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- 'use strict';
- var create = Object.create, getPrototypeOf = Object.getPrototypeOf
- , x = {};
- module.exports = function (/*customCreate*/) {
- var setPrototypeOf = Object.setPrototypeOf
- , customCreate = arguments[0] || create;
- if (typeof setPrototypeOf !== 'function') return false;
- return getPrototypeOf(setPrototypeOf(customCreate(null), x)) === x;
- };
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