Representables in Swift
summary
Proposes a concrete pattern: keep a concrete Response internally for access control and expose a protocol with a single function that builds that backing model, making the backing type conform to its representable. Uses Swift protocols, file/module access control, and optional throwing initialization. Changing the API is a one‑line conversion of representable to backing model on entry, it centralizes conversion, avoids a breaking change, and prevents external improper mutation while keeping consumer flexibility.
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