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Software Engineering

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    yes but there is also the expression problem eli.thegreenplace.net/2016/… Commented Jun 16, 2020 at 15:12
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    Note that making your programs completely pure OOP may be not ideal itself. Often a mixture of paradigms is better, as some problems are easier solved with other approaches. So even if type testing is bad OOP, it could be good in a particular place. Commented Jun 22, 2020 at 8:53