@ericf, you mentioned:
> Well once we have the list of unknown query params, we can test whether they are parse(), if not, then we can assume they are simply a width value, which we can wrap with "screen and (min-width:" + value + ")", then test whether that's a media query with parse().

We should be doing some type of integer check. Otherwise it seems fragile. What if you write `?sm=crap`?