params.cs

using System.IO;
using System;
using System.Collections.Generic;
using System.Linq;


class Program
{
    
    public static string  Foo<T>( params T[] items)
    {
        return "A";
    }
    
    public static string Foo<T>(IEnumerable<T> items)
    {
        return "B";
    }

    static void Main()
    {
        List<int> items = new List<int>(){0,1,23};
        
        Console.WriteLine(Foo(items));
        Console.WriteLine(Foo("XXX"));

    }
}

Running this outputs

A
A

rather than

B
A