This is a carefully constructed (malformed) problem presented in an obfuscated way. It didn't "just happen" that those ~20 bit numbers happen to produce slopes that differ only after ~57 bits, come on. If you're going to do that kind of trickery, you can come up with an equivalent that blows up any fixed precision limit and/or explodes the representation size for any arbitrary precision computation system.

It's a parlor trick, not a serious problem.