• JS: fix parsing in identifier in group expressions
• JS: fix parsing identifiers inside arrow function body in some cases #324
• JS: keep all license comments at the top of the file
• JS: minify typeof x==='undefined' to typeof x=='undefined'
• JS: merge expressions and var declarations with for with empty initializer or with while statement converted to for
• JS: iteratively merge if(a){return b}if(c){return d}return e chains to return a?b:c?d:e