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The size of an object is not necessarily the same as the size of the type of an object. This is because by default object sizes are increased to be a multiple of the alignment of the object. For example, Natural'Size is 31, but by default objects of type Natural will have a size of 32 bits. Similarly, a record containing an integer and a character:

     type Rec is record
        I : Integer;
        C : Character;
     end record;

will have a size of 40 (that is Rec'Size will be 40). The alignment will be 4, because of the integer field, and so the default size of record objects for this type will be 64 (8 bytes).