Dan

I just ran into this issue. Adding `/** @deprecated */` seems like a good and simple fix. What do you think, @DanielRosenwasser?

The issue is that we're stuck on an old version. I'll merge a PR updating to the latest version, if you submit one.

This has been fixed in https://github.com/Skalman/UglifyJS-online/pull/18.

I *think* disabling mangling doesn't change the gzip results (~0.17% worse, like before). I'm also tired, so I might be mistaken. Here's an idea that probably doesn't change anything, but...

My idea to place the `undefined` variable first in the `var` declaration produces slightly worse results. I've tried a few variants to see if the placement of the new `undefined`...

Not creating a new `var` (like my initial impementation) improves uglification by 0.159% (as reported in my initial comment). ```js // Last in the last var (best from my comment...

I've done a bunch of experiments varying how many `void`s are required before they are replaced. In all these experiments a new variable to an existing `var` is placed last,...

Sure, I'll have a look in a few days.

> @Skalman now that #2948 is in, please have another go at this and see if your previous strategies would be more compressible with the new mangle. I tried rebasing...

I'd be interested in implementing this change, unless you think it'd be too complicated. Would this be gated by `unsafe_undefined`? (though I don't understand how this could be unsafe) I'd...