[sqlalchemy] 'validates' include_removes=True doesn't seem to prevent deletion?

[niuji...@gmail.com]

I have the following validator:

    @sa_orm.validates('variant_names', include_removes=True)
    def validate_unique_identifying(self, key, name_dict,
                                    is_remove):
        if is_remove:
            raise ValueError("DOn't")
        else:
            if name_dict.is_primary_identifying_flag is None:
                name_dict.is_primary_identifying_flag = False
            return name_dict


When deleting, I get the raised ValueError, but the deletion occured anyway.
Is this the expected behaviour? Or there is some other settings that can 
prevent the deletion?

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