func (x xlMetaV2) listFreeVersions(volume, path string) ([]FileInfo, error) {
	fivs, err := x.ListVersions(volume, path, true)
	if err != nil {
		return nil, err
	}
	n := 0
	for _, fiv := range fivs {
		if fiv.TierFreeVersion() {
			fivs[n] = fiv
			n++
		}
	}
	fivs = fivs[:n]
	return fivs, nil
}

func TestFreeVersion(t *testing.T) {
	fatalErr := func(err error) {
		t.Helper()
		if err != nil {
			t.Fatal(err)

	// such that finally fivs.Versions has
	// all the non-free versions and fivs.FreeVersions has all the free
	// versions.
	n := 0
	for _, fi := range fivs.Versions {
		// filter our tier object delete marker
		if fi.TierFreeVersion() {
			if !inclFreeVersions {
				fivs.FreeVersions = append(fivs.FreeVersions, fi)
			}
		} else {
			if !inclFreeVersions {
				fivs.Versions[n] = fi
			}
			n++
		}
	}
	if !inclFreeVersions {