Repository.Checkout() doesn't unstage submodule changes

If I have a repo in this status

On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

        modified:   App_Data/Submodule
        modified:   file.txt

with App_Data/Submodule being a git submodule and file.txt is just a normal file.

Running git checkout master --force will put the repo in this condition

On branch master
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

        modified:   App_Data/Submodule (new commits)

no changes added to commit (use "git add" and/or "git commit -a")

but doing the same from LibGit2Sharp using the following code

using (var repo = new LibGit2Sharp.Repository(RepositoryPath))
{
  repo.Checkout("master", new CheckoutOptions { CheckoutModifiers = CheckoutModifiers.Force });
}

leaves the repo in this state

On branch master
Changes to be committed:
  (use "git reset HEAD <file>..." to unstage)

        modified:   App_Data/Submodule

Calling reset however works as expected.

using (var repo = new LibGit2Sharp.Repository(RepositoryPath))
{
    repo.Reset(ResetMode.Hard, "master");
}

Is that behavior expected from LibGit2Sharp? Should I be calling Reset myself if I want to mirror exactly the same git behavior?

ref: http://stackoverflow.com/q/33030355/3234163

从 Repository.Checkout 开始，使用 CheckoutModifiers.Force 重现所示的已暂存子模块场景。将其结果与 git checkout master --force 以及现有的 Reset(ResetMode.Hard, "master") 行为进行比较；当 Checkout 与 Git 一致地取消暂存子模块更改，或将差异记录为预期行为时，即表示完成。