Benchmark of cast to IEnumerable<int> vs call of the extension method .AsEnumerable()

Program.cs

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;
using Cysharp.Text;

BenchmarkRunner.Run<CastVsAsEnumerable>();

[MemoryDiagnoser]
[SimpleJob(RuntimeMoniker.Net60)]
public class CastVsAsEnumerable
{
    private const string Separator = "_,_";
    private static readonly Random Random = new(60);

    [Params(0, 1, 100)]
    public ushort Size { get; set; }

    private readonly HashSet<int> _hashSet = new ();
    [GlobalSetup]
    public void GlobalSetup()
    {
        for (var i = 0; i < Size; i++)
            _hashSet.Add(Random.Next(int.MinValue, int.MaxValue));
    }
    [Benchmark]
    public string Cast()
    {
        return ZString.Join(Separator, (IEnumerable<int>)_hashSet);
    }

    [Benchmark]
    public string AsEnumerable()
    {
        return ZString.Join(Separator,_hashSet.AsEnumerable());
    }
}