bail out if the inferred ordinal domain has more than 10k values

(see #849 (comment))

Author: Fil

src/scales/ordinal.js

@@ -121,6 +121,7 @@ function inferDomain(channels, interval) {
     const [min, max] = extent(values).map(interval.floor, interval);
     return interval.range(min, interval.offset(max));
   }
+  if (values.size > 10e3) throw new Error("This ordinal domain would have more than 10,000 values. If this is intentional, set the domain explicitly.");
   return sort(values, ascendingDefined);
 }