@Override
    public void drain(Consumer<E> c, WaitStrategy wait, ExitCondition exit)
    {
        MessagePassingQueueUtil.drain(this, c, wait, exit);
    }
Does not null out the first element of `next`, callers must do that
jctools-core/src/main/java/org/jctools/queues/MpUnboundedXaddArrayQueue.java