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ECMAScript spec abstract operations.

There is a newer version: 1.22.3

'use strict';

var $isNaN = require('../helpers/isNaN');

// http://262.ecma-international.org/5.1/#sec-9.12

module.exports = function SameValue(x, y) {
	if (x === y) { // 0 === -0, but they are not identical.
		if (x === 0) { return 1 / x === 1 / y; }
		return true;
	}
	return $isNaN(x) && $isNaN(y);
};