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.
“Wasm + JS glue”: A WebAssembly function which reads the change list in a loop, and then asks JS glue code to apply each change individually. This is the performance of WebAssembly today.
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certain key fields (like account number and check number) represented in a newly
Фото: Кирилл Каллиников / РИА Новости