params and IEnumerable<> overloads

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

static class Program
{
  static void X<T>(params T[] items) { Console.WriteLine("X<T>(params T[] items), T: {0}", typeof(T)); }
  static void X<T>(IEnumerable<T> items) { Console.WriteLine("X<T>(IEnumerable<T> items), T: {0}", typeof(T)); }

  static void Y(params object[] items) { Console.WriteLine("Y(params object[] items), T: {0}", items.First().GetType()); }
  static void Y(IEnumerable<object> items) { Console.WriteLine("Y(IEnumerable<object> items), T: {0}", items.First().GetType()); }

  static void Main() {
    var x = new List<int> { 1, 2, 3, };
    X(x);
    // X<T>(params T[] items), T: System.Collections.Generic.List`1[System.Int32]

    var y = new List<int> { 1, 2, 3, };
    Y(y);
    // Y(params object[] items), T: System.Collections.Generic.List`1[System.Int32]
  }
}