IOS 10.2 Safari 10 fails on `Array.prototype.iterator` with `is not a function`

Safari 10 fails on [][Symbol.iterator]() with is not a function when es6 feature is included.

Effectively ES6 for (var key in []) transpiles to use array iterators. But if you include es6 feature, it breaks the native implementation (that worked before the polyfill). [][Symbol.iterator]() works without the polyfill, natively. If I do not import es6, which overwrites Symbol, it works.

[JakeChampion]

@bkniffler we already have that feature, it is listed on our api page. adding &flags=gated to the end of the polyfill.io url you are using will apply the gated flag to all features requested in the features parameter. gated adds a feature detect around every polyfill, meaning the polyfills will only execute if the feature detect decides the browser does not have that feature natively.

[jonashaag]

This is still an issue. To reproduce:

<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=default,Symbol,Symbol.iterator,Array.prototype.@@iterator"></script>
<script>
const a = [1,2,3]
const it = a[Symbol.iterator]()
let x
while((x = it.next(), !x.done)) {
  document.write("<div>" + x.value + "</div>")
}
</script>