计算列表中未更改的元素的数量，单位为F#

let rec countUnchangedElements (lst: 'a list) (defaultValue: 'a) =
    let rec loop count = function
        | [] -> count
        | x::xs when x = defaultValue -> loop (count + 1) xs
        | _::xs -> loop count xs
    loop 0 lst

let myList = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10]
let unchangedCount = countUnchangedElements myList 0
printfn "未更改的元素数量：%d" unchangedCount

未更改的元素数量：0