Your code is passing the tests, right? I've got another one or two tests in my back pocket and will test all submissions with those two tests as well.
I'm not sure what you mean with 64 bytes precision but the problem states that the numerics can be almost unrestricted in length. So if you can only accomodate 64 consecutive integer characters then that might not be sufficient to pass all tests.
_________________________
There are two types of vessels, submarines and targets.
