[dragonwriter]

> Debug? You don’t.

If by “debug” you mean “step through with a debugger” (at least Ruby’s standard debugger), sure (except at the steps with blocks, which you can easily insert as noops as needed with #tap). But, honestly, I almost never resort to using a debugger in practice, so minor variations in where breakpoints can be set aren’t something I see as a big deal.

> and almost always makes you “unroll” it into its boring, “classic” form.

No, it never makes you unroll it in Ruby.