About structs and performant handling

[Namespace]

> First, it introduce a new syntax, which is always a concern. It 
> add language complexity, and it likely to not be used 
> everywhere it should.
Yes, you're right. But I also said that the syntax does not 
matter.
My intention was to stimulate thinking about the real issue.
Even if "auto ref" will work someday for non-templates (we really 
need an official statement about that), then even small structs 
will be passed by ref. And that's still very ugly.