Issue #3104265 by longwave, catch, xjm, TravisCarden: Update Composer dependencies on Doctrine components in 9.0.x

Issue #3104473 by Manuel Garcia, Mile23, greg.1.anderson, longwave, xjm: Use version of guzzlehttp/guzzle ^6.5.2

SA-CORE-2019-012 by samuel.mortenson, larowlan, pwolanin, Sam152, Jasu_M, David_Rothstein, michieltcs, Ayesh, alexpott, xjm, vijaycs85, mcdruid

Issue #2901363 by alexpott, Mile23, shubham.prakash, prithvi1972, Jaesin, cilefen, borisson_, runeasgar: Move easyrdf/easyrdf to require-dev

Issue #3084983 by plach, amateescu, catch, Berdir, xjm: Move all the code related to path aliases to a new (required) "path_alias" module

Issue #3041076 by alexpott, shaal, Gábor Hojtsy, lauriii, Wim Leers, catch, Cottser, jibran, andypost, znerol, xim, joelpittet, effulgentsia: Update Drupal 9 to Twig 2

Issue #3087531 by alexpott, jibran, gnikolovski, xjm, Mixologic: Use Diactoros LTS version 1.7, not 1.8 which is out of security coverage

Issue #3085062 by jibran, amateescu, larowlan, xjm, Berdir: Declare a conflict on pathauto versions that aren't compatible with 8.8.0

Issue #3088853 by alexpott, mondrake: Require typo3/phar-stream-wrapper ^3.1.3 and pear/archive_tar ^1.4.8 in order to support PHP 7.4

Issue #3088369 by mikelutz, alexpott, Berdir, Gábor Hojtsy, andypost, martin107, greg.1.anderson, dawehner, jibran, Wim Leers, Mile23, catch: Update Drupal 9 to Symfony 4.4-dev

Issue #3079791 by mikelutz, shaal, Wim Leers, hussainweb, xjm, catch, Charlie ChX Negyesi, Mixologic, Gábor Hojtsy, heddn, amateescu: Bump Drupal's minimum PHP version to 7.2 as soon as 9.0.x is branched (a higher version may be required later)

Issue #3079738 by lauriii, saschaeggi, webchick, xjm, andrewmacpherson, shimpy, effulgentsia, Wim Leers, DyanneNova, svettes, rainbreaw, fhaeberle, ckrina, AaronMcHale, justafish, catch, charlieweb82, AntoineH, lot007, pzajacz, kostyashupenko, jasonbarrie, antonellasevero, finnsky, worldlinemine, bnjmnm, RobLoach, Dennis Cohn, huzooka, Archita Arora, joachim, jrockowitz, benjifisher, shaal, Gábor Hojtsy, quiron, L2G2, ccasals, hampercm, if-jds, abhisekmazumdar, Kami Amiga, pivica, zrpnr, BrightBold, imalabya, jhedstrom, Neslee Canil Pinto, maliknaik, junaidmasoodi, Maithri Shetty, pranav73, mandclu, modulist, nod_, philosurfer, phenaproxima, mherchel, mlncn, rafuel92, leymannx, kiboman, Swapnil_Kotwal, anevins, evankay, rfmarcelino, thamas, brianperry, idebr, joelpittet, boulaffasae, alexpott, volkerk, DuneBL, Eli-T, Mahenkvyas22: Add Claro administration theme to core

Issue #3087531 by jibran, xjm: Use Diactoros LTS version 1.7, not 1.8 which is out of security coverage

Issue #3086148 by greg.1.anderson, hussainweb, Mixologic: Make scaffold "extra" data key conform with plugin command name

Issue #3084326 by hussainweb, greg.1.anderson: Install .editorconfig and .gitattributes at the project root

Issue #3045483 by Wim Leers, alexpott, RandomNeighbour, mikelutz, jibran: Incompatibility between zend-diactoros and psr-http-message-bridge versions: require symfony/psr-http-message-bridge >=1.1.2

Issue #3067645 by greg.1.anderson, Mile23, Mixologic: Add core scaffold assets to drupal/core's composer.json extra field

Issue #3013210 by kim.pepper, greg.1.anderson, Mile23, joachim: Add drupal/core-filesecurity component for writing htaccess files

Issue #2912387 by greg.1.anderson, Mile23, Mixologic, larowlan, jibran, alexpott, catch: Stop using wikimedia/composer-merge-plugin

Revert "Issue #2912387 by greg.1.anderson, Mixologic, Mile23, alexpott, catch: Stop using wikimedia/composer-merge-plugin"

This reverts commit 5cd26f24.

