Because this is an old kata, most of these are overranked.

I guess because it use objects.

Exactly what I thought.

Why this is 7kyu and not 8kyu?

Use spoiler flag next time, please.

Is this still an issue?

Where is this written?

it was in the description, before the author changed it again.

EDIT: seems the java version is consistent with the description, now (err... it was before, yeah, but now the wording is understandable ;p ).

@Blind4Basics:

Letters cant be of any case and 'a' != 'A'

Where is this written?
BTW, I believe there is nothing wrong with error.

@My- :

I've changed the reference solution, and I can revert back to the orginal if you want.

Why I've changed that?

Because the description states that(and at the time of writing, still states that): Same letters share same digit, regardless of case, and it should obvious that description is prior to the reference solution: description cannot be wrong, because you can do whatever you want, but once description is set, reference solution should follow it, but both of your rust and java solution were wrong as they were assigning different digits to different letters(Am I sure about that? Yes, because prior to my update of reference solution, my Java solution which was mapping different cases to different letters was valid).

BTW, you gotta be precise: What is actually wrong now? I can't find any useful information from the replies below.

Thanks for guidline. I'll try to solve everything over the weekend. Now I realy need to get some sleep before work. It is quite late were I'm.

It looks like I misunderstood you before. I tought you wanted more mix letter word tests as at that time all (apart one) were in uppercase..

Read here for my suggestion what to do.

Sorry about all this mess... I didn't expected what someone could change original solution I had. I changed description back to were it was as otherwise current Java version would make no sence... but now Rust version are incosistent to Java one.
@Blind4Basics honestly I don't know what should I do at this situation..

And now I'm reading it... Here are two languages for this kata and plenty of solutions taking in account mix letters ('a' != 'A') and test.. I believe it would be easier to update description rather than change solution.
I was trying to resolve issues without knowing what solution was changed... My bad I should read all posts but I didn't expect someone did change solution I had before. Now is a mess...
... and I thought I'll be happy finally getting my firs authored kata approved...

I think possible course of actions could be:

• You, as the author of the kata, make up your mind and express somehow, somewhee, your intent. Should letters be recongnized in case sensitive way, or case insensitive? Put it in a post or, preferrably, in a description.
• Raise an issue and tell which language version does not hold to your idea and explain why you cannot fix it. Power users will eventually take care of it. You can raise separate issues for every incorrect language version, so people familiar with diffeerent languages could work on them separately.
• Review translations whether they hold to your intent and comment on them if they do not. If you cannot read the language, leave it or comment and ask for verification.

Things will eventually get sorted out by others. Just guide them and make it clear HOW it should be. Usually description is used as the baseline, so update description and raise issues about language versions which do not stick to it, and mark obsolete ones as resolved or reraised.

Do not worry about existing solutions. They might get invalidated, but it usually is not that big deal and rewarded users will keep their points.