I like keywords i guess

keyword.cs

public class Why : Span<U>, IDisposable where U : struct
{
    const sbyte BECAUSE_YES = 2;
    public object Contents { get => (string)this; set { _ = value; } };
    public void Dispose() { throw new NotImplementedException(); }
    public static explicit operator string(Why y) { return "cause fuck you"; }
}

public async IAsyncEnumerable<T> OhGod<T>(T t) where T : Why
{
    Span<byte> foo = stackalloc byte[4];
    unsafe {
      switch ((string)t)
      {
          default:
          case "what":
              yield return await new Task(() => { do { lock ((object)t) { using (var stream = new Why()) { dynamic a = stream.Contents is int; } } } while (true || false); }) is Int64 ? t : default;
              break;
       }
    }
}