Re: [whatwg/webidl] Add [AllowImmutable] extended attribute for immutable array buffers and views (Issue #1487)

bakkot left a comment (whatwg/webidl#1487)

I think the default should be to accept immutable buffers. Even for APIs which write to their argument (which are rare - TextEncoder encodeInto comes to mind, but little else) they'll just throw when they actually try to write.

It would be nice for APIs which do a copy to be updated not to do that, but this is an unobservable optimization which engines could do anyway, so it's not strictly necessary.

Maybe instead there should be a `[ForbidImmutable]` attribute for the those rare cases?

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