Issue #2392427 by Arla: Too strict schema for system.mail:interface
Issue #2199795 by andypost, twistor, martin107, larowlan, andyceo: Make the Settings class prevent serialization of actual settings
Issue #2344967 followup by Gábor Hojtsy, Sutharsan: Tests for localization update does not update configuration translations
Issue #2395515 by alexpott, Berdir: Config static cache is not cleared properly on delete
Issue #2395511 by alexpott, Gábor Hojtsy: Config static cache is not cleared properly on rename
Issue #2157777 by damiankloip, dawehner: Views results cache has full entities in it
Issue #2394041 by Gábor Hojtsy: Row language settings from entity views should be on display level for all views
Issue #2233883 by benjy, hussainweb, ultimike: Link migration needs to convert source url into the appropriate route format for storage
Issue #2349991 by fago, Xano, amateescu: Provide a trait for categorizing plugin managers and use it for conditions and actions
Issue #2387965 by hussainweb, tadityar: Clean-up telephone module test members - ensure property definition and use of camelCase naming convention
Issue #2359457 by JeroenT: Remove drupal_mail()
Issue #2391403 by Gábor Hojtsy: Statistics block not properly migrated, schema incorrect
Issue #2392429 by fago: ModuleHandlerInterface::getName() parameter name does not match its documentation
Issue #2380023 by tibbsa, subhojit777, rpayanm: Clean-up Comment module Test members - ensure property definition and use of camelCase naming convention
Issue #2213941 by sun, swentel: install_no_profile_error() called but does not exist
Issue #2258335 by rpayanm, ParisLiakos, mitrpaka: Move Drupal\Tests\Component\Image\ImageUtilityTest to Drupal\Tests\Component\Utility\ImageTest
Issue #2217731 by crowdcg, lauriii, davidhernandez, aczietlow, jjcarrion, mortendk, karolus, pakmanlh, LewisNyman, aboros, joshua.boltz: Move field classes out of preprocess and into templates
Issue #2254319 by quicksketch, jhedstrom: jQuery UI Spinner CSS file not added in system_library_info()
Issue #2280485 by SiliconMind, the_contributor: Documentation for file_save_upload() is wrong
Issue #2382799 by rpayanm: Remove drupal_html_class() and drupal_clean_css_identifier()