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Many large software systems originate from untyped scripting language code. While good for initial development, the lack of static type annotations can impact code-quality and performance in the long run. We present an approach for integrating untyped code and typed code in the same system to allow an initial prototype to smoothly evolve into an efficient and robust program. We introduce like types, a novel intermediate point between dynamic and static typing. Occurrences of like typesdoi:10.1145/1706299.1706343 dblp:conf/popl/WrigstadNLOV10 fatcat:dlezdwqoyvgyvcx2ek4xk6bpjq