[css-easing-2][editorial] clarify source of infinites

Author: tabatkins

css-easing-2/Overview.bs

@@ -161,7 +161,9 @@ Note: While CSS numbers have a theoretically infinite range
 (see [[css-values-4#numeric-ranges]])
 UAs will automatically clamp enormous numbers to a reasonable range.
 If easing functions are used outside of the CSS context,
-care must be taken to either correctly handle potential infinities,
+care must be taken to either correctly handle potential infinities
+(including those produced by merely <em>very large</em> values
+stored in a floating point number),
 or clamp the [=output progress value=].
 
 Some types of easing functions