The description says to return 'null' in C#, 'None' in Rust, etc. It doesn't say anything about return types in R.

I think your point stands for the 'R' version though, because it is disproportionately difficult in R for an 8 Kyu kata - no beginner R programmer is going to think of the difference in return types between 'return(NULL)' and 'return(NA)'.

I agree with you that the R version really needs a hint to use an 'NA' return type.

Please use a spoiler flag, comments are visible to everyone by default.

I agree it's very expensive at runtime.

I understand. I think there is a) not to reinvent the wheels, and b) write one's own code to show capability. Depending on the goals we may have different views, but I completely understand you.

You can comment in the already open issue. Or try to fix the problem with a fork.

Duplicate issue.

Thanks for giving the R translation a try!
The bug that was creating the NA values should be fixed now.

I've never tried it but I think it should be possible to forfeit the kata and create translation for it then. However this probably means you will get no points for the translation, or for any future solution, I am not 100% sure on this though.

Don't be so "rigid" (as far as I know there is no R standard imposing the type of the return and strings are a natural way for communicating); you should be the only alleged specialist authorized to publish R translations:-). Nevertheless thank for your posts.

Not a kata issue. A kata author can ask for the return he wants and strings are correct returns.

Can you be more precise about standards? Issues must be clearly justified.
Anyway it is impossible to delete a kata...

'alr approved some time ago'

Ok, it runs good, so I approved it.