The reference solution returns False not True.

Thank you

@AcesOfGlory:
Great explanation, thank you for all the details.
Just to correct you a little - in your code the last expression evaluates to:
[1, 2, 45, 6, 5, 4]
and not to
[1, 2, 4, 5, 6, 45]
I think you had a typo.

Thanks you for both your feedback and your time.

According to the type signature, they're a and [a]. Also, you have the Example tests.

Closing.

Byond my imagination.

Oh my..how does one even think of that

Added constraints to input.

Exercise test cases are now fixed.

Thanks!

xs = array
s = element

I updated the description to try to make it clear what the expectations of this kata are. I added more example tests and 100 random tests.

Please mark as resolved if you think these updates have fixed the kata!

Glad you like it!