public class Benchmarks
{
    [Params(1024)]
    public int BitLength;

    [Params(true, false)]
    public bool IsBigEndian;

    [Params(true)]
    public bool IsPositive;

    private BigInteger n;

    [GlobalSetup]
    public void Setup()
    {
        Random r = new(123);
        byte[] bytes = new byte[BitLength / 8];
        r.NextBytes(bytes);
        if (IsPositive)
        {
            bytes[^1] &= 0x7F;
        }
        else
        {
            bytes[^1] |= 0x80;
        }
        n = new BigInteger(bytes);
    }

    [Benchmark] public byte[] ToByteArray() => n.ToByteArray(isBigEndian: IsBigEndian);
}