FasterKv MaxRdSecond set 0 or -1 not come into effect

IServiceCollection services = new ServiceCollection();

services.AddEasyCaching(option =>
{
//use fasterkv cache
option.UseFasterKv(config =>
{
config.EnableLogging = true;
config.MaxRdSecond = -1;
}, "testcaching").WithMessagePack("testcaching");
});

IServiceProvider serviceProvider = services.BuildServiceProvider();

var factory = serviceProvider.GetService();

var caching = factory.GetCachingProvider("testcaching");

caching.TrySet("testcaching", $"testcachingmsg", TimeSpan.FromSeconds(1));

var msg = caching.Get("testcaching");

Debug.WriteLine($"caching msg->{msg}");

Thread.Sleep(3000);

var msg2 = caching.Get("testcaching", () => "12345", TimeSpan.FromSeconds(1));

Debug.WriteLine($"caching msg2->{msg2}");

print is

11:57:26:112 caching msg->testcachingmsg
11:57:29:114 caching msg2->testcachingmsg

I see issues setting MaxRdSecond to 0 or -1 has no effect

There is no such case. Why? In addition, the documentation of UseFasterKv is too few. I can only know from the preferred documentation that it is similar to the combination of UseInMemory and UseDisk. I don't know if this is the right understanding, there is so little documentation