is.js 250 Bytes
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// Implementation credits go to:
// http://wiki.ecmascript.org/doku.php?id=harmony:egal

'use strict';

module.exports = function (x, y) {
	return (x === y) ?
			((x !== 0) || ((1 / x) === (1 / y))) :
			((x !== x) && (y !== y)); //jslint: ignore
};