Problem

Realm.Set extends Realm.Collection but doesn't implement the length property. It's true that you can access the size of a Set with size, but still this breaks the polymorphism contract with the parent class.

Also, documentation is lacking in the reference: https://www.mongodb.com/docs/realm-sdks/js/latest/Realm.Set.html#length.

Solution

Option 1: Implement length just by delegating to size.

Option 2: Extend the documentation.

How important is this improvement for you?

I'd like to see it, but have a workaround