It's too bad that Realm's core technology isn't open source, it would be interesting to see what other immutable databases (e.g. Datomic) would do with the idea

It's too bad that Realm's core technology isn't open source, it would be interesting to see what other immutable databases (e.g. Datomic) would do with the ideas they've come up with. Also grafting Datascript onto Realm for a datalog competitor to sqlite would be sweet.