There is a popular principle: “Favor object composition over class inheritance” (where composition is effectively the same as delegation). Many people take this to mean “inheritance considered harmful” and claim that we should never use inheritance. I use inheritance frequently, partly because I always know I can use Replace Subclass with Delegate should I need to change it later. Inheritance is a valuable mechanism that does the job most of the time without problems. So I reach for it first, and move onto delegation when it starts to rub badly. This usage is actually consistent with the
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