[css-values-4] Sigh, the type of a number is an empty map. Thanks, Oriol.

Author: tabatkins

css-values-4/Overview.bs

@@ -3496,7 +3496,7 @@ Type Checking</h3>
 				: <<flex>>
 				:: the [=CSSNumericValue/type=] is «[ "flex" → 1 ]»
 				: <<calc-constant>>
-				:: the [=CSSNumericValue/type=] is «[ "number" → 1 ]»
+				:: the [=CSSNumericValue/type=] is «[ ]» (empty map)
 				: <<percentage>>
 				::
 					If, in the context in which the [=math function=]