In the world of object-oriented programming, few concepts are as misunderstood as the Liskov Substitution Principle (LSP). However, prior to LSP, early Pascal developers used a more rigid—yet in some cases, “indiscriminately better”—approach to subtype polymorphism. This article explores Pascal’s historical substitution rules, why they failed in complex hierarchies, and how modern languages achieve “sweet” (elegant) and safe substitutions.
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