Pull in Sidekiq::Job by default

Changes.md

@@ -5,6 +5,16 @@
 HEAD
 ---------
 
+- **FEATURE**: Add `Sidekiq::Job` alias for `Sidekiq::Worker`, to better
+  reflect industry standard terminology. You can now do this:
+```ruby
+class MyJob
+  include Sidekiq::Job
+  sidekiq_options ...
+  def perform(args)
+  end
+end
+```
 - **FEATURE**: Support for serializing ActiveSupport::CurrentAttributes into each job. [#4982]
 ```ruby
 # config/initializers/sidekiq.rb

lib/sidekiq.rb

@@ -6,6 +6,7 @@ fail "Sidekiq #{Sidekiq::VERSION} does not support Ruby versions below 2.5.0." i
 require "sidekiq/logger"
 require "sidekiq/client"
 require "sidekiq/worker"
+require "sidekiq/job"
 require "sidekiq/redis_connection"
 require "sidekiq/delay"
 

lib/sidekiq/job.rb

@@ -1,8 +1,13 @@
 require "sidekiq/worker"
 
 module Sidekiq
-  # Sidekiq::Job is a new alias for Sidekiq::Worker, coming in 6.3.0.
-  # You can opt into this by requiring 'sidekiq/job' in your initializer
-  # and then using `include Sidekiq::Job` rather than `Sidekiq::Worker`.
+  # Sidekiq::Job is a new alias for Sidekiq::Worker as of Sidekiq 6.3.0.
+  # Use `include Sidekiq::Job` rather than `include Sidekiq::Worker`.
+  #
+  # The term "worker" is too generic and overly confusing, used in several
+  # different contexts meaning different things. Many people call a Sidekiq
+  # process a "worker". Some people call the thread that executes jobs a
+  # "worker". This change brings Sidekiq closer to ActiveJob where your job
+  # classes extend ApplicationJob.
   Job = Worker
 end