undefined behavior when specifying threedimensional rounded radius

I've tried to use this command to se if I could round in just one axis
```
cube(size = [w, h, 2], center = true, r=[1,0,0]);
```
instead of
```
cube(size = [w, h, 2], center = true, r=1);
```

and it atually compiles and generate something on STL file but probably an incomplete file as the preview is very simple and unsimilar to the project.

suggestion: In fact it would be great to be able to round in different dimensions on the future
Cheers!