Extension/runtime code can't rely on arrays being iterable

[andreubotella]

delete Array.prototype[Symbol.iterator];

error: Uncaught TypeError: allMembers is not iterable
    at <anonymous> (deno:extensions/webidl/00_webidl.js:739:28)

The above code is all that's needed in a script to trigger this exception, no usage of arrays needed at all. The error is probably thrown when firing the load event; see also https://github.com/denoland/deno/issues/11677#issuecomment-898254299

[stale[bot]]

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