Add twig:unused command. Move twig:compile (#3503)
Fix #3512. Add extra-dump option to sql:sync.
Fix namespace for global commandfiles. Now matches docs. (#3518)
Fix #3380. 'Container cannot be saved to cache' for updatedb commands.
Fix #3166. Fix incorrect script name when Drupal uses a domain + subdir. (#3553)
Update user-cancel test to match upstream DCG changes.
Authors of Drush9 global commands (i.e. commands that don't live within a module) will want to make sure they use the namespace Drush/Commands and not the briefer Drush.