Unboxing enums to underlying type

[miloush]

The same problem MF has:

Desktop CLR allows to unbox an enum into its underlying type and vice versa.

enum TestEnum { A }

static void Main(string[] args)
{
    TestEnum test = TestEnum.A;
    object obj = test;
    int value = (int)obj;
    // back
    obj = value;
    test = (TestEnum)obj;
}

This has been explicitly allowed by CLI specification up to the 3rd edition. Further discussion and less desired consequences at http://codeblog.jonskeet.uk/?p=91.

I do not feel strongly about allowing this (unlike in MF where I had a use case with resource enums), and I don't know if CoreCLR allows it, but it is a potential code compatibility issue to consider in the future.