Yeah it's weird. I remember hearing a lot about it a couple years back, and when SpiderMonkey implemented in Firefox it was a noticeable change, largely because we used to call one our hidden type structures "TypeObjects", and that was super confusing when there was a language construct called "TypedObjects", so we renamed our TypeObjects to "ObjectGroup".

Seemed like a really nice proposal for procedural construction of typed views into ArrayBuffers, and perplexing that talk of it seems to have died down...