By wim leers on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.0.x
Introduced in version: 
8.0-BETA8
Issue links: 
https://www.drupal.org/node/2433599
Description: 

All usages of '#theme' => 'pager' must be converted to '#type' => 'pager'.

This ensures that each rendered pager automatically gets the appropriate cache context, which is important for (render) caching & performance.

Impacts: 
Module developers