When to use typecons.proxy vs alias this?

[weaselcat via Digitalmars-d-learn]

On Sunday, 25 January 2015 at 03:55:18 UTC, Adam D. Ruppe wrote:
> Use alias this if you want implicit conversions too.
>
> Proxy keeps the types separate
>
> void foo(Base b) { }
>
> struct Modified {
>    Base b;
>    alias b this;
> }
>
> foo(Modified()); //works
>
>
> That wouldn't work if it was proxied though, which you 
> sometimes want to force everything to go through your 
> modification.

So the only difference is that proxy doesn't have implicit 
conversions? Hm. Might be worth pointing out on the docs.