Mobx-Utils IObservableStream interface is not compatible with RxJs 7.8.1 Obserable interface

[C3ntraX]

Intended outcome:
The interfaces from mobx-utils and rxjs do not match, but regarding the documentation they should match.

Converts a subscribable, observable stream (TC 39 observable / RxJS stream) into an object which stores the current value (as current).

Actual outcome:

How to reproduce the issue:

See codesandbox:
https://codesandbox.io/s/dreamy-star-42vpxy?file=/src/index.ts

Versions

MobX: 6.11.0
MobX-Utils: 6.0.8
RxJs: 7.8.1