Heh, I really do need to land int64/uint64 support. The patch needs tests and some cleanup first. This week may afford some hacking time (finally) instead of just rebasing time.
In theory it shouldn't be necessary to mal-invest in long-odds/single-vendor (and therefore hard to standardize without dominant market power) innovations at high cost, just to drive minimal investment in evolving the web in shorter-odds ways. Especially when the same company is collaborating in TC39 to evolve JS, and owns the V8 engine!