that could be a good secondary type~
for the Miley Cyrus/Hannah Montana example, I wonder if “box set” might be a better term for that, and also include examples such as:
https://musicbrainz.org/release/62d38d56-629d-48ba-8b97-b6983e318501
all three include other releases whole (plus your example I mentioned), so I feel that is different enough from a split. I can start a new topic/style ticket for this idea tho~