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Is intermediate flow operators are cancellable? Are they cancelled when the calling scope is cancelled? For instance:
```// If the collecting scope is cancelled before this map operation,
// seems like map operation is not cancelled and throws an exception
numbersFlow.map {
    // There is an operation which throws exception
}
.flowOn(<http://Dispatchers.IO|Dispatchers.IO>)```
I have to use `ensureActive()` before mapping but is it the expected behaviour?

I can also use `catch`  but just curious why it is not cancelled itself since the calling scope is cancelled

Ok. Intermediate operators are not suspend functions and this is why they are not cancellable like normal coroutine suspend functions. They are in deed normal functions. So `ensureActive` or `isActive` should be used. <https://github.com/Kotlin/kotlinx.coroutines/issues/1460#issuecomment-523985861|https://github.com/Kotlin/kotlinx.coroutines/issues/1460#issuecomment-523985861>