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readme.md
number-is-nan 
ES6
Number.isNaN()ponyfillPonyfill: A polyfill that doesn't overwrite the native method
Install
$ npm install --save number-is-nan
Usage
var numberIsNan = require('number-is-nan');
numberIsNan(NaN);
//=> true
numberIsNan('unicorn');
//=> false
License
MIT © Sindre Sorhus