gruntjs/grunt-contrib-uglify — pull request #76 by mzgol (2013-08-07 19:34:36+00:00)
Title: support UglifyJS screw_ie8 option via screwIe8 property

By default UglifyJS tries to be IE-proof, passing screw_ie8 makes
it not care about IE<9 quirks like leaking named function expressions
names to the outer scope. If a project doesn't support IE8, passing
this flag can reduce the output file size.