The instruction say one thing, but mean the other. It is completely confusing.

In the case of a and b being of equal length you say to treat a as the shorter, but then you treat a as the longer.

Please clarify.

You've stated in the problem write up that it returns a list. It returns an array.

Also what you were saying about arithemtic sequences up to n didn't make sense. You should clarify that.

Furthermore you provided no negative example in the instructions.

This kata is confusing because the instructions contain the following example:

input: {"Bilal"}
output: {"Hello,Bilal"}

There is an implied space between "Hello," and "Bilal" that doesn't seem to show in the instructions