Stating the obvious
summary
Claim: making most entities conform to small protocols yields big wins — using Hashable and Identifiable unlocks standard-library features and mixin-style behavior. Tools shown: Swift protocols, protocol extensions, key-path grouping and collection extensions. Concrete builds: Book conforming to Identifiable and an extension that groups books by id or author; a collection extension to sort by distance for a Locatable protocol. All examples compile conceptually and demonstrate real, reusable utilities.
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