If duplicates is a listing, what happens if there are more then 25 duplicates? Does it require subsequent requests? If so, then perhaps this should be `get_duplicates` and return a `get_content` generator for iterating over the list of duplicates.

If there is a finite limit, the limit should be mentioned, and the results should be cached similar to how the `comments` property works (but you don't need a setter in this case).