But note that the Stopify portion is completely optional and composes onto the end of an existing JavaScript compiler. So you can offer a faster-but-no-stopific

But note that the Stopify portion is completely optional and composes onto the end of an existing JavaScript compiler. So you can offer a faster-but-no-stopification mode versus a slower-but-with-stopification mode. While modes can be annoying, the point is that you don't have to be forced to pay this price due to the Stopify infrastructure. In contrast, a language like Pyret has the stopification built into its back-end, so you always pay the price (for now), whether you want it or not.