The automatic conversion not only confuses people but also makes the method less extensible. See [Feature #14183] for more details about the reasons for the change in behavior, and why certain implementation choices were made.

To understand this helper, you should understand that every step invocation calls Output() for you behind the scenes. The following DSL use is identical to the one [above]. class Execute < Trailblazer::Activity::Railway step :find_provider, Output(Trailblazer::Activity::Left, :failure) => Track(:failure), Output(Trailblazer::Activity::Right, :success) => Track(:success)