I concede the difference between "functional" as in composition and "pure". That's a significant point. The proposal is interesting. It looks pretty thin com

I concede the difference between "functional" as in composition and "pure". That's a significant point. The proposal is interesting. It looks pretty thin compared to a typical TC39 proposal though. I haven't encountered the language feature before. I'm not sure what I think about it yet. I'm doubtful whether this makes it into the standard in the next 10 years, unless react affiliates somehow take over the committee. Immutability is a pretty good tool in a lot of problem domains. But perhaps the main thing I dislike about react (and there are many) is that not only do I "not have to" rely on mutable state. I can't decide to either. Or at least, they make it tough.