[plt-scheme] Re: plt-scheme Digest, Vol 21, Issue 97

plt-scheme-request at list.cs.brown.edu wrote:

>  * Pairs will become immutable by default. This is the big change that
>    will break backward compatibility. We can provide a compatibility
>    `mzscheme' library, but we can't do that for all the libraries whose
>    public interface mentions lists.

This seems like a pretty big change.  Can I ask what the motivation is
here?  Would this change the r5rs (or whatever we're up to these days)
compatibility? 

 -tom

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