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

Issue #3151364 by Charlie ChX Negyesi, amateescu, alexpott, jhodgdon: diacritics are not removed from ǢǣǼǽǮǯ

Issue #3001997 by Krzysztof Domański, scott_euser, alexpott: Transliteration a string containing an unknown character (e.g. 0x80) is not valid

Revert "Issue #3000630 by scott_euser, Krzysztof Domański, APolitsin, vijaycs85, longwave: Transliteration causes 2 capital letters at the beginning of a word"

This reverts commit bb7fb6a3.

Issue #3000630 by scott_euser, Krzysztof Domański, APolitsin, vijaycs85, longwave: Transliteration causes 2 capital letters at the beginning of a word

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 #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2572693 by Mile23, andriyun, andypost, attiks: Fix 'Drupal.ControlStructures.ControlSignature' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2700367 by alexpott: Consolidate miscellaneous docs from class @file docblocks into the class docblocks (part2)

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #731298 by pjonckiere, jhodgdon: Searches for words with diacritics/accents: word not highlighted in results

Issue #2079863 by filijonka, mrsinguyen, fabricebernhard, Chernous_dn, YesCT: Remove Unused local variable from /core/lib/Drupal/Component Utility/Crypt.php  Transliteration/PHPTransliteration.php  Utility/UserAgent.php  Gettext/PoHeader.php.