Re: [heycam/webidl] "get a copy of the bytes held by the buffer source" should not fail for detached buffers (#151)

test262 does include tests for this (thanks @leobalter) but I'm still concerned about web compatibility. I haven't figured out how to instrument TypedArrays to measure whether detached TypedArrays are ever accessed without decreasing TypedArray performance (we set the length to 0 and bounds checks handle accesses, so we don't need a separate detached check), so I'm not sure how to get the information from telemetry. Does anyone else have an idea for how to get solid data on this question?

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