When minifing comma operator syntax, the behaviour of the minified code changes

[DenisaSurdu]

The problem

Given this function:
function test2(){ var a = "some text"; return a+="help", a+=" some more help";} which returns "some texthelp some more help"
When minified, gets converted into something like:
function test2(){ var a = "some text"; return a+"help", a+=" some more help";} which returns "some text some more help"

Note the return a+"help"

This represents an issue when including in cassette .min.js files with a similar syntax as above - especially when the .min.js are 3rd party libraries. (I have noticed this when I used cassette with the colors plugin from Froala)