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Slide 16 text
irb(main):001:0> Rails.application.class.ancestors
[MyApp::Application,
Rails::Application,
Rails::Engine,
Rails::Railtie,
Rails::Initializable,
ActiveSupport::ToJsonWithActiveSupportEncoder,
Object,
PP::ObjectMixin,
ActiveSupport::Dependencies::Loadable,
JSON::Ext::Generator::GeneratorMethods::Object,
ActiveSupport::Tryable,
Kernel,
BasicObject]