F# static variable,static constructor,destructor

gistfile1.fs

// TODO: Test2's destructor does not work
open System
open System.IO
open System.Net

type Test2() =
     // static variable
    [<DefaultValue>]
    static val mutable private i:int
    // static constructor
    static do
        Test2.i <- 4
        Console.WriteLine "inside static constructor.."
    // primary constructor
    do Console.WriteLine("inside regular constructor..i={0}",Test2.i);
    // it aimed to behave as destructor but didn't
    override x.Finalize() = Console.WriteLine "destructor(hopefully) called for each object"

Console.WriteLine "Test2"
new Test2() |> ignore
new Test2() |> ignore

Console.ReadKey() |> ignore