Congrats on the release of 2.5.

Isn't the documentation and accompanying sample for Resumable Projections a
bit odd?

http://doc.akka.io/docs/akka/2.5.0/scala/persistence-query.html#Resumable_projections
https://github.com/akka/akka/blob/master/akka-docs/rst/scala/code/docs/persistence/query/PersistenceQueryDocSpec.scala

Why would we be constructing a Sequence? Wouldn't the offset be stored in a
plugin-agnostic way and just passed back? In my case, the offset is in a
Protobuf persistence event, and I'm assuming I would have to convert it
(whether Long or TimeUUID) to a ByteString and use a Protobuf field of type
"bytes".


   1. bidProjection.latestOffset.foreach { startFromOffset =>
   2. readJournal
   3. .eventsByTag("bid", Sequence(startFromOffset))
   4. .mapAsync(8) { envelope => (writer ? envelope.event).map(_ => envelope
   .offset) }
   5. .mapAsync(1) { offset => bidProjection.saveProgress(offset) }
   6. .runWith(Sink.ignore)

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