Returned objects not lean. Cannot set lean option. (Typescript)

[N8th8n8el]

Steps to reproduce

I am creating a feathers-service:

import service from 'feathers-mongoose';
...
 app.use('serviceName', service({Model: MyModel}));
...

I have noticed that, when I console.log(context.result); in an after hook (create) that the resulting object is not lean, i.e. it contains mongoDB stuff like __id and __v.
I tried to set the lean option explicitly:

  app.use('serviceName', service({Model: MyModel, lean: true}));

but then Typescript complains. The Problem is the following line (l.34 in types/index.d.ts) :

declare const mongoose: ((config?: Partial<MongooseServiceOptions>) => Service);

where MongooseServiceOptions extends ServiceOptions which in turn is imported from
@feathersjs/adapter-commons.

In adapter-commons/src/service.ts the said interface is exported, but the lean attribute is missing:

export interface ServiceOptions {
  events: string[];
  multi: boolean|string[];
  id: string;
  paginate: any;
  whitelist: string[];
  filters: string[];
}

System configuration

I am using Typescript.

Module versions (especially the part that's not working):
feathers-mongoose: 8.0.1
feathersjs: 4.3.0-pre.2

NodeJS version:
node:10-stretch

Operating System:
MacOS 10.14.6 running Docker Engine 19.03.1 and Compose 1.12.1
The application is running inside a docker container (node:10-stretch)