title: RxJS lettable operators for Observable.create
body: <p>Is there a lettable operator for <code>Observable.create()</code> imported from <code>rxjs/Observable</code>?</p>
  
  <p>I already replaced the <code>Observable.of()</code> also imported from <code>rxjs/Observable</code> by the lettable operator <code>of()</code> imported from <code>rxjs/observable/of</code>.</p>
  
  <p>But I could not find a lettable operator for the first issue, anyone who could help?</p>
  
  <p>EDIT: Not a duplicate, this question is about using Observable.create() as a lettable operator, and not about importing and using lettable static operators as Observable.of()</p>