[mono] Function pointer type equality and type compatibility are not properly handled #90308

using System;
using System.Reflection;
using System.Runtime.CompilerServices;

namespace HelloWorld
{
    internal unsafe class Program
    {
        private const BindingFlags Bindings = BindingFlags.Public | BindingFlags.Static | BindingFlags.DeclaredOnly;
        
        public static delegate* unmanaged[Cdecl]<int> fptr1;
        public static delegate* unmanaged[Stdcall]<int> fptr2;
        private static void Main(string[] args)
        {
            FieldInfo fi1 = typeof(Program).GetField(nameof(Program.fptr1), Bindings);
            Type ft1 = fi1.FieldType;

            FieldInfo fi2 = typeof(Program).GetField(nameof(Program.fptr2), Bindings);
            Type ft2 = fi2.FieldType;

            if (ft1 == ft2)
                Console.WriteLine("Function pointer types are equal");
            else
                Console.WriteLine("Function pointer types are not equal");

            object arrayOfFptrs1 = new delegate*<int>[1];
            if (arrayOfFptrs1 is delegate*<int>[])
                Console.WriteLine("Is type compatible");
            else
                Console.WriteLine("Is not type compatible");

            object arrayOfFptrs2 = new delegate*<ref int, void>[1];
            if (arrayOfFptrs2 is delegate*<out int, void>[])
                Console.WriteLine("Is type compatible");
            else
                Console.WriteLine("Is not type compatible");
        }
    }
}