Can we enable -preview=rvaluereference now?

[Manu]

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?
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