I just passed it in Crystal, so your algorithm wasn't as good as possible.

Which language? Which algorithm? When reporting an issue, please, be specific.

I think there is a bias toward the Python language in this Kata, in python -2 would 'wrap' to the second element from the end of the array
If start == stop then I imagine the original array should be returned ?

"Redacted"

Done in last iteration.

Duplicate issue anyway. Closing.

Added sample and random tests

Added sample tests and updated description.

You can find a function to resolve that :)

you can explicitly cast to a float

language?

That should be suggestion not issue.

Added.

Exercise test cases are now fixed.

I've just added one :-)