How does PouchDB deal with conflicts when syncing to CouchDB?

~~Since the docs mention this being a bit of an open problem a decade ago when dealing with online clients and servers (https://writing.jan.io/2013/12/19/understanding-couchdb-conf...) I'd imagine its a bit more complex with many intermittently online clients.~~

Documented here: https://pouchdb.com/guides/conflicts.html