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Foundation Kit
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===NSValue and NSNumber=== NSValue is a wrapper class for [[C variable types and declarations|C data types]], and NSNumber is a wrapper class for [[C (programming language)|C]] number data types such as '''int''', '''double''', and '''float'''. The [[data structure]]s in Foundation Kit can only hold objects, not primitive types, so wrappers such as NSValue and NSNumber are used in those data structures.
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