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 #2500525 by dawehner, catch, pjonckiere, mpdonadio, Wim Leers, jhodgdon: Time ago/hence date/time formatting breaks caching; needs appropriate max age or javascript