What is the problem you're trying to solve?

Follow-up from #8647: while I would prefer width <= 400px over max-width: 400px, I don't think there's a reason to prefer width = 400px over width: 400px. I would prefer the rule to enforce the latter for compatibility and consistency with other media queries.

What solution would you like to see?

An option: "except": ["equality"] for this rule