I think the compile target is basically not a big problem, and there's been explicit work to make the Browser just one Platform. Also, see the `Process` module in the core docs for a hint of the future, regardless of where it lands (this would also work well for WebWorkers etc, and is handled right now by a naive scheduler). Concern over the compile target should be super low - if you've built a language of sorts, you should have a feel for how it's not that big of a deal to tweak the target.