mishoo/UglifyJS — pull request #515 by arkarkark (2014-08-04 07:49:06+00:00)
Title: add support for unique ids to help track down tricky minification issues

sometimes (especially with AngularJS) you get errors only in your uglified code that are about function(e){}
which is hard to track down when there are 4700 function(e){}

This option makes each parameter name unique to help you find the area of code where the problem was.
see http://stackoverflow.com/a/25109762/1969871 for an example. I'm not suggesting you use it all the time, but just to help track down problems if they happen.

Hopefully you think this is useful. I'm not sure it's the best way to implement it, but it worked for me.