broken minified code: v + "" == "x";

[jfgodoy]

Describe the bug There is a bug in the minification of the following code.

To Reproduce babel try it out

input

function compare(v) {
  return v + "" == "x";
}
compare(4) // false
compare('a') // false

Actual Output

function compare(a) {
  return a + "x";
}
compare(4) // '4x'
compare('a') // 'ax'

Expected Output don't minify this case

[zhangshichun]

yes!!!i have a same problem too!! how did u fix it ?