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In a code sample from the [Lifting State Up](https://github.com/facebook/react/blob/master/docs/docs/lifting-state-up.md) documentation, `Number.isNaN()` is used. Specifically in the [Writing Conversion Functions](https://facebook.github.io/react/docs/lifting-state-up.html#writing-conversion-functions) section (see the `tryConvert` function).
I'm following the Quick Start guide using [Visual Code](https://code.visualstudio.com/) 1.12.2 as editor with [create-react-app](https://github.com/facebookincubator/create-react-app). When using Internet Explorer 11 to test the `Calculator` component after completing the Lifting State Up section, I'm getting the following error:
> TypeError: Object doesn't support property or method 'isNaN'
This can be fixed when using reguler `isNaN()` in IE11, should the doc be updated to use this?