[csswg-drafts] [css-color] What happens in colo() if you pass numbers to a named colorspace, or vice versa?

tabatkins has just created a new issue for 
https://github.com/w3c/csswg-drafts:

== [css-color] What happens in colo() if you pass numbers to a named 
colorspace, or vice versa?  ==
I'm rewriting the `color()` section a bit, and I realized that 
error-handling for passing the wrong *type* of argument to `color()` 
isn't defined.  That is, what if you write `color(rec2020 "foo")`?

Similar cases: `color(pantone .1 .2 .3)` (expects a string, gets 
numbers), and `color(pantone "foo")` (correctly gets a string, but an 
unknown value).

I think the latter two should maybe fallback?  The first one could 
maybe do that too, but alternately it could just fill in all channels 
with 0.

Please view or discuss this issue at 
https://github.com/w3c/csswg-drafts/issues/348 using your GitHub 
account