Issue #2457405 by stefan.r, andypost: DateTimePlus violates substitution principle of DateTime. Make it support PHP 7

Issue #1897058 by disasm, rteijeiro: Replace "boolean" with "bool" when used as param/return/var type

Issue #2454733 followup by amateescu: Add a user-space case-insensitive collation to the SQLite driver

Issue #2457781 by prateekMehta, stefan.r, AjitS, hussainweb: Use Utility\Html class instead of Utility\String for decodeEntities() function

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

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

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

Issue #2455083 by dawehner, larowlan, klausi, David_Rothstein, hefox, tsphethean, dstol, DamienMcKenna, Pere Orga, benjy: Open redirect fixes from SA-CORE-2015-001 need to be ported to Drupal 8

Issue #2273923 by mpdonadio, pfrenssen, effulgentsia, pcambra, xjm, tim.plunkett, martin107, cilefen: Remove html => TRUE option from l() and link generator

Issue #2431379 by tim.plunkett, Upchuk, dawehner: LazyPluginCollection should not implement \Iterator

Issue #2443409 by Berdir: Add a way to entity manager to get fresh entity and field definitions without invalidating all caches

Issue #2435493 by effulgentsia: Change String::format()'s '@' and '%' placeholders to be auto-escaped rather than always-escaped

Issue #2417793 by effulgentsia, Wim Leers, YesCT, yched, dawehner: Allow entity: URIs to be entered in link fields

Issue #2364157 by mpdonadio, dawehner, martin107, Berdir, pcambra, naveenvalecha, tim.plunkett: Replace most existing _url calls with Url objects

Issue #2408533 by markpavlitski: Installation Fatal error: Call to undefined function opcache_invalidate()

Issue #2399037 by effulgentsia: String::format() marks a resulting string as safe even when passed an unsafe passthrough argument

Issue #1973618 by dawehner, donquixote, plach, Mile23: DIC: Lazy instantiation of service dependencies (ProxyManager for "proxy services")

Issue #2349991 by fago, Xano, amateescu: Provide a trait for categorizing plugin managers and use it for conditions and actions

Issue #2378585 by EclipseGc, tim.plunkett: Multiple context requirements cannot be satisfied by a single value

Issue #2339151 by EclipseGc, tim.plunkett, Gábor Hojtsy, effulgentsia: Conditions / context system does not allow for multiple configurable contexts, eg. language types

Issue #2303777 by sun, jhedstrom: Fixed Allow drupal components to depend on other components outside Drupal.

Issue #2282673 by stevepurkiss, ParisLiakos, mgifford: Add a PHPunit test for not using Drupal\Core code in Drupal\Component.

Issue #2271419 by alexpott, larowlan: Fixed Allow field types, widgets, formatters to specify config dependencies.

Issue #2324371 by lauriii, aneek, chx, joelpittet, webflo, Fabianx, rteijeiro: Fix common HTML escaped render #key values due to Twig autoescape.

Issue #2282519 by alexpott, cilefen: Fixed Add content dependency information to configuration entities.

Issue #1825466 by justafish, tstoeckler, alexpott, sun: [docs follow-up, then backport to D7] Allow NestedArray::mergeDeepArray() to preserve integer keys.

Issue #2246647 by mpdonadio, cilefen, YesCT, tim.plunkett: Rename PluginBag to LazyPluginCollection.