Issue #2226437 followup by tstoeckler: [wrong patch committed] Create ContentEntityTypeInterface.
Issue #2218655 by sun, effulgentsia, jessebeach: Core expects $theme.settings default config file to exist.
Issue #2226241 by voidberg, claudiu.cristea: Saving image field or instance with an inexistent default_image crashes.
Issue #2233929 by alexpott, Berdir: drupal_set_time_limit() should only be able to increase the time limit.
Issue #2235347 by tim.plunkett: Field instance operations are out of order.
Issue #2178643 by ianthomas_uk, jhodgdon, jayeshanandani: Indexing status can show a negative percentage of content as having been indexed.