retry operator hangs in infinite loop when undefined passed as count

[artaommahe]

RxJS version:
5.4.2

Code to reproduce:

const count: number;

Observable.throw(null)
  .do(() => null, () => console.log('ERROR'))
  .retry(count)
  .subscribe();

Expected behavior:
No retries, single ERROR in console

Actual behavior:
Infinite retries

Additional information:
It's case when we passed retries count from above and it can be undefined.

[kwonoj]

For me this is similar cases to #2144 (comment), in general you can't expect default behavior with unexepcted input value, in this case undefined. retry strictly requires number as parameter and caller should ensure input, either providing 0 to get no retry behavior or certain other numbers.

[lock]

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