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When a "length-tracking" TypedArray/DataView is postMessage'd, the view seen by the recipient should still be "length-tracking". However, this wasn't the case, because the actual length was serialized, as opposed to the JS::ByteLength, which includes the "auto" state to signal the presence of this "length-tracking" behavior. This fixes two subtests in... https://wpt.live/html/infrastructure/safe-passing-of-structured-data/messagechannel.any.html