old_contents: __version_info__ = ('0', '1', '0')
  __version__ = '.'.join(__version_info__)
  
  def Astral(*args, **kwargs):
      from astral.node import Node
      return Node(*args, **kwargs)
  
new_contents: __version_info__ = ('0', '1', '0')
  __version__ = '.'.join(__version_info__)
  
subject: Remove unused class.