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 #2489606 by 20th, slashrsm: hook_file_download() docblock refers to a non-existing function file_download()

Issue #2818031 by phenaproxima, Berdir, alexpott: Trailing slashes can cause FileSystem::mkdir() to return a false negative

Issue #2796329 by Wim Leers: \Drupal\Core\File\MimeType\ExtensionMimeTypeGuesser maps the 'js' extension to the 'application/x-javascript' MIME type instead of 'application/javascript'

Issue #2572801 by alexpott, vprocessor, andriyun, andypost, chishah92, Mile23, attiks, hussainweb, klausi, dawehner, pfrenssen: Fix 'Drupal.WhiteSpace.ScopeIndent' coding standard

Issue #2783849 by Shashwat Purav, kiamlaluno: hook_filetransfer_info() documentation has not been updated for Drupal 8

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

Issue #2526412 by neclimdul, hussainweb, Fabianx: Remove Singleton hack in registerWithSymfonyGuesser

Issue #2392559 by mondrake, mitrpaka, JeroenT, rpayanm, adci_contributor, ianthomas_uk: Remove all uses of file_stream_wrapper_get_* and file_get_stream_wrappers

Issue #2408371 by dawehner, Fabianx, alexpott, bforchhammer: Proxies of module interfaces don't work

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

Issue #2401843 by lahoosascoots, jhodgdon: Move all *.api.php files except system.api.php out of system module directory

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2050759 by tim.plunkett, fietserwin: Move drupal_chmod and other code in file.inc to a Drupal\Core\File\FileSystem class

Revert "Issue #2388749 by alexpott, adci_contributor, ParisLiakos: Register symfony's mime guessers if they are supported"

This reverts commit 4dae1d99.

Issue #2388749 by alexpott, adci_contributor, ParisLiakos: Register symfony's mime guessers if they are supported

Issue #2387443 by alexpott, dawehner: BinaryFileResponse can fail because the core MIME guessing is not added to the MimeType singleton

Issue #1921558 by ParisLiakos, xjm, Dave Reid: Convert file_get_mimetype() to use Symfony MimeTypeGuessers.

Issue #1468328 by Berdir: Move file entity info, managed file, and file usage functionality into File module.

Issue #1668820 by sun, xjm, tim.plunkett, fgm: Concept, base class, and interface for configurable objects.

Issue #1615236 by Berdir, aspilicious: Merge entity controller interfaces, document and add default entity class definition.