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+*   Add `:only` option to `assert_enqueued_jobs`, to check the number of times
+    a specific kind of job is enqueued.
+
+    Example:
+
+        def test_logging_job
+          assert_enqueued_jobs 1, only: LoggingJob do
+            LoggingJob.perform_later
+            HelloJob.perform_later('jeremy')
+          end
+        end
+
+    *George Claghorn*
+
+*   `ActiveJob::Base.deserialize` delegates to the job class.
+
+    Since `ActiveJob::Base#deserialize` can be overridden by subclasses (like
+    `ActiveJob::Base#serialize`) this allows jobs to attach arbitrary metadata
+    when they get serialized and read it back when they get performed.
+
+    Example:
+
+        class DeliverWebhookJob < ActiveJob::Base
+          def serialize
+            super.merge('attempt_number' => (@attempt_number || 0) + 1)
+          end
+
+          def deserialize(job_data)
+            super
+            @attempt_number = job_data['attempt_number']
+          end
+
+          rescue_from(TimeoutError) do |exception|
+            raise exception if @attempt_number > 5
+            retry_job(wait: 10)
+          end
+        end
+
+    *Isaac Seymour*
+
+
+Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/activejob/CHANGELOG.md) for previous changes.