autoDisposable 
  Entry point for auto-disposing streams from a ScopeProvider.
Example usage:
  Observable.just(1)
       .to(autoDisposable(scope)) // Static import
       .subscribe(...)
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Return
an AutoDisposeConverter to transform with operators like to
Parameters
provider
the target scope provider
<T>
the stream type.
Entry point for auto-disposing streams from a CompletableSource.
Example usage:
  Observable.just(1)
       .to(autoDisposable(scope)) // Static import
       .subscribe(...)
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Return
an AutoDisposeConverter to transform with operators like to
Parameters
scope
the target scope
<T>
the stream type.