No, I don't think it is a bug.
It is just like replace.
Just work on a copy of x:
y: uppercase copy x
And this is the same in the latest view beta I'm running.
Anton.
> >> x: "hello"
> == "hello"
> >> y: uppercase x
> == "HELLO"
> >> x
> == "HELLO" <====<<<< Why is x now uppercase?
>
> This is really unexpected behavior! Is this a bug?
>
> Is it like this in the new version of rebol (I haven't upgraded yet)?
>
> Louis
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