Discussion between Jo King and guest271314

The problem with the requirements is that they are pretty much impossible, since there are almost no languages that can represent -0.0 differently from 0

Posting an answer stating the requirement is not possible is not standard behaviour on this site and the answer would be deleted by mods. That stuff is usually addressed in the comments

Usually, disallowing built in functions will create more confusion than it helps to make the challenge more interesting.

@guest271314 Actually, in Javascript, using strings would be the fastest and simplest way.