If '1' and 1 should be treated as different elements, then shouldn't arraysSimilar([1, '1', 2], ['1', 1, 2]) return true? I think sort-based solutions will return false in that case. Would be nice if the description was more specific on this point. Edit: sort with the standard comparison function won't work, a custom one could.

Ok. I updated the description to show a test case that includes a string.

It was me. I added the additional test case because on one of the solution threads someone mentioned that many of the answers were using toString() to check for similarities between arrays, but that isn't a great answer because the data types could be different yet mean the same thing when converted to strings. By not expecting the arrays to contain uniform data types it makes the kata more representative of a real world usage.

I hope this fits with your original vision for the challenge. We are still working out the best way to handle collaborative editing on the site.