use Test::More tests => 23;
is(id2path_new($_), id2path($_), "id=$_") for q(), 0, 1, 9, 10, 99,
                                          100, 999, 1000, 9999, 10000,
                                          99999, 100000, 999999, 1e6,
                                          1e7-1, 1e7, 1e8-1, 1e8, 1e9,
                                          1e10, 1e11, 1e12;