I found some weird behaviour when working with numbers in C# (.NET8 version 8.0.400).

I created a custom type to wrap numbers, this is the minimalized code to showcase the behavior:

struct Mystery<T>(T value)
    where T : IBinaryInteger<T>
{
    public T Value { get; } = value;

    public int GetByteCount() => Value.GetByteCount();
}

Execution code:

Mystery<BigInteger> mystery = new(short.MaxValue);

// Mystery<BigInteger> mystery = new(new BigInteger(short.MaxValue)); // same behavior

Console.WriteLine(mystery.GetByteCount()); // 4
Console.WriteLine(mystery.Value.GetByteCount()); // 2
Console.WriteLine(((IBinaryInteger<BigInteger>)mystery.Value).GetByteCount()); // 4

Output:

4
2
4

Since I created the Mystery type to wrap around the number, I would want mystery.GetByteCount() to behave exactly like Value.GetByteCount().
However, as seen in the output, my code is not working as intended.

Where did I go wrong?