Convert your points to (and from) JSON.

(new Point).toJSON()

For a list of points: let listStr = stage.gearBox.points.toJSON() stage.gearBox.points.fromJSON(listStr)

The fromJSON returns a new list. To mutate in place, apply mutate=true

stage.gearBox.points.fromJSON(listStr, true)

when mutating, additional points (from the json string) are created and applied immediately. For example, if the target pointlist has 4 points, applying a listStr of 6 points will generate 2 new points.

let points = new PointList(
      [20, 40, 23 ]
    , [30, 30, 200, 30]
    , [10, 20, 200, 30]
).cast()
let s = points.toJSON()
points.fromJSON(s, true)