Creates a new :class:`ConstantUTF8`, adding it to the pool and
        returning it.

        :param value: The value of the new UTF8 string.

def create_utf8(self, value):
        """
        Creates a new :class:`ConstantUTF8`, adding it to the pool and
        returning it.

        :param value: The value of the new UTF8 string.
        """
        self.append((1, value))
        return self.get(self.raw_count - 1)