// PROJECT-EXAMPLE
var counts = new int[] { 2, 3 };
string json = System.Text.Json.JsonSerializer.Serialize(counts);
System.Console.WriteLine(json);

using System.IO;
using System.Text;
string file = Path.Combine(Path.GetTempPath(), Guid.NewGuid() + ".txt");
try
{
    await File.WriteAllTextAsync(file, "C# text", Encoding.UTF8, Cancellation);
    string text = await File.ReadAllTextAsync(file, Encoding.UTF8, Cancellation);
    UO.Print(text);
}
finally
{
    if (File.Exists(file)) File.Delete(file);
}

record Settings(int Delay, string Mode);
var settings = new Settings(100, "idle");
string json = System.Text.Json.JsonSerializer.Serialize(settings);
Settings? restored = System.Text.Json.JsonSerializer.Deserialize<Settings>(json);
UO.Print(restored?.Mode ?? "missing");