I know that porting answers to other languages is permitted (and sometimes encouraged) but is porting answers to other versions of the same language allowed?
I came across an answer earlier which was a direct port, to an older version of the language, of an answer I'd posted to the same challenge. My original reaction was to downvote it for showing no original research but I thought it best to check first, whether ports like that are or are not permitted by any site rules or etiquette.
If it's not permitted, what action should be taken with offending answers? And, as a follow up, does challenge (in)activity have any bearing on when such ports would be allowed?