Asumu Takikawa, Daniel Feltey, Earl Dean, M. Flatt, R. Findler, Sam Tobin-Hochstadt, M. Felleisen
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Over the past 20 years, programmers have embraced dynamically-typed programming languages. By now, they have also come to realize that programs in these languages lack reliable type information for software engineering purposes. Gradual typing addresses this problem; it empowers programmers to annotate an existing system with sound type information on a piecemeal basis. This paper presents an implementation of a gradual type system for a full-featured class-based language as well as a novel performance evaluation framework for gradual typing.