Provides at most the first
n values of this stream.
Forwards the first n data events of this stream, and all error events, to
the returned stream, and ends with a done event.
If this stream produces fewer than count values before it's done, so will the returned stream.
Stops listening to the stream after the first n elements have been received.
Internally the method cancels its subscription after these elements. This means that single-subscription (non-broadcast) streams are closed and cannot be reused after a call to this method.
The returned stream is a broadcast stream if this stream is. For a broadcast stream, the events are only counted from the time the returned stream is listened to
@override Observable<T> take(int count) => Observable<T>(_stream.take(count));