The CouchDB-style `_conflicts` key doesn't work reliably in CBL: there are some edge cases where it won't appear even though it should. Fixing those would be very difficult. Instead I created a more straightforward way to find conflicts — create an all-docs query and set its `allDocsMode` to `kCBLOnlyConflicts`. The results will only include docs in conflict and for each row you can use `.conflictingRevisions` to find the revisions.