> But their pushback is for pragmatic reasons I saw zero reasons given for the failure to implement in that thread (which I had not seen before), other than a

> But their pushback is for pragmatic reasons I saw zero reasons given for the failure to implement in that thread (which I had not seen before), other than a brief mention of stack traces (which is quite solvable with a shadow stack). All I saw were several people (including someone involved with the spec) who were bitterly disappointed about the failure to implement. And I forgot that tail call elimination was introduced back in ES5, and yet only JavaScriptCore has implemented it. Which again leads me to believe that most implementers believe it's just not worth the trouble to them to implement a key feature for functional programming, regardless of how much the users want it (the feedback in this thread is similar to what i've seen elsewhere).