enable preview=rvaluerefparam by default

[thewilsonator]

https://forum.dlang.org/thread/[email protected]

Will add changelog soon

[dlang-bot]

Thanks for your pull request and interest in making D better, @thewilsonator! We are looking forward to reviewing it, and you should be hearing from a maintainer soon.
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Testing this PR locally

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[thewilsonator]

Lolwot? I didn't close this.

[Geod24]

The gods of Github don't want this ;)

Wasn't it broken for most of its lifetime ? Quite curious what the CI will say.

[thewilsonator]

Wasn't it broken for most of its lifetime ?

Wasn't that noSharedAccess.

[tgehr]

I think this PR accidentally disables the feature for everyone.