What I don't like is lack of features that would erase whole classes of software around it. For example, function environments (substitute the global scope with another object for a single invocation) could delete lots of code and paradigm from vue/rx-likes.

It also neither supports operator overloads (good thing in general) nor has a decimal type which is a must for human numbers like euros and kilograms. Rather it includes the mostly useless bigint.

It also does nothing to fix the mentioned quirks like sort(). It could e.g. include cmp(a, b), and propcmp(name[,cmp]) off the shelf so the issue wasn't wordy at least: nums.sort(cmp), objs.sort(propcmp("id")).