old_contents: from sqlalchemy import func
  from sqlalchemy.ext.hybrid import Comparator
  
  
  class CaseInsensitiveComparator(Comparator):
      def __eq__(self, other):
          return func.lower(self.__clause_element__()) == func.lower(other)
  
new_contents: from sqlalchemy import String
  
  
  class CaseInsensitiveComparator(String.Comparator):
      def __eq__(self, other):
          return func.lower(self.__clause_element__()) == func.lower(other)
  
subject: Change CaseInsensitiveComparator to support all operations.