Should it work without units?

[breadadams]

Hey, nice library! Whilst using it I first tried only supplying a feature (actual('height')), but this always seems to return 0.

Changing to actual('height', 'px') gives me what I want, however I was somewhat expecting this to be the default behaviour based on the docs - it didn't seem clear to me that this was a required parameter.

So I'm wondering if this is a bug or intended functionality basically 😋