Issue #2169361 by plopesc: Convert COMMENT_HIDDEN & COMMENT_CLOSED & COMMENT_OPEN  to a constant on the comment field interface.

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

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

Issue #2141929 by andypost, clemens.tolboom, mgifford: Comment link or form is added to print view mode.

Issue #2152825 by plopesc, swentel, Berdir: Rename FieldItemBase::getFieldSetting[s]() to getSetting[s]().

Issue #2164827 by Berdir, Xano, tim.plunkett: Rename the entityInfo() and entityType() methods on EntityInterface and EntityStorageControllerInterface.

Issue #2155387 by larowlan: Multiple comment fields per entity are supported, but break horribly when they need pagers.

Issue #2099133 by Wim Leers  Comment form on same page as comments forces node render caching to be per user.

Issue #2136895 by Wim Leers: Comment settings are now a field, but not an editable one: breaks in-place editing .

Issue #2099133 by Wim Leers: Comment form on same page as comments forces node render caching to be per user.

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