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Published online by Cambridge University Press: 12 June 2025
Many type systems include the concept of subtyping, allowing a value of one type (the subtype) to be used as if it is a value of another type (the supertype). The aim is to allow greater flexibility in programming, while maintaining safety. In this chapter, we see how subtyping can be included in our system of session types. We build on the language in Chapter 4, using replicated input, rather than recursive process definitions, to express repetitive behaviour.
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