old_contents: from IPython.html.widgets import DOMWidget
  from IPython.utils.traitlets import Int, Unicode, List
  
  class BitWidget(DOMWidget):
      _view_module = Unicode('nbextensions/bitdget', sync=True)
      _view_name = Unicode('BitView', sync=True)
  
  
      bitwidth = Int(2, sync=True)
      data = List([True, False, True, False], sync=True)
  
new_contents: from IPython.html.widgets import DOMWidget
  from IPython.utils.traitlets import Int, Unicode, List
  
  class BitWidget(DOMWidget):
      _view_module = Unicode('nbextensions/bitjet', sync=True)
      _view_name = Unicode('BitView', sync=True)
  
  
      bitwidth = Int(2, sync=True)
      data = List([True, False, True, False], sync=True)
  
subject: Rename to bitjet