rails/rails — pull request #11210 by khoan (2013-07-01 09:00:36+00:00)
Title: enable memcached session store support for domain: :all config credit go...

```ruby
# All credit to https://github.com/rails/rails/pull/6084

# config/application.rb

# bundler and require stuff
module MyApp
class Application < Rails::Application
# config stuff

# enable magic domain: :all support
config.session_store :mem_cache_store, domain: :all
end
end
```

Could core team help to put in a test case for this.