readonly добавили, а nonenumerable забыли :)
https://github.com/microsoft/TypeScript/issues/9726
https://www.typescriptlang.org/play?#code/MYewdgzgLgBATgU2FAjDAvDAJiYBXAWwTCgDoAjELAT1IHMEoAhEPMLASzDoGEAbDsSgAlJFAAUASgDcAWABQoSLETIATBhgBvUrtWoAvnPkB6EzGABDMGBAqElrDAAOcEM4Rwo1GAAMoIADKUHBcdL4wIABmfmxYCFFcCFi+CkoQIHwIpHwgdOL6aqQAHqQBwaHcUjJAA
Post #113
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