namespace System.Numerics
{
    public interface IBinaryInteger<TSelf> : IComparable, IComparable<TSelf>, IEquatable<TSelf>, IFormattable, IParsable<TSelf>, ISpanFormattable, ISpanParsable<TSelf>, IAdditionOperators<TSelf, TSelf, TSelf>, IAdditiveIdentity<TSelf, TSelf>, IBinaryNumber<TSelf>, IBitwiseOperators<TSelf, TSelf, TSelf>, IComparisonOperators<TSelf, TSelf, bool>, IDecrementOperators<TSelf>, IDivisionOperators<TSelf, TSelf, TSelf>, IEqualityOperators<TSelf, TSelf, bool>, IIncrementOperators<TSelf>, IModulusOperators<TSelf, TSelf, TSelf>, IMultiplicativeIdentity<TSelf, TSelf>, IMultiplyOperators<TSelf, TSelf, TSelf>, INumber<TSelf>, INumberBase<TSelf>, IShiftOperators<TSelf, int, TSelf>, ISubtractionOperators<TSelf, TSelf, TSelf>, IUnaryNegationOperators<TSelf, TSelf>, IUnaryPlusOperators<TSelf, TSelf>
        where TSelf, IBinaryInteger<TSelf>?
    {
        virtual int WriteLittleEndian(byte[]! destination, int startIndex);
    }
}