How to extrude in a given direction (not normal)?

Hi all, I'm trying to extrude a 2D wire in a direction that isn't normal to the workplane. Obviously something is wrong with my usage of `extrudeLinear` - that I thought could be used the same way as `extrude`.

Could someone guide me to the proper way of doing this?

Cheers

```python
import cadquery as cq

pts = [
(0, 0),
(1, 0),
(1, 1),
(0, 1),
]

w = (
cq.Workplane()
.polyline(pts)
.close()
.extrudeLinear(......)
)

```