void ModMatchExpression::serialize(BSONObjBuilder* out) const {
    out->append(path(), BSON("$mod" << BSON_ARRAY(_divisor << _remainder)));
}
void ModMatchExpression::serialize(BSONObjBuilder* out) const {
    out->append(path(), BSON("$mod" << BSON_ARRAY(_divisor << _remainder)));
}