buffer returns an invalid result

[vissarion]

The following returns an invalid result in 1.84 (while returning MULTIPOLYGON() in 1.78).

#include <boost/geometry.hpp>

int main() {

    using Point = boost::geometry::model::d2::point_xy<double>;
    using Polygon = boost::geometry::model::polygon<Point>;
    using Linestring = boost::geometry::model::linestring<Point>;
    using MultiPolygon = boost::geometry::model::multi_polygon<Polygon>;
    using MultiLinestring = boost::geometry::model::multi_linestring<Linestring>;

    boost::geometry::strategy::buffer::join_round join_strategy(36);
    boost::geometry::strategy::buffer::distance_symmetric<double> distance_strategy(1.0);
    boost::geometry::strategy::buffer::end_round end_strategy(36);
    boost::geometry::strategy::buffer::side_straight side_strategy;
    boost::geometry::strategy::buffer::point_circle point_strategy;

    MultiLinestring l1;
    boost::geometry::read_wkt("MULTILINESTRING((11393 -19530,\
    -5728 30983,-9223372036854775807 15322,27608 14504),\
    (-32468 -20811,-27782 -14559,-30822 11140,-12550 27458),\
    (24176 -9103,4178 -868,7332 11648,21439 30360,-121 11529,8803 -10835,5660 20213))", l1);

    MultiPolygon result;

    boost::geometry::buffer(l1, result,
                            distance_strategy, side_strategy,
                            join_strategy, end_strategy, point_strategy);

    std::cout << boost::geometry::wkt(result) << std::endl;
    std::cout << boost::geometry::is_valid(result) << std::endl;
}

[barendgehrels]

This is probably an artificial testcase. We might detect the -9223372036854775807 value, somehow.