old_contents: from wtforms.fields.core import *
  
  # Compatibility imports
  from wtforms.fields.core import Label, Field, _unset_value, SelectFieldBase
  
new_contents: from wtforms.fields.core import *
  
  # Compatibility imports
  from wtforms.fields.core import Label, Field, _unset_value, SelectFieldBase, Flags
  
subject: Make Flags importable too.