Issue #2514196 by pameeela, Aki Tendo, Lendude, lauriii: AliasManager->getAliasByPath() handles $path in confusing manner

Issue #2858897 by ericgsmith, smustgrave, schlaukopf, fabiansierra5191, tobiasb, ben.kyriakou, RoSk0, rpayanm, _utsavsharma, Dakwamine, xjm, larowlan, Aki Tendo, tim.plunkett, longwave, mxh, alexpott: Block name collision on theme creation

Issue #2514960 by Aki Tendo, catch: \Drupal\Core\Theme\Registry->build() does not always return \Drupal\Core\Utility\ThemeRegistry

Issue #2558079 by Aki Tendo, Jo Fitzgerald, Wim Leers, borisson_: Assertions in DrupalTemplateTwigExtension

Issue #2853503 by Aki Tendo, alexpott, larowlan, Wim Leers, klausi, fgm, dawehner, mondrake, catch, Berdir, neclimdul, borisson_: Remove all assert('string') calls from Drupal core because deprecated in PHP 7.2

Issue #2570285 by mr.baileys, cpj, stefan.r, alexpott, nlisgo, joelpittet, Aki Tendo, borisson_, chx, dawehner, s_leu, Berdir: Make sure TranslatableMarkup accepts string values only

Issue #2454649 by Aki Tendo, dawehner: Cache Optimization and hardening -- [PP-1] Use assert() instead of exceptions in Cache::merge(Tags|Contexts)

Issue #2579095 by Aki Tendo: Create Inspector::assertStringable - a shorthand for (is_string($string) || (is_object($string) && method_exists($string, '__toString')

Issue #2565671 by joyceg, Aki Tendo: Misspelling in core/modules/simpletest/src/Tests/SimpleTestTest.php

Issue #2497243 by Fabianx, znerol, fgm, Wim Leers, darol100, jhedstrom, hussainweb, pfrenssen, neclimdul, jibran, Nitesh Sethia, dawehner, chx, catch, benjy, Aki Tendo: Replace Symfony container with a Drupal one, stored in cache

Issue #2408013 by Aki Tendo, alexpott, Fabianx, dawehner, Crell, jhodgdon, Wim Leers, aspilicious: Adding Assertions to Drupal - Test Tools

Issue #2509898 by dawehner, znerol, larowlan, lauriii, Aki Tendo, Wim Leers: Additional uncaught exception thrown while handling exception after service changes

Issue #2474363 by Aki Tendo, alexpott, Dom., MattA, dawehner, TR, hass, Wim Leers, cburschka, Berdir: Stuck in failed module install process