Issue #2880480 by er.pushpinderrana, joachim: ObjectWithPluginCollectionInterface::getPluginCollections() shouldn't mention entities
Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits
Issue #2658628 by tim.plunkett: \Drupal\Core\Entity\EntityWithPluginCollectionInterface has no reason to be entity specific
Issue #2246647 by mpdonadio, cilefen, YesCT, tim.plunkett: Rename PluginBag to LazyPluginCollection.