Queues were recently pulled from Rails 4: https://github.com/rails/rails/commit/f9da785d0b1b22317cfca25c15fb555e9016accb https://github.com/rails/rails/commit/f

Queues were recently pulled from Rails 4: https://github.com/rails/rails/commit/f9da785d0b1b22317cfca25c15fb555e9016accb https://github.com/rails/rails/commit/f9da785d0b1b22317cfca2...