", false)  require.NoError(t, err)  require.Equal(t, expFoos, dgst)   dgst, err = cc.ChecksumWildcard(context.TODO(), ref, "x/d?", false)  require.NoError(t, err)  require.Equal(t, dgstDirD0, dgst)   dgst, err = cc.ChecksumWildcard(context.TODO(), ref, "x/d?