artifacts between rounded cuboid and extruded appendArc

[Evgsurf]

There is some black magic. Arc from rounded cuboid and just arc from path with the same segments are not equal.

const jscad = require('@jscad/modeling')
const { arc, circle, ellipse, line, polygon, rectangle, roundedRectangle, square, star } = require('@jscad/modeling').primitives
const { translate } = require('@jscad/modeling').transforms
const { extrudeRectangular, extrudeLinear, extrudeRotate } = jscad.extrusions
const { path2, geom2 } = jscad.geometries
const { cube, cuboid, cylinder, cylinderElliptic, ellipsoid, geodesicSphere, roundedCuboid, roundedCylinder, sphere, torus, polyhedron } = jscad.primitives
const { union, subtract, intersect } = jscad.booleans

const main = () => {

  const SEGMENTS =  64;


  let path = path2.create([[0,0],[10,0]]);
  path = path2.appendArc({endpoint:[0,10],radius: [10,10],segments:SEGMENTS},path);
  path = path2.close(path);
      geom2.fromPoints(path2.toPoints(path2.close(path)))
                 )
               );
//  return cuboid({size:[10,10,10]});
  const cub = roundedCuboid({size: [40, 40, 40], roundRadius: 10, segments:SEGMENTS});

  return [translate([-20,-20,0],subtract(sec,cub)),
          translate([20,20,0],subtract(cub,sec))]
  ;

}

module.exports = { main }      geom2.fromPoints(path2.toPoints(path2.close(path)))
                 )
               );
//  return cuboid({size:[10,10,10]});
  const cub = roundedCuboid({size: [40, 40, 40], roundRadius: 10, segments:SEGMENTS});

  return [translate([-20,-20,0],subtract(sec,cub)),
          translate([20,20,0],subtract(cub,sec))]
  ;

}

module.exports = { main }

The result on the image

[Evgsurf]

[Evgsurf]

As I can find the problem is appendArc function, which generates unexpected count of segments.

[Evgsurf]

This code generate arc. I expect to get 4 segments, but really there is 5

  const SEGMENTS =  8;


  let path = path2.create([[10,0]]);
  path = path2.appendArc({endpoint:[-10,0],radius: [10,10],segments:SEGMENTS},path);

[z3dev]

@Evgsurf Nice find! That code has been around for a long long time, so there may be some strange logic.

We still accept fixes for V2, so if you have time... how about changing the code?