Object.getOwnPropertySymbols()
Array.prototype.split()
Doctype
Object.defineProperty()
Array.prototype.reverse()
Object.setPrototypeOf()
Object.getPrototypeOf()
Array.prototype.findIndex()
Object.assign()
Object.getOwnPropertySymbols()
Array.prototype.shift()
Object.assign()
Object.is()
Object.freeze()
Object.seal()
