IE11 Symbol Issue

In Internet Explorer 11 I get this error message when using the web components polyfill and lodash omitBy or pickBy.

```
Unable to get property '@@__
symbol:iterator0.93819982581614551' of undefined or null reference
````
This is not a duplicate of #43, though there are some similarities.

This has occurred with other polyfills as well:
- https://github.com/Financial-Times/polyfill-service/issues/1058
- https://github.com/zloirock/core-js/commit/78770786a4e5f2f87ea32b4dada46b9ce0a92887

Lodash similarly has blocked the issue on their end, I believe thinking that polyfills need to resolve the issue:
https://github.com/lodash/lodash/issues/2308

Some interesting things about reproduction:

----

**This one will fail with the above error:**

```html

var obj = {a: 1, b: 2}
var smaller = _.omitBy(obj, function (val) { return val > 1 })
console.log(smaller)

```

----

**This one works fine:**

```html

var obj = {a: 1, b: 2}
var smaller = _.omitBy(obj, function (val) { return val > 1 })
console.log(smaller)

```
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Does that just mean I'm using the wrong polyfill? My real use case is a complex webpack bundle thing with core-js and other, we first ran into #43 now this :)

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You can see it for yourself here:
https://jsfiddle.net/s8yzcjne/3/embedded/result,css,html,js