Conversion of boxed value types

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Boxed value types can only be unboxed into their original Type, even if a conversion of the two Types is valid, e.g.:

object boxedInt = (int)1; // int boxed in an object

long unboxedInt1 = (long)boxedInt; // invalid cast

This can be avoided by first unboxing into the original Type, e.g.:

long unboxedInt2 = (long)(int)boxedInt; // valid

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