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 #2232477 by plach, yched, tstoeckler, amateescu: Fatal when adding new fields with NOT NULL constraints in a base table that contains existing entities

Issue #2320157 by moshe weitzman, Wim Leers, penyaskito, tim.plunkett: Generate placeholder content for Field types.

Issue #2226197 by fago, jessebeach: Introduce FieldStorageDefinitionInterface in the Entity Field API.

Issue #2192259 by andypost, amateescu, damiankloip: Remove ConfigField.. Item and List classes + interfaces.

Issue #2002134 by fago, yched, amateescu, effulgentsia: Move TypedData metadata introspection from data objects to definition objects.

Issue #2132145 by plopesc, amateescu, Xano: Rename 'typed_data' / Drupal::typedData() to 'typed_data_manager' / Drupal::typedDataManager.

Issue #2058257 by effulgentsia: Fix ConfigFieldItemInterface's method signatures to typehint interfaces instead of classes.