F# 4.1 VS 2017 15.4 System.Tuple fallout

Library1.fs

namespace MyNamespace

module Update =

    open System
    open System.IO

    type FileMapper = Func<string, Tuple<bool, Stream>>

    type UpdateArguments = {
        MapFilePath : FileMapper
    }

    [<CompiledName("F")>]
    let f (args : UpdateArguments) =

        let success, file =     let result = args.MapFilePath.Invoke("name")
                                result.Item1, result.Item2
        printfn "%A %A" success file.CanRead

Library1.fsi

namespace MyNamespace

module Update =

    open System
    open System.IO

    type FileMapper = Func<string, Tuple<bool, Stream>>

    type UpdateArguments = {
        MapFilePath : FileMapper
    }

    val f : UpdateArguments -> unit

Program.cs

using System;
using System.IO;
using MyNamespace;

namespace ReproTuple2
{
    class Program
    {
        static void Main(string[] args)
        {
            Func<string, Tuple<bool, Stream>> callback = name => Tuple.Create(true, (Stream)new MemoryStream());

            Update.F(new Update.UpdateArguments(callback));
        }
    }
}