On Sun, 12 Aug 2007 11:48:16 -0700, stephane ducasse  
<stephane.ducasse at free.fr> wrote:

> I browsed the archive from June to November looking for set, string
> and symbol. If someone has a better
> search engine I would be interested reading this thread.
>

I found it using "site:" with Google.

You can see a bit of it on:  
http://lists.squeakfoundation.org/pipermail/squeak-dev/1998-September/


Look for:

String/Symbol equality