shorter error message

Author: mbostock

src/scales/ordinal.js

@@ -123,7 +123,7 @@ function inferDomain(channels, interval, key) {
     const [min, max] = extent(values).map(interval.floor, interval);
     return interval.range(min, interval.offset(max));
   }
-  if (values.size > 10e3 && registry.get(key) === position) throw new Error("This position domain would have more than 10,000 ordinal values. If this is intentional, set the domain explicitly.");
+  if (values.size > 10e3 && registry.get(key) === position) throw new Error("implicit ordinal position domain has more than 10,000 values");
   return sort(values, ascendingDefined);
 }