old_contents: from __future__ import print_function
  from enum import IntEnum
  
  import yaml
  
  MemberFlag = IntEnum('MemberFlag', [
      'digest',
      'digest2',
      'modPost',
      'preapprove',
      'noPost',
      'diagnostic',
      'moderator',
      'myopic',
      'superadmin',
      'admin',
      'protected',
      'ccErrors',
      'reports',
      'vacation',
      'ackPost',
      'echoPost',
      'hidden',
      ])
  
  def member_flag_representer(dumper, data):
      return dumper.represent_scalar(u'!flag', data.name)
  yaml.add_representer(MemberFlag, member_flag_representer)
  def member_flag_constructor(loader, node):
      value = loader.construct_scalar(node)
      return MemberFlag[value]
  yaml.SafeLoader.add_constructor(u'!flag', member_flag_constructor)
  
  class ListMember(yaml.YAMLObject):
      yaml_tag = u'!Member'
      yaml_loader = yaml.SafeLoader
      def __init__(self, address, *args, **kwargs):
          self.address = address
          self.flags = set(a for a in args if isinstance(a, MemberFlag))
      def __repr__(self):
          return u'{}({}, flags: {})'.format(
                  self.__class__.__name__,
                  self.address,
                  ', '.join(
                      map(lambda f: f.name,
                          self.flags)
                      ),
                  )
  
new_contents: from __future__ import print_function
  from enum import IntEnum
  
  import yaml
  
  MemberFlag = IntEnum('MemberFlag', [
      'digest',
      'digest2',
      'modPost',
      'preapprove',
      'noPost',
      'diagnostic',
      'moderator',
      'myopic',
      'superadmin',
      'admin',
      'protected',
      'ccErrors',
      'reports',
      'vacation',
      'ackPost',
      'echoPost',
      'hidden',
      ])
  
  def member_flag_representer(dumper, data):
      return dumper.represent_scalar(u'!flag', data.name)
  yaml.add_representer(MemberFlag, member_flag_representer)
  def member_flag_constructor(loader, node):
      value = loader.construct_scalar(node)
      return MemberFlag[value]
  yaml.SafeLoader.add_constructor(u'!flag', member_flag_constructor)
  
  class ListMember(yaml.YAMLObject):
      yaml_tag = u'!Member'
      yaml_loader = yaml.SafeLoader
      def __init__(self, address, *args, **kwargs):
          if isinstance(address, unicode):
              # Attempt to down-convert unicode-string addresses to plain strings
              try:
                  address = str(address)
              except UnicodeEncodeError:
                  pass
          self.address = address
          self.flags = set(a for a in args if isinstance(a, MemberFlag))
      def __repr__(self):
          return u'{}({}, flags: {})'.format(
                  self.__class__.__name__,
                  self.address,
                  ', '.join(
                      map(lambda f: f.name,
                          self.flags)
                      ),
                  )
  
subject: Convert list member addresses to non-unicode strings when possible.