import { type ObservedValueOf } from "https://deno.land/x/rxjs@v1.0.2/mod.ts";
Extracts the type from an ObservableInput<any>. If you have
O extends ObservableInput<any> and you pass in Observable<number>, or
Promise<number>, etc, it will type as number.
definition: O extends ObservableInput<infer T> ? T : never