Please unlock new version of Crystal, old version has bugs that prevent reasonable solutions.

Crystal version is broken due to overflow bug.

Crystal version is bugged, and tests refer to non-existent functions. (what Munto said a year ago)

This kata is broken (at least in Crystal). If value times index is equal, it doesn't specify that it wants, and tests are basically random.

Crystal

Crystal really needs some tests.

This kata is just broken. What is supposed to happen with negative numbers and start == stop etc. is basically anyone's guess, and there doesn't even seem to be any consistent answer.

Image is dead, and annulus is defined by two radii not one.

It needs to test "a\n", "b\n" etc.

Could we get a filter on https://www.codewars.com/kata/ for "Katas I have not completed in selected language"?
I mostly use codewars to practice new languages, and new languages don't have many katas, so if I want to practice some Elixir, I want everything I didn't do in Elixir yet, even if I already did that in Python or something.

I don't see any way to filter this.

Calculating fib and then looking at last digits is not supposed to work for this as your computer will run out of memory before that happens. Also it will probably run out of CPU time. You need more clever algorithm.

It's broken for Postgres. It expects median to be a Float, but postgres will never return a Float - it will be either Fixnum (if you take middle element) or BigDecimal (if you average two middle elements).