See bug 855130 comment 46 (first paragraph) and https://www.w3.org/Bugs/Public/show_bug.cgi?id=22432
So, there seems to be no need to do this. There's no potential for a race as the ArrayBuffer is copied to the internal input buffer synchronously during appendBuffer. I'll close the W3C bug too.
Status: NEW → RESOLVED
Last Resolved: 5 years ago
Resolution: --- → INVALID
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