[E-Lang] Immutable map operations

[by way of "Mark S. Miller" <markm@caplet.com>]

[forwarded by permission.  --MarkM]

 MarkM wrote:
>
> IMO, this entire direction isn't worth pursuing unless we give up on mutable 
> collections.  I see no way to retain mutable indexable collections without 
> retaining the security problem.

MarkM:

This is obviously very important to you, but I haven't yet grokked the security
issue.  Could you give me a URL or a summary or example?

Regards,

Zooko