code: private void readObject(java.io.ObjectInputStream s)
        throws java.io.IOException, ClassNotFoundException {
      s.defaultReadObject();
  
      int length = s.readInt();
      ImmutableLongArray.Builder builder = ImmutableLongArray.builder();
      for (int i = 0; i < length; i++) {
        builder.add(doubleToRawLongBits(s.readDouble()));
      }
      this.longs = new AtomicLongArray(builder.build().toArray());
    }
docs: Reconstitutes the instance from a stream (that is, deserializes it).