I have run into this issue
https://github.com/typesafehub/activator-akka-stream-scala/issues/37

I want to group a stream and write each substream to a separate file. A
pretty common use case, I'd imagine.

The old version of the GroupLog example showed a groupBy() followed by a
to()

Because of the introduction of SubFlow,  the new version had to introduce
an unacceptable fold() into a strict collection

https://github.com/typesafehub/activator-akka-stream-scala/blob/c63afb5eecf50726c4417157efd26d697b621e99/src/main/scala/sample/stream/GroupLogFile.scala

What are my options? ETA for a fix?
Thanks

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