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summary
Claims that adopting a few concrete typing patterns improves Ruby code: use Hash#fetch to fail early instead of letting nil blow up, coerce inputs to Hash with to_h to get consistent errors, and wrap operations in a dry‑monads Result/Success/Failure chain with bind so failures short‑circuit predictably. Examples show clearer runtime errors, composition of sequential operations without nested rescues, and viable modeling of state machines and async flows; the changes keep idiomatic Ruby and demonstrably work in real code.
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