Styles build fails when using polyfill for Array

[zwug]

I have a polyfill for Array.includes from webpack-dev-server:

if (!Array.prototype.includes) {
  Array.prototype.includes = require('array-includes');
}

And my webpack build fails here because the property 'includes' is enumerable. I can make a pull request and replace for ... in loop with regular for(;;)

[alexander-akait]

Out of scope stylus-loader