MyBook/Library/PackageCache/com.unity.2d.path@5.0.2/Editor/Selection/IndexedSelection.cs

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;

namespace UnityEditor.U2D.Path
{
    [Serializable]
    internal class IndexedSelection : SerializableSelection<int>
    {
        protected override int GetInvalidElement() { return -1; }
    }
}