Issue #2912387 by greg.1.anderson, Mixologic, Mile23, alexpott, catch: Stop using wikimedia/composer-merge-plugin

Issue #2982684 by greg.1.anderson, Mile23, Mixologic, webflo, alexpott, yogeshmpawar, pingwin4eg, vijaycs85, larowlan, dww, borisson_, phenaproxima, kim.pepper, bojanz, grasmash, hctom, kmbremner, pingers, Jax, sherakama, derhasi, claudiu.cristea, jhedstrom, Xano, Grimreaper: Add a composer scaffolding plugin to core

Issue #2920309 by jhodgdon, Amber Himes Matz, alexpott, larowlan, andypost, vadim.hirbu, effulgentsia, diqidoq, jibran, webchick, catch, xjm, jhedstrom, Gábor Hojtsy, dawehner, Berdir, tim.plunkett, benjifisher, markcarver, yoroy, ckrina, amateescu, gnuget, webflo, Greg Boggs, yo30, vijaycs85, SenthilMohith, andrewmacpherson, EclipseGc, sandboxpl, MariaDenysyuk, tstoeckler, miro_dietiker, Mixologic, RoloDMonkey, timmillwood, Fabianx: Add experimental module for Help Topics

Issue #3057459 by Mile23, alexpott: Add composer/composer as a dev dependency of core so that we can test Composer plugins

Issue #3008870 by amateescu, kostyashupenko, mondrake, jibran, alexpott: Drop support for PHPUnit 4.8 once PHP 5 is no longer supported (8.8.x)

Issue #3053363 by alexpott, Wim Leers, Berdir, mondrake, xjm: Remove support for PHP 5 in Drupal 8.8

(cherry picked from commit 44a31bc3)

Issue #3045349 by alexpott, mikelutz, geerlingguy, catch, mglaman, larowlan: Lazy started sessions with session data are not saved with symfony/http-foundation 3.4.24

Issue #3047804 by bircher, ricardoamaro, alexpott: Add scaffolding for config_environment experimental module

Issue #3048244 by jonathan1055, alexpott, kim.pepper: Update the stable version of drupal/coder to ˆ8.3.2

Issue #3002206 by jibran, longwave, truls1502, alexpott, NickWilde: Update the stable version of drupal/coder to ˆ8.3.1

Issue #2843147 by Wim Leers, e0ipso, gabesullice, dagmar, xjm, effulgentsia, webchick, dww, Berdir, dawehner, colan, mgalalm, govind.maloo, das-peter, jludwig, ndobromirov, martin107, abhisekmazumdar, nuez, catch, amateescu, pwolanin, mallezie, borisson_, jibran, voleger, plach, GeduR, Grimreaper, apupiales, Sutharsan, RenatoG, michaellander, sergesemashko, dbt102, hampercm, dremy, rpayanm, chriscalip, tstoeckler, keopx, skyredwang, Spleshka, RajeevK, matthew.perry, kaysenlau, jazzdrive3, dsdeiz, ebeyrent, acbramley, deviantintegral, samuel.mortenson, DamienMcKenna, mohit_aghera, ibustos, dpolant, garphy: Add JSON:API to core as a stable module

Issue #3039408 by vijaycs85, WidgetsBurritos, alexpott, phenaproxima, Joseph Zhao, tstoeckler, kfritsche, mikelutz, fabpot: Updating twig/twig to v1.38.0 or v1.38.1 causes fatal error