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Goals

<!--- What are you trying to achieve? -->
Hi, my goal is to use ES6 Classes and inheritance as Realm models.
This possibly relates to https://github.com/realm/realm-js/issues/2768
After upgrading realm and react-native from

"realm": "2.23.0",
"react": "16.0.0",
"react-native": "0.50.3",

the following error shows up
Realm object constructor must not return another value

I was wondering if there is any way to get this to work with later versions

https://github.com/realm/realm-js/issues/2768#issuecomment-604438625 This mentions that we shouldn't extend Realm.Object but doesn't say anything else about extending other classes.
https://realm.io/docs/javascript/latest/#classes The docs don't mention anything about this either.

Code Sample

class BaseModel {}
 
export class Account extends BaseModel {
  static schema = {
    name: 'Account',
    primaryKey: 'uuid',
    properties: {
      uuid: 'string',
      id: {type: 'int', indexed: true},
      firstName: 'string',
      lastName: 'string',
      username: 'string',
      apiKey: 'string',
      lastLogin: 'date'
    },
  };
}

database = new Realm({
      path: 'core.realm',
      schema: [
        Account, // eslint-disable-line no-use-before-define
        // ...
      ],
      schemaVersion: 13,
      migration: () => null,
    });

Similar to https://github.com/realm/realm-js/issues/2768 the error goes away when removing the extends

Version of Realm and Tooling

"realm": "^3.6.5",
"react": "^16.13.1",
"react-native": "0.62.0",
node v10.14.2
macOS Catalina 10.15.4

I also tried 5.0.2 and 4.0.0-beta.2 and got the same error