Authored by Mark Seemann, a software architect and consultant, this blog focuses on software design, object-oriented programming, and functional programming principles. Readers can explore articles and discussions on topics such as dependency injection, domain-driven design, and test-driven development. Additionally, they can learn about architectural patterns, design patterns, and best practices for building robust, maintainable software systems.

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The article discusses the concept of conservative codomain conjecture in API design and explores the implications of being liberal in what one accepts and conservative in what one sends. It focuses on the 'Average' method as an example and provides insights into modelling contracts, error-handling, and the choice between liberal and conservative approaches. The article concludes that it is generally better to choose the design with a conservative codomain to ensure robustness and extensibility.

Conservative codomain conjecture