Re: [heycam/webidl] Throwing when converting detached ArrayBuffers is not what browsers do (#352)

> Is JavaScript now aligned with implementations on ArrayBuffer around this? I believe some folks still tried to make them throw for more things.

No. I thought we'd best remove any aspirational stuff at least for now, especially given the inconsistency.

> Also note that for the APIs you tested browsers might not use IDL's copying infrastructure since that's not the option that yields the best performance.

It's independent of the copy/reference; it should occur whenever converting a buffer source type to IDL, which happens before any algorithm steps.

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