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@wjlow wjlow/
Created May 28, 2018

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class MemorySink[A] extends Sink[A]{
  private var buffer: Vector[A] = Vector.empty

  def replay: Vector[A] = buffer

  def last: Option[A] = buffer.lastOption

  override def apply(a: A): Async[Unit] = Async {
    buffer :+= a
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