Issue #3328457 by xjm, dimitriskr: Replace most substr($a, $i) where $i is negative with str_ends_with()

Issue #3153567 by geek-merlin, ankithashetty, smustgrave, rkoller: Wrap backtrace of UI warnings/notices in a details element

Issue #2921133 by quietone, VladimirAus, xjm, ankithashetty, longwave, Prem Suthar, smustgrave, benjifisher, AaronMcHale: Remove "Please" from the codebase

Issue #2941148 by quietone, bruno.bicudo, ravi.shankar, Sweetchuck, beatrizrodrigues, lucienchalom, VitaliyB98, WagnerMelo, sophiavs, ankitjain28may, daffie, longwave, Sutharsan, borisson_, cosmicdreams, heykarthikwithu, catch: Fix Drupal.Commenting.FunctionComment.MissingReturnType

Issue #3222769 by bbrala, alexpott, longwave, Matroskeen: [November 8, 2021] Replace all list (array destructuring) assignment to the array syntax

Issue #3222251 by bbrala, longwave: [November 8, 2021] Replace all isset constructs with the null coalescing operator

Issue #3206168 by JeroenT, longwave: "install_display_output" expects 2 arguments, but 3 were provided

Issue #2002514 by dawehner, mondrake, damiankloip, RobLoach, ParisLiakos, joachim, Krzysztof Domański, gaurav.kapoor, chx, alexpott, tim.plunkett, Mile23, daffie: Deprecate debug(); remove references to _drupal_debug_message()

Issue #2949419 by mfb, vsujeetkumar, gapple, Hardik_Patel_12, neclimdul, dawehner, Sam152, xjm, alexpott: Pass the raw exception to logger implementations

Issue #2807743 by alexpott, catch, kiamlaluno, neclimdul, xjm: Switch from deprecation notice to warning for non-standard placeholders in FormattableMarkup::placeholderFormat()

Issue #3074585 by mikelutz, alexpott, Berdir, Mile23, heddn, effulgentsia, Wim Leers: [Symfony 5] Replace app.root and site.path string services with container parameters

Issue #2979317 by tstoeckler, hchonov, alexpott: Duplicate deprecation header messages break Chromedriver

Issue #2927012 by deviantintegral, alexpott, arunkumark: _drupal_log_error() returns a 0 exit code on errors

Issue #2935254 by kim.pepper: Remove all usages of drupal_get_message and drupal_set_message in core includes

Issue #2870194 by alexpott, Mile23, jibran, larowlan, tim.plunkett: Ensure that process-isolated tests can use Symfony's PHPunit bridge to catch usages of deprecated code

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 #2638140 by alexpott, dawehner, cilefen, xjm, Fabianx, Xano, catch: Error logging should log a backtrace consistently

Issue #2572777 by andypost, alexpott, attiks, andriyun: Fix 'Squiz.Strings.ConcatenationSpacing' coding standard

Issue #2700661 by anoopjohn: Ensure core compliance to Drupal.Commenting.FunctionComment.ParamCommentIndentation (part 1).

Issue #2576533 by alexpott, stefan.r, Wim Leers, dawehner, xjm, effulgentsia, catch: Rename SafeStringInterface to MarkupInterface and move related classes

Issue #2562487 by stefan.r, chx, tim.plunkett, dawehner, alexpott: Get better error reporting from __toString

Issue #2501319 by joelpittet, cwells, stefan.r, YesCT, nlisgo, Cottser, cmanalansan, dawehner, xjm, alexpott, josephdpurcell: Remove SafeMarkup::set() in Error::renderExceptionSafe() and _drupal_log_error() and improve backtrace formatting consistency in _drupal_log_error(), Error::renderExceptionSafe(), and DefaultExceptionSubscriber::onHtml()

Issue #2547127 by dawehner, Wim Leers, legolasbo, davidhernandez, webchick: [regression] Empty messages container appearing when a Notice occurs

Issue #2540438 by znerol, timmillwood: Invalid format string when falling back to error_log in _drupal_log_error()

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

Issue #2407195 by Wim Leers, Fabianx, joelpittet, lauriii, Crell: Move attachment processing to services and per-type response subclasses

Issue #2478119 by znerol, andypost: Replace references to Session Manager with references to Session

Issue #1818692 by mbrett5062, lokapujya, David_Rothstein, blacklight4: Improve the maintenance page error message (rollback)

Issue #2451085 by dawehner, Arla: _drupal_log_error() passes NULL to ThemeManager::setActiveTheme(), violating its typehint

Issue #2317913 by jhedstrom: Early error handling can result in fatal error (Call to a member function get() on a non-object)