Great kata, well done.

Reworded description to include : n is the number of matching digits needed to make a set contained within a string within the data.

The description should explicitly mention that a set is composed of 1 digit, that something like this: n=4, azaz -> zaza is not a morphing set. Even though your example shows one-digit sets, it's still ambigious.

Also, I enjoyed the challenge; learned something useful about JavaScript & coding in general, then just had fun with my Python solution.

From a pure coding standpoint, this is a 7 kyu kata. The added layer of having to do a bit of research if you don't know about unicode is the only extra challenge, really.

Just so I'm sure I understand, is the implication that it should be ranked as more difficult or less difficult?

Considering the lowest ranking coder who completed this kata is currently a 3kyu, I don't think it's just me. Constructive criticism time. Whoever ranked this as 6 kyu should be fired.

Yeah, I just missed the point completely, but got it finally!

They appear equal however if you inspect further they are not. The difference is hidden. This is intentional.

In the initial post, the final quote is missing. It can be a copy/paste error, but if it is not, it might mean that the expected contains some starnge unprintable characters.

Besides the topic of the kata makes an impression that comparison of visual forms might be not good thing to do. When I copy the expected from your post to Notepad++, it shows some nonpriontable characters at the end.

What's wrong with it?

'flPJPv2xvBS8cm4orBFH' IS equal 'flPJPv2xvBS8cm4orBFH󠅑󠅧󠅯󠅪󠅮󠅷󠅕'

What's wrong with it?

Error message in random tests is wrong:

encode_hidden_data('flPJPv2xvBS8cm4orBFH', 'QgojnwU'):
'flPJPv2xvBS8cm4orBFH' should equal 'flPJPv2xvBS8cm4orBFH󠅑󠅧󠅯󠅪󠅮󠅷󠅕

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suggested tags: unicode, puzzles