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ECMAScript spec abstract operations.

There is a newer version: 1.22.3

'use strict';

var Type = require('./Type');

// https://262.ecma-international.org/5.1/#sec-11.9.6

module.exports = function StrictEqualityComparison(x, y) {
	var xType = Type(x);
	var yType = Type(y);
	if (xType !== yType) {
		return false;
	}
	if (xType === 'Undefined' || xType === 'Null') {
		return true;
	}
	return x === y; // shortcut for steps 4-7
};