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This mechanism is not unique to object-oriented programming. Implementations of [[abstract data types]], e.g. [[module (programming)|modules]] offer a similar form of encapsulation. This similarity stems from the fact that both notions rely on the same mathematical fundament of an [[existential type]].<ref>Pierce (2002), Section 24.2 "Data Abstraction with Existentials"</ref>
== As bundling mechanism ==
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