From my initial testing it looks like 14.2.4 fully supports the deduplication mentioned here:

However, I'm not sure where the struct object_manifest script goes in relation to foo and foo-chunk, and I'm not aware of what the offsets/caspool should be.

If this still isn't fully implemented how does the dedup tool work? If I remove a file but it exists elsewhere on the volume, will it be purged or would the tool need to run again to clear the data?