map
suspend fun <Input, Output, InputLabel, TFrom, TInto> StageScope<Input, Output, InputLabel>.mapIterableStageOrThrow(collection: Collection<TFrom>, name: String, itemBlock: suspend StageScope<Input, Output, InputLabel>.(TFrom) -> TInto): List<TInto>
Convenience wrapper that maps a collection, enclosing it in a dedicated stage. Pros: automatically sets substagesTotal to enable ETC calculation.
If any item throws, the stage will immediately throw as well.