Eliminate redundancy of dup/idup

[Andrej Mitrovic]

On 9/9/12, Adam D. Ruppe <destructionator at gmail.com> wrote:
> One option I've heard that might be OK is to make auto strip off
> the top level immutable:
>
> immutable(char[]) a;
> auto b = a; // b is immutable(char)[]

Sounds like something that could bite you in generic code if you
expect 'auto' to do nothing more than type inference. is() expressions
might start failing, etc..