"But on the other, he tries to reassure that it's all already been taken into account.
However, Kosmos 482's parachute system, originally intended to slow the lander's descent towards Venus, is likely to have degraded after more than 50 years in space.
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writable: false means no code can reassign window.Audio to a different value. configurable: false means no code can even call Object.defineProperty again to change those settings. If fermaw’s initialisation code tried to restore the original Audio constructor (a perfectly sensible defensive move) the browser would either fail or throw a TypeError. The hook was permanent for the lifetime of the page.