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Patrick Logan
"Do we need contracts?" Always. The misunderstanding is in answering "what is a contract?" Design-time checked overspecifications are not the only form of contract. For example, the HTTP spec is a contract. The Atom Protocol spec is a contract that builds on that. If I were to build an order management system on top of the APP, I could give you a specification that builds on APP. As you noted, an "SDK" or even just "a set of tests" is often a sufficient executable format for those contracts. Given my order management spec and a reasonable set of tests that excercise it, developers should not have any trouble using that order management system.

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