Issue #2569897 by swentel, Les Lim, mbaynton, yched, xjm: Required Long Text With Summary + form rebuild = PHP fatal error

Issue #2136197 by andypost, jessebeach, swentel, longwave, Berdir: Move field/instance/widget/formatter settings out of annotation / plugin definition.

Issue #2203407 by nod_, sun: Replace #attached library array values with provider-namespaced strings.

Issue #2050835 by Berdir | yched: Move Widget, Formatter, and FieldType plugin types to the Core\Field system.

Issue #2051923 by Berdir, dixon_, plach: Rename \Drupal\Core\Entity\Field\Field, related subclasses and interfaces to *FieldItemList.

Issue #1758622 by klausi, fago, das-peter, Pancho, Berdir, yched: Provide the options list of an entity field.

Issue #2021817 by effulgentsia, yched: Make widgets / formatters work on EntityNG Field value objects.

Issue #1969728 by yched, effulgentsia, swentel, fago, plach: Implement Field API 'field types' as TypedData Plugins.

Issue #1950632 by effulgentsia, Wim Leers, amateescu, yched: Create a FieldDefinitionInterface, decoupled from  and  config entities, and use it for formatters and widgets.

Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.

Issue #1888744 by nick_schuch: Fixed text.module missing text_library_info() - does not explicitly declare js dependencies.

Issue #1241938 by swentel, Niklas Fiekas, yched: Added support for #placeholder to relevant Field API widgets.

Issue #1785256 by yched, Stalski, zuuperman, sun, tstoeckler, aspilicious, EclipseGc, larowlan: Widgets as Plugins.