Right now, there are two challenges,
Newer challenge: Check if a string is entirely made of the same substring by
Older challenge: String.prototype.isRepeated by
which are, as far as I can tell, the exact same challenge. This has happened before, and sparked the following discussion: Closing old question as duplicate of a new one.
[C]losing old challenges as dupes of new challenges should be considered on a post-by-post basis, so a meta discussion is probably appropriate for each.
The old challenge is, well, very old, so it does not exactly suit the modern standards. Notably, it's scored on character count instead of byte count. As far as I can tell, this is the only difference.
Should either of these questions be closed as a duplicate of the other? If so, which one?