Unable to override border radius on Hdy.Window

What problem did you encounter?

When adding support for Hdy.Window (window.unified decoration) to the elementary stylesheet, I am unable to override the built in 8px border radius

In what part of libhandy did you experience the problem? Note that multiple boxes may be checked.

HdyWindow

What is the actual behaviour?

The border radius property is derived from shared.css

What is the expected behaviour?

The border radius property is derived from the system stylesheet

How to reproduce?

Use this branch of the elementary stylesheet with an app that uses HdyWindow

Which version did you encounter the bug in?

I compiled myself from commit b61eefde06040703026f49a0b979588e69f77d3a