Should the description be updated? I believe the example is clear, but several users had issues understanding the task.

Not a kata issue

gimme dat legion

EDIT: nvm

Random tests: modifying the input changes the expected result.

approved some time ago

Crystal: no sample tests

That being said, that is to say, after what you've just said, I think we could all agree, not to disagree about the confusion negating a negation causes to us mere mortals.

Rather, not as feasibly unsimple in some other unspecified way as it could potentially have been in approximately the way that it actually was, all things considered.

approved

Yes, I updated the kata to Clojure 1.8.0 and updated the tests cases

Is Clojure still accessible?

Indded, simpler this way.

Same reason that politicians say "you're not wrong.." ? :)

"not immutable" -> why not just say "mutable"?