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kotlinlang

Hi!

Consider this bit:
```
Single.zip(
  single1.delay(3000, MILLIS), 
  single2)
```

It will emit a value at least after `3secs` pass after emission of either single.
but in case `single2` emits an error, it will be delivered to the downstream immediately.
Is there a way to tell `zip` to emit an error after it has a next/error from *both* of its arguments? It is safe to assume that `single1` will never emit an error here, only `single2` can.