repository content 'compare' api does not work properly with library CVV
1. sync down a repository to some repo (with n packages)
2. create a cv and filter out at least one package (has n-1 packages)
3. call the compare api, passing in the library CVV and your new cv:
curl -X GET -u admin:changeme "https://`hostname`/katello/api/v2/packages/compare?repository_id=1&content_view_version_ids\[\]=12&content_view_version_ids\[\]=1&page=1"
The results will only include n-1 results, not n. It seems to be ignoring packages ONLY in the library CVV