Issue #1956698 by Gábor Hojtsy, xjm, alexpott, damiankloip, mgifford: Prevent access to YAML files using .htaccess and web.config.

Issue #2349651 by larowlan, yannisc: Fixed Default contact form does not send email as email recipient is not set during the installation.

Issue #2316561 by jmolivas | YesCT: Type hint hooks with interface: ConfigurableLanguageInterface instead of LanguageEntity/ConfigurableLanguage.

Issue #2359449 by Jose Reyero: Fixed TypedData calls onChange() parent's method that is not part of the interface.

Issue #2278583 by nlisgo, Berdir, joshi.rohit100 | Fabianx: Fixed field_has_data looks at current data instead of revisioning data: this can lead to data loss.

Issue #2362123 by Wim Leers: Drupal_page_header() and drupal_send_headers() are dead code: already deprecated, zero uses remain: remove.

Issue #1419298 by ryanissamson, zaporylie, ohthehugemanatee, ramlev, droplet, Albert Volkman, NROTC_Webmaster, pmitchell, pillarsdotnet: Remove all trailing whitespace from Drupal core files.

Issue #2288793 by YesCT, jamesdixon, xq1003, fran seva, Les Lim: Add missing and fix some types in core docblocks and add some typehinting for locale module.

Issue #1813488 by babruix, Ivan Zugec, quietone, ngwebs, legolasbo | amontero: Add descriptions to clarify "administer users" and "administer user settings" permissions.

Issue #2065485 by tim.plunkett, Xano: Document that PluginFormInterface should use #process to solve nesting issues.

Issue #2329763 by lauriii, Jens-0, Cottser, Sutharsan: Move links classes from preprocess to templates.

Issue #2329767 by lauriii, alexpott, Cottser, sqndr: Move table classes from preprocess to templates.

Issue #2358333 by mikey_p: Fixed ConfigManager should use interface for translation manager type hint.

Issue #2359005 by alexpott: Fixed LocalTaskManagerTest only works because we mock a non existing method.

Issue #2226533 by martin107, filijonka, YesCT, Xano, jmolivas, Chris Dart, alexpott, tstoeckler, visabhishek | csg: Changes to the Language class due to the LanguageInterface (followup).

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

Issue #1856262 by chx, pwolanin: Raise MySQL requirement to 5.1.21 to support caching of prepared statements.

Issue #2267551 follow-up by jfhovinne: [meta] Deal with PHP requirement vs. Debian PHP version numbering.

Issue #1623574 by droplet, cilefen, cesarmiquel, patrickfgoddard, sun, zaporylie, er.pushpinderrana, stevecowie, mbroere: Fixed Remove trailing space from form element labels and field labels (HTML nbsp).

Issue #2359035 by metzlerd: Add info to Routing topic about magic placeholder transformation to parameters in method