mangle option for UglifyJsPlugin is true, not false

[PinkyJie]

In this document, http://webpack.github.io/docs/list-of-plugins.html#uglifyjsplugin.

It says By default the mangle option is false., but actully the default mangle option is true. (We can infer this from the subsequent sentence But you can configure the plugin to avoid mangling specific variable names by passing an except list.) I also check the source code of UglifyJSPlugin at https://github.com/webpack/webpack/blob/master/lib/optimize/UglifyJsPlugin.js#L90 :
if(options.mangle !== false) {...}
Unless we explicitly give it a false value, it will still do the mangling thing.

[PinkyJie]

Seems the latest documentation fixed this issue.