LINQy C# Fibonnaci

LinqyFibonnaci.cs

// Written as a reply to https://twitter.com/buhakmeh/status/1577738711013335040
// (C) 2022 I D Griffiths

// EnumerableEx from System.Interactive
IEnumerable<BigInteger> FibonnaciEndless() => EnumerableEx.Generate(
    (i: new BigInteger(0), n: new BigInteger(1)),
    _ => true,
    s => (s.n, s.i + s.n),
    s => s.i);

// Why num + 1? Because Khalid's example also returns 11 numbers when you ask it
// for 10.
IEnumerable<BigInteger> Fibonnaci(int num) => FibonnaciEndless().Take(num + 1);

// ...and if you really want a list
IEnumerable<BigInteger> FibonnaciLinqy(int num) => Fibonnaci(num).ToList();

foreach (BigInteger i in FibonnaciLinqy(10))
{
    Console.WriteLine(i);
}