Example of jsts.operation.polygonize not working on arbitrary "spaghetti" lines

failed-polygonize.js

var jsts = require("jsts"),
    spaghetti = [
        "LINESTRING(-108.6328125 32.54681317351517,-117.7734375 44.33956524809713,-91.0546875 50.51342652633956,-92.46093749999999 30.751277776257812)",
        "LINESTRING(-120.58593749999999 25.48295117535531,-106.5234375 42.032974332441405,-78.046875 40.713955826286046)"
    ],
    reader = new jsts.io.WKTReader(),
    polygonizer = new jsts.operation.polygonize.Polygonizer(),
    polygons, dangles, cutEdges, invalidRingLines;

spaghetti.forEach(function (line) {
    var geom = reader.read(line);

    polygonizer.add(geom);
});

polygons = polygonizer.getPolygons();
process.stdout.write("Polygons: " + JSON.stringify(polygons.array) + "\n\n");

dangles = polygonizer.getDangles();
process.stdout.write("Dangles: " + JSON.stringify(dangles.array) + "\n\n");

cutEdges = polygonizer.getCutEdges();
process.stdout.write("Cut Edges: " + JSON.stringify(cutEdges.array) + "\n\n");

invalidRingLines = polygonizer.getInvalidRingLines();
process.stdout.write("Invalid Ring Lines: " + JSON.stringify(invalidRingLines.array) + "\n\n");