new_contents: from ...tokens import Doc
  from ...vocab import Vocab
  
  def test_issue599():
      doc = Doc(Vocab())
      doc.is_tagged = True
      doc.is_parsed = True
      bytes_ = doc.to_bytes()
      doc2 = Doc(doc.vocab)
      doc2.from_bytes(bytes_)
      assert doc2.is_parsed
  
subject: Test Issue #599: .is_tagged and .is_parsed attributes not reflected after deserialization for empty documents.