So this preview has been available for more than 5 years.

Andrei did a keynote on it, and that seemed generally well received (if not a little tepid, because not so many people care about this).

All the code I've written in the last 5 years doesn't work without this.

I have exercised this pretty extensively in whatever flavour of code it is that I tend to write, and never had any problem. It works like it's meant to.

I would severely struggle to return to a D without it.

Can we un-preview this now?