Issue #3266568 by mxr576, sourabhjain, quietone: Refactor array_merge() usage in loops as possible for performance

Issue #3164210 by jungle, sylus, Akhildev.cs, dww: Refactor array_merge() usage in loops as possible for performance

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

Issue #2600078 by YesCT, koppie, kgoel: Correct syntax for data type documentation in TranslationManager.php

Issue #2600396 by mpdonadio, justAChris, tstoeckler, skyredwang, jhodgdon, Gábor Hojtsy, Matze202: DateFormatter::formatDiff passes an invalid language code TranslationInterface::formatPlural() leading to duplicated translations and untranslatable strings

Issue #2578377 by YesCT, jhodgdon, Gábor Hojtsy, alexpott, herom, xjm: Make translatable docs consolidated and better for developers

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

Issue #2571695 by dawehner, plach, stefan.r, jaredsmith, lauriii, YesCT, xjm, catch, alexpott, joelpittet, Ryan Weal, Sutharsan, subhojit777, justAChris, nlisgo, effulgentsia, rpayanm, larowlan, chx, geertvd: Remove !placeholder and unsafe string return from SafeMarkup::format()

Issue #2571375 by alexpott, webflo, stefan.r, Xano, mr.baileys: Remove TranslationManager dependency from LanguageManager

Issue #2570107 by alexpott: Make format_plural() return a PluralTranslatableString object to remove reliance on a static, unpredictable safe list

Issue #2569069 by stefan.r, mr.baileys, alexpott, lauriii: Replace TranslationWrapper with TranslatableString and deprecate TranslationWrapper

Issue #2557113 by stefan.r, alexpott, dawehner, joelpittet, cilefen, lauriii, plach, catch, chx, xjm: Make t() return a TranslationWrapper object to remove reliance on a static, unpredictable safe list

Issue #2488304 by genjohnson, lauriii, YesCT, Mariano, Gábor Hojtsy, jhodgdon, xjm: Add more docs that translate() also marks strings as safe

Issue #2453761 by Gábor Hojtsy: Views numeric formatter's plural formatting setting incompatible with many languages

Issue #2454859 by Gábor Hojtsy, alexpott, mrjmd: Not possible to format plural an already translated string

Issue #2454447 by andypost, dawehner, rteijeiro: Split Utility\String class to support PHP 7 (String is a reserved word)

Issue #2340667 by YesCT, Pedro Lozano, alexpott, martin107: Protect Drupal\Core\Language\Language::id, and use getId().

Issue #1825952 by Fabianx, joelpittet, bdragon, heddn, chx, xjm, pwolanin, mikey_p, ti2m, bfr, dags, cilefen, scor, mgifford: Turn on twig autoescape by default

Issue #2239425 by cs_shadow, Mixologic, JacobSanford | penyaskito: Invalid TranslatorInterface type hinting in LanguageRequestSubscriber.

Issue #1862202 by plach, Berdir, katbailey, ParisLiakos, alexpott, chx, sun, larowlan, Gábor Hojtsy, cosmicdreams, vijaycs85, YesCT, penyaskito, andypost, Albert Volkman, joelpitett: Objectify the language system.

Issue #2111349 by dawehner, tim.plunkett: Move format_plural to the string translation service and format_interval to the date service.

Issue #1754246 by webflo, swentel, penyaskito, andypost, alexpott, YesCT, dagmar: Languages should be configuration entities.

Issue #1813762 by ParisLiakos, Jose Reyero, YesCT, japicoder, attiks: Introduce unified interfaces, use dependency injection for interface translation.