1  => [ 1, 2 ]
2  => [ 2, 2 ]
3  => [ 3, 3 ]
0  => <nil>
0  => <nil>
0  => [ 0, 0 ]
1  => <nil>
998  => [ 998, 499 ]
999  => <nil>
10000  => <nil>
0  => [ 0, 0 ]
1  => <nil>
998  => [ 998, 499 ]
999  => <nil>
1023  => <nil>
1024  => [ 1024, 512 ]
10000  => <nil>