@classmethod
def finalize(cls, entity, new_value):
    """Finalize the value for this attribute.

        This will be called by the blob when setting the value for this
        attribute, after validation; override it to perform any sanitation
        or transformation. The value should be considered valid.

        :param entity: The entity this attribute is on
        :param new_value: The new, validated value
        :returns: The finalized value
        """
    return new_value
