Path.reduce() does not remove unnecessary segments between straight lines

[cprcrack]

Description/Steps to reproduce

var path = new Path('M10,10 h10h10h10h10 v10 h-40 z');
path.selected = true;
var copy1 = path.clone(); copy1.reduce();
var copy2 = path.clone(); copy2.simplify();
var copy3 = path.clone(); copy3.flatten();
var copy4 = path.clone(); copy4.smooth({type:'continuous'});
copy1.position.x += 100;
copy2.position.x += 200;
copy3.position.x += 300;
copy4.position.x += 400;
// Expected:
var path2 = new Path('M10,10 h40 v10 h-40 z');
path2.selected = true;
path2.position.y += 50;

Link to reproduction test-case

Expected result

By calling Path.reduce(), I expect a simple path such as M0,0 h10 h10 h10 h10 to be reduced and simplified to M0,0 h40. I also tried with simplify(), flatten() and smooth() and neither work for my purposes.

Additional information

paper 0.12.18

[cprcrack]

I guess the functionality I want is provided by https://github.com/mourner/simplify-js. Can this be done with Paper.js?