:allowed_types() consistent.

- Patch #1703164 by chriscalip, kbasarab, no_commit_credit, aspilicious: Fixed Convert book settings to the new configuration system.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #502190 by jhodgdon, stella, sun: hook implementation headers out of compliance with standards.

- Patch #306151 by agentrickard, David_Rothstein, Dave Reid, dbabbage, moshe weitzman: automatically install/uninstall schema.

- Patch #201122 by c960657, Moshe Weitzman: never write anonymous sessions, unless something has been written to . This is an important performance improvements -- as long as you use modules that use  carefully. It might be good to report some analytics about this in the performance settings page so administrators can see if there is a 'broken' module.

- Patch #245115 by kkaefer, John Morahan, JohnAlbin et al: after a long discussion we've decided to make the concatenation operator consistent with the other operators.

#199336 by JirkaRybka: remove improper t() use in update code (update goes all in English, but there were some mistakes), and add messages to updates where there was no return value otherwise, so users know what happens in each update

- Patch #164532 by catch, pwolanin, David Strauss, et al.: improve table indicies for common queries.

- Patch #163246 by keith smith, freso, O Govinda, catch, webchick et al: fixed minor spelling issues and fixed spacing issues.