> Come to think of it, if the users did have this, they might
> be able to report an error message back to us with a line number in it.

That is true iff the feature runs all the time, and not based on some toggle flag.
It's hard to imagine that impacting performance significantly.
It's just one more step in js compilation.
But ...

1. If the code is clean, not minimized, pushing it through this machine could make it worse, not better.
In fact we might skip this step for any js with more than 20 lines, as that is probably not minimized.
So if jmin is set and line count < 20 then deminimize it.

2. We would have to know this machine works for *every* js out there.
A utf8 char or a really weird regular expression won't derail it.
So it's another possible point of failure.

So I might like to keep this feature for us, based on a flag or something, and then the normal user
wouldn't give us a meaningful line number, but we probably have to reproduce his bug in our world anyways, so we just turn the flag on.

Karl Dahlke