While I do think that many of the issues people are reporting with this kata could be solved by reading it a bit more closely, I also think that the description for this kata leaves something to be desired. The ability to read insructions carefully and accurately parse them is an important skill in programming but I think the (description for this) kata is just poorly organized/written.

Perhaps:

• starting with the more general overview would be helpful, as it gives a more broad understanding of the problem
• giving function parameters more descriptive names would allow for a better understanding of the problem, not to mention that using specific & descriptive names is an important part of writing understandable code
• adding a note about the rounding could avoid confusion, instead of relying on one iteration in one specific example to communicate how rounding should be approached in the kata. If theres a note about percentage conversion, which is arguably more straightforward and obvious than how rouning should be performed, why not make one for rounding requirements?
• describing the input limitations could be done in the order that the parameters are listed in the function definition and each one could get their own line.

I feel like I've been frequently seeing discussions like the one for this kata in this 8-6 kyu range. In the end everyone seems annoyed, including the author of the kata. I think a lot of this annoyance could be avoided by writing more explicit and clean descriptions. /rant

The mistake is that you're looking for individual digits, not whole numbers.

Although it can be gleaned from the examples, the description should state that consecutive integers are considered as one number.

E.g. you should extract and sum 20 + 5 from 'hello20world5'

I'm only about 5 years late here, but I think it's great. You walked through the examples in a clear fashion and
that helped me understand what I needed to do! Had a lot of fun solving this one